Curriculum: Pain Medicine and Analgesic Pharmacology
Subject: Curriculum: Pain Medicine and Analgesic Pharmacology
50 chapters
1. Learning Objectives
[Verse 1]
Dorsal horn receiving signals, let me break it down precise
Nociceptors fire when tissue damage cuts you like a vice
A-delta fibers, sharp and fast, they're thinly myelinated
C-fibers slow and burning — unmyelinated, concentrated
Transduction first, the stimulus converts to electrical flame
Transmission up the spinothalamic tract, that's where we stake our claim
Modulation happens mid-route — enkephalins intervene
Perception lands in cortex where the suffering convenes
Prostaglandins, bradykinin, substance P in the mix
Peripheral sensitization — that's the chemistry that sticks
[Chorus - French]
La douleur, on la classifie
Par mécanisme, durée, étiologie
Nociceptive, neuropathique, ou nociplastique aussi
Choisis ton médicament — c'est la pharmacologie
La douleur, on la maîtrise
Comprends la voie avant la dose, c'est la promesse précise
[Verse 2]
Now classify the pain or your prescription gonna miss
Nociceptive pain — tissue damage, inflammation's kiss
Somatic stays localized, you point right to the spot
Visceral is diffuse, cramping, twisting what you've got
NSAIDs and acetaminophen for that nociceptive lane
Opioids when it's visceral and severity's the main refrain
Neuropathic pain means damaged nerves are misfiring sparks
Gabapentinoids and tricyclics navigate those broken arcs
Burning, shooting, allodynia — touch that shouldn't hurt
Membrane stabilizers are the pharmacologic alert
[Bridge]
Here's your rare word — allodynia, that's when innocuous sensation
Like a feather on your forearm triggers pain beyond all calibration
And nociplastic — third type — central nervous system wound
Sensitized without clear tissue damage, processing malattuned
Duration splits to acute versus chronic — that's your temporal frame
Acute protects, it's warning you, but chronic's not the same
Etiology tells you cancer pain from surgical, from vascular
Matching mechanism to the molecule makes your treatment spectacular
[Chorus - French]
La douleur, on la classifie
Par mécanisme, durée, étiologie
Nociceptive, neuropathique, ou nociplastique aussi
Choisis ton médicament — c'est la pharmacologie
La douleur, on la maîtrise
Comprends la voie avant la dose, c'est la promesse précise
[Verse 3]
Descending inhibition — raphe nucleus drops serotonin low
Locus coeruleus releases norepinephrine in the flow
That's why SNRIs like duloxetine can quiet chronic pain
They amplify descending signals down the inhibitory chain
Gate control theory — large fibers close the gate on small
Dorsal horn interneurons regulating each signal's call
Opioid receptors — mu, kappa, delta — distributed wide
Endorphins are endogenous, your body's own analgesic guide
Wind-up phenomenon — repeated C-fiber stimulation grows
NMDA receptor activation, that's how central sensitization shows
Ketamine blocks that NMDA, interrupting the cascade
Understanding mechanism is the sharpest clinical blade
2. 1 Nociception and Pain Pathways
[Verse 1]
Skin meets stimulus, the story starts at the edge
Aδ and C fibers posted on the ledge
Aδ is myelinated, sharp and fast like a blade
C fiber unmyelinated, slow burn, second wave
TRPV1 opens when the capsaicin bites
Nav one-point-seven gates the sodium spike
Nav one-point-eight keeps the current alive
ASICs reading acid, telling cells to survive
Transduction, transmission — the periphery's alive
Converting thermal and mechanical into electrical drive
[Chorus]
El dolor tiene un camino, sube por la espina
Nociceptores firing, dorsal horn machina
A-delta, fibra C, canales que abren
Gate control, señales que se abren y caben
Wide dynamic range, the laminae know the score
El cuerpo tiene el antídoto — endogenous and more
[Verse 2]
Dorsal horn is where the signal hits the gate
Laminae one and two — substantia gelatinata
Wide-dynamic-range neurons stack the inputs up
Innocuous to noxious — they amplify the cup
Rexed laminae organized like floors in a tower
Each one processing signals, each one holding power
Glutamate and substance P flood the synaptic cleft
Wind-up phenomenon — the sensitivity is left
Gate control said interneurons hold the latch
Aβ fibers inhibit — Melzack and Wall's dispatch
Modern revisions add descending lanes on top
The gate ain't just mechanical — neurochemistry won't stop
[Chorus]
El dolor tiene un camino, sube por la espina
Nociceptores firing, dorsal horn machina
A-delta, fibra C, canales que abren
Gate control, señales que se abren y caben
Wide dynamic range, the laminae know the score
El cuerpo tiene el antídoto — endogenous and more
[Verse 3]
Spinothalamic tract running contralateral and clean
Crosses at the cord level, localization machine
Spinoreticular hits the brainstem, stirs the arousal
Spinomesencephalic — PAG gets the causal
Thalamus relays it to somatosensory cortex
Localizing pain with anatomical vortex
Insula encodes the interoceptive sting
Anterior cingulate carries the suffering
Prefrontal cortex colors it with meaning and dread
The pain matrix concept — debated but widespread
Critics say no region is specific to pain's call
It's a dynamic network — contextual, not a hall
[Bridge]
PAG to RVM — descendiendo la señal
Locus coeruleus dropping noradrenaline down the canal
Serotonergic pathways — dual-edged, can inhibit or excite
Endogenous opioids — enkephalin locking mu-receptor tight
Beta-endorphin, dynorphin — the pharmacy we own
Descending modulation means the brain edits what is shown
[Chorus]
El dolor tiene un camino, sube por la espina
Nociceptores firing, dorsal horn machina
A-delta, fibra C, canales que abren
Gate control, señales que se abren y caben
Wide dynamic range, the laminae know the score
El cuerpo tiene el antídoto — endogenous and more
[Outro]
Nociception isn't pain — perception takes a cortex
Sensation plus emotion plus cognition form the vortex
From TRPV1 to the prefrontal throne
El dolor es tuyo — but the pathway can be owned
3. 2 Sensitization and Chronification
[Verse 1]
Tissue damage drops the signal, inflammatory cascade flows
Prostaglandins flood the area, bradykinin starts to grow
Nerve growth factor binds the nociceptor, threshold drops below
Peripheral sensitization — your pain receptors on overdrive, bro
Cytokines from macrophages amplify the transduction game
COX-2 cranking prostaglandins, nothing feels the same
Primary hyperalgesia at the wound site, allodynia creeping in
That's the periphery talking loud before the central stuff begins
[Chorus]
Wind-up, LTP, NMDA keys unlock the gate
Glial cells screaming, sodium channels replicate
Ectopic firing, disinhibition — GABAergic brakes are gone
Nociplastic pain got no lesion but the signal still carries on
Peripheral, central, neuropathic — three lanes of sensitization
Chronification is the destination when acute becomes foundation
[Verse 2]
Now the dorsal horn is listening different, synaptic gain increased
Glutamate hammers NMDA, magnesium block released
Calcium flooding into neurons, kinase activation spreads
Long-term potentiation etching new pathways in your threads
Microglia and astrocytes join the amplification choir
Pro-inflammatory cytokines — IL-1, TNF — throw fuel in the fire
Wind-up means each repeated stimulus hits progressively harder
Central sensitization rewrites the map, pain volume getting larger
[Chorus]
Wind-up, LTP, NMDA keys unlock the gate
Glial cells screaming, sodium channels replicate
Ectopic firing, disinhibition — GABAergic brakes are gone
Nociplastic pain got no lesion but the signal still carries on
Peripheral, central, neuropathic — three lanes of sensitization
Chronification is the destination when acute becomes foundation
[Verse 3]
Neuropathic lane — the axon's damaged but still generating sparks
Nav one-point-seven upregulated, misfiring in the dark
Sympathetic fibers sprouting baskets round the DRG
Norepinephrine activating pain fibers — that ain't how it's supposed to be
Disinhibition knocks the interneurons out, descending control fails
Serotonin-norepinephrine balance tips and inhibition derails
Now meet nociplastic — fibromyalgia, IBS, chronic low back
No structural lesion found on imaging but the suffering is fact
[Bridge]
Acute goes chronic when catastrophizing meets genetic soil
Post-surgical pain, psychological distress, the transition starts to boil
Opioid-induced hyperalgesia — dynorphin spikes, NMDA wakes again
The drug meant to dull the signal paradoxically amplifies pain
Risk factors stack like comorbidities — depression, anxiety, fear-avoidance trap
Understanding chronification means rewriting the analgesic map
[Chorus]
Wind-up, LTP, NMDA keys unlock the gate
Glial cells screaming, sodium channels replicate
Ectopic firing, disinhibition — GABAergic brakes are gone
Nociplastic pain got no lesion but the signal still carries on
Peripheral, central, neuropathic — three lanes of sensitization
Chronification is the destination when acute becomes foundation
4. 3 Classification
[Verse 1]
IASP drew the lines, let's parse 'em clean
Nociception's just the signal, not the feeling in between
Neurons firing, transduction up the peripheral lane
But pain itself is the experience, emotional and plain
Allodynia hits when a feather feels like flame
Non-painful stimulus twisted in the brain's frame
Hyperalgesia cranks the volume way past ten
Hyperpathia's the echo that keeps burning after then
Dysesthesia — abnormal, spontaneous, unpleasant sensation
These ain't synonyms, each term's its own foundation
[Chorus]
Nociceptive, neuropathic, nociplastic — classify
Acute to chronic, three months is the dividing line
Cancer pain, non-cancer, breakthrough on the side
Primary or secondary, ICD-eleven's guide
Somatic sharp, visceral dull and hard to locate
Mixed pain's the puzzle when mechanisms conflate
[Verse 2]
Somatic pain got you pointing right at the spot
Localized, sharp, proportionate — you feel exactly what you got
Visceral's elusive, cramping deep inside the gut
Autonomic riding shotgun — nausea, sweating, the whole cut
Referred pain's the ventriloquist, throwing voice across the map
Cardiac ischemia screaming through the left arm's trap
The convergence theory explains that neural sleight of hand
Visceral afferents sharing real estate they never planned
Neuropathic pain — lesion in the somatosensory road
Central or peripheral, the system's in a broken mode
[Chorus]
Nociceptive, neuropathic, nociplastic — classify
Acute to chronic, three months is the dividing line
Cancer pain, non-cancer, breakthrough on the side
Primary or secondary, ICD-eleven's guide
Somatic sharp, visceral dull and hard to locate
Mixed pain's the puzzle when mechanisms conflate
[Verse 3]
Nociplastic — altered nociception with no tissue wreck
No nerve lesion proving it, but sensitization's checked
Central amplification running wild, gain turned up too loud
Fibromyalgia, widespread chronic pain — nociplastic crowd
Now temporal framing — acute's the fresh alarm
Subacute sitting six to twelve weeks working toward the calm
Chronic crosses ninety days, the three-month Rubicon
ICD-eleven splits it — primary stands alone
Secondary serves another pathology's throne
Six subtypes: cancer, post-surgical, musculoskeletal, visceral — known
[Bridge]
Breakthrough pain is episodic, spikes above the baseline tide
Incident pain has a trigger — movement, pressure, the outside
End-of-dose is pharmacokinetic, medication's ebbing side
Cancer pain weaves nociceptive, neuropathic nationwide
Non-cancer chronic is its own labyrinthine maze
Mixed pain demands we hold two mechanisms in our gaze
Here's a word for the lexicon — algogenic — meaning pain-producing
Every stimulus on this map is algogenic or seducing
5. 4 Psychology and Biopsychosocial Model
[Verse 1]
Fear-avoidance model — let's dissect it clean
Patient hurts their back, catastrophizes the scene
"This pain means damage," that's the misinterpretation
Hypervigilance kicks in, avoidance is the station
They stop the motion, muscles start to atrophy
Disability compounds — that's the catastrophe
Self-efficacy flipped — they don't believe they'll cope
Low perceived control tightens like a stethoscope
Kinesiophobia, Tampa Scale, we measure it
Central sensitization feeds the fear a separate kit
Cognitive distortion amplifies nociception
Reframe the narrative — that's the intervention
[Chorus]
Il dolore non è solo nel corpo, fratello
Bio-psico-sociale — è un modello bello
Fear, catastrophe, the social thread
Biopsychosocial — live inside your head
Sleep, mood, placebo — tutta la storia
Psychology of pain — questa è la gloria
[Verse 2]
Sleep disruption drops the descending inhibitory brake
Less GABA tone at night means more pain you intake
Bidirectionality — the arrow goes both ways
Pain fragments your sleep, poor sleep amplifies the blaze
Mood disorders share the circuitry, overlapping nodes
Serotonin, norepinephrine — running the same roads
Depression triples the odds of chronic pain persistence
Treating one without the other — that's clinical resistance
Screen with PHQ-9, ask about the rest they're getting
Integrated care closes gaps the siloed approach is letting
[Chorus]
Il dolore non è solo nel corpo, fratello
Bio-psico-sociale — è un modello bello
Fear, catastrophe, the social thread
Biopsychosocial — live inside your head
Sleep, mood, placebo — tutta la storia
Psychology of pain — questa è la gloria
[Bridge]
Placebo activates endogenous opioid release
Open-label still works — that's the neural masterpiece
Expectation shapes the anterior cingulate response
Nocebo flips it — negative words plant the nonce
Tell a patient "this will sting and probably scar"
You've primed the nervous system, raised the pain bar
Informed consent needs calibrated language, measured tone
Trial design controls for expectation — that's the throne
Condition your placebo arm with ritual and routine
Maximize the signal, keep the methodology clean
[Verse 3]
Social determinants — zip code predicts your dose
Low-income patients undertreated coast to coast
Structural inequity bends the pain trajectory
Race-based prescribing myths — that's clinical treachery
Culture shapes expression — stoic versus demonstrative
Neither one is pathologic, both are informative
Collectivist frameworks lean on family validation
Individualist models push toward self-regulation
Clinician bias filters what gets documented and heard
Disparity in opioid access hangs on a single word
Calibrate the assessment to the context of the patient
Cultural humility isn't optional — it's foundational
6. Self-Assessment
[Verse 1]
Burned fingertip, thermoreceptors scream awake
Nociceptors fire, transduction's what it takes
A delta fibers sprint — sharp, precise, immediate pain
C fibers crawl behind like a slow, sulfurous rain
Dorsal horn receives 'em, glutamate drops its key
Substance P unlocks the gate, signals running free
Spinothalamic tract ascending, crossing to the other side
Thalamus routes the signal, cortex where it's verified
Anterior cingulate screaming "this is suffering, feel it"
Somatosensory cortex maps the wound and seals it
Then descending modulation — PAG sends orders down
Serotonin, norepinephrine, dampen every sound
Opioid interneurons gate the dorsal horn transmission
That's the whole trajectory — nociception to remission
[Chorus]
Nociceptive — tissue damage, inflammation's game
Neuropathic — nerve dysfunction, aberrant signals trained
Nociplastic — no clear lesion but the CNS is changed
NMDA, ketamine, sensitization named
A-delta sprints, C-fibers stroll, thalamus routes the frame
Trace the signal, name the pain, treat it with your brain
[Verse 2]
Patient one: post-herpetic, burning like a branding coal
Allodynia from a bedsheet — that's a neuropathic toll
The nerve itself is damaged, ectopic discharge lit
Voltage-gated sodium channels misfiring every split
First-line options — gabapentinoids to calm the flux
Or tricyclics blocking reuptake, norepinephrine crux
SNRIs also valid, duloxetine's your call
For neuropathic — modulate the nerve signal at the wall
Patient two: fibromyalgia, no tissue breakdown found
Widespread hypersensitivity, pain without a wound
Nociplastic presentation — central processing gone awry
SNRIs and duloxetine still anchor your reply
Milnacipran's another tool, pregabalin fits the case
NSAIDs and opioids? They barely hold a place
[Chorus]
Nociceptive — tissue damage, inflammation's game
Neuropathic — nerve dysfunction, aberrant signals trained
Nociplastic — no clear lesion but the CNS is changed
NMDA, ketamine, sensitization named
A-delta sprints, C-fibers stroll, thalamus routes the frame
Trace the signal, name the pain, treat it with your brain
[Bridge]
Now let me introduce the receptor that refuses to hush
NMDA — voltage-gated, magnesium blocks the rush
Repetitive C-fiber firing pulls that magnesium plug
Calcium pours in ferociously, that's the central thug
Wind-up phenomenon — every signal amplified
PKC and CaMKII get phosphorylated wide
Long-term potentiation in the dorsal horn, entrenched
That's central sensitization — the efferent signal drenched
Ketamine — an antagonist, plugs the channel cold
Sub-anesthetic dosing interrupts the sensitized threshold
For chronic pain refractory, perioperative care
Ketamine's the scalpel cutting hyperalgesia bare
The word *hyperekplexia* lives adjacent — exaggerated startle
Central sensitization's cousin, both a neural snarl
7. Learning Objectives
[Verse 1]
Absorption, distribution, metabolism, elimination —
Four pillars holding up your dosing calculation
Volume of distribution tells you where the drug resides
Hydrophilic stays in plasma, lipophilic deep inside tissues
Half-life times point-six-nine divided by clearance rate
Miss that number, underdose, or you accumulate
Steady state hits after five half-lives in the vein
Front-load with a loading dose or wait — that's the clinical game
Opioids bind mu receptors, potency ain't the same as dose
Morphine six-glucuronide builds up when renal function's low
Fentanyl's a lipid lover, patches lag behind the blood
Context-sensitive half-time climbing when you stop a prolonged drip — understand
[Chorus]
ADME — Absorption, Distribution, Metabolism, Excretion
PK meets PD — concentration drives the action
EC-fifty is the target where effect hits halfway
CYP enzymes flipping switches — watch what drugs you stack today
ADME — know the curve, anticipate the reaction
Titrate tight, bioavailability in the equation
[Verse 2]
Now pharmacodynamics — effect versus concentration
Sigmoid Emax model, ceiling hits at saturation
NSAIDs block COX-2, prostaglandins cut the signal
Add a mu-agonist on top — synergy, not simple
Ketamine blocks NMDA, sub-anesthetic infusion
Prevents central sensitization — opioid-sparing conclusion
Gabapentinoids cap the alpha-two-delta calcium current
Sedation stacks with opioids — respiratory risk concurrent
Know your therapeutic index, narrow means watch closely
Methadone's QT prolongation — cardiac risk, dose slowly
Buprenorphine ceiling on respiratory suppression
But partial agonist at mu means ceiling on analgesia too — pay attention
[Chorus]
ADME — Absorption, Distribution, Metabolism, Excretion
PK meets PD — concentration drives the action
EC-fifty is the target where effect hits halfway
CYP enzymes flipping switches — watch what drugs you stack today
ADME — know the curve, anticipate the reaction
Titrate tight, bioavailability in the equation
[Bridge]
CYP3A4 metabolizes codeine? — Nah, that's wrong, flip it
CYP2D6 converts codeine to morphine — ultrarapid metabolizer rippin'
Ten-percent of Caucasians carry duplicated alleles
Ultra-metabolizers flooding plasma — toxicity reveals
Poor metabolizers get zero conversion, zero relief
Tramadol same pathway — genotype beneath the belief
Serotonin syndrome lurking when you stack tramadol with SNRIs
Linezolid, methylene blue — MAO inhibition flies
Drug-drug interactions multiply when polypharmacy expands
Check protein binding — warfarin displaced by NSAIDs, now it lands
Higher free fraction means higher effect, recalculate the plan
Hepatic extraction ratio — first-pass strips the bioavailability, man
8. 1 Pharmacokinetics
[Verse 1]
Swallow that morphine, hit the gut, get absorbed slow
Bioavailability low, bout thirty percent though
First-pass metabolism tearing through the portal vein
Liver chops it up before it ever hits the brain
Immediate release spikes fast, modified release stays flat
Formulation matters, write that pharmacology fact
Transdermal fentanyl depot building in the skin
Transmucosal hits the bloodstream, bypasses first-pass then
Food can slow absorption, fatty meals delay the peak
Context shapes the kinetics every single time you speak
[Chorus]
Two-D-six and three-A-four, UGT-two-B-seven
Active metabolites determining what the patient's getting
Vd and protein binding, lipophilicity key
Fentanyl dissolves in fat, morphine stays more free
Half-life, steady state, accumulation runs the game
Linear or nonlinear — the dose-exposure ain't the same
[Verse 2]
Distribution, talk volume — spread across the tissues wide
Fentanyl got crazy lipophilicity, crosses every divide
High Vd means it's hiding deep in fat and muscle stores
Morphine stays more hydrophilic, smaller Vd scores
Protein binding — albumin grabs acidic drugs up tight
Alpha-one glycoprotein holds the basics overnight
Blood-brain barrier's the gatekeeper, P-glycoprotein pump
Kicks opioids right back out, efflux over the hump
That's why CNS penetration varies drug to drug
Lipophilicity the skeleton key turning in that lock
[Chorus]
Two-D-six and three-A-four, UGT-two-B-seven
Active metabolites determining what the patient's getting
Vd and protein binding, lipophilicity key
Fentanyl dissolves in fat, morphine stays more free
Half-life, steady state, accumulation runs the game
Linear or nonlinear — the dose-exposure ain't the same
[Verse 3]
Now metabolism — CYP enzymes on the clock
Two-D-six converts codeine and tramadol to the shock
O-desmethyltramadol is the active compound there
Poor metabolizers get no relief, ultra-rapid beware
Three-A-four handles fentanyl, methadone in the queue
CYP-two-C-nine working NSAIDs all the way through
UGT-two-B-seven glucuronidates morphine at the six
Morphine-six-glucuronide potent — that's the analgesic fix
Morphine-three-glucuronide? Neuroexcitatory, watch for that
Normeperidine from meperidine causes seizures, fact
[Bridge]
Infusion running hours long, context-sensitive half-time climbs
Fentanyl accumulates, remifentanil declines
Renal clearance matters when the metabolites stack
M-six-G builds up in failure, hits the patient hard back
Loading dose fills the volume fast so plasma levels rise
Maintenance keeps it steady — five half-lives til you stabilize
Nonlinear kinetics, saturation at the enzyme seat
Methadone's the wild card — unpredictable defeat
9. 2 Pharmacodynamics
[Verse 1]
Affinity is how tight a drug grips the receptor site
Efficacy is whether that grip ignites the light — no wait, scratch that —
Efficacy determines if the protein shifts and signals right
Full agonist maxes out the ceiling, climbing to the height
Partial agonist like buprenorphine, different animal tonight
It binds with iron affinity but caps the ceiling tight
So at high doses it won't budge — intrinsic activity slight
Biased agonism means the downstream pathway splits the flow
G-protein versus beta-arrestin, choosing which way signals go
Inverse agonist flips the baseline, dips below the zero zone
It's not just blocking — it's reversing constitutive tone
[Chorus]
Affinity, efficacy, ceiling or no ceiling
Partial agonist buprenorphine — cap that signal's feeling
Dose-response curve, therapeutic index wide or thin
Tolerance shifts the EC-fifty, gotta titrate again
Pharmacodynamic, pharmacokinetic — two different sins
Synergy compounds the math — isobologram wins
[Verse 2]
Now draw the dose-response curve, sigmoid, log-scale on the axis
ED-fifty is the midpoint, toxic dose is what contrasts it
Therapeutic index: TD-fifty over ED-fifty — that's the fraction
NSAIDs got a ceiling — cox inhibition maxes, no more traction
Acetaminophen plateaus too, heap more doses just add liver fractures
Full mu-agonist morphine? Curve keeps climbing through the rafters
No ceiling on analgesia — but respiratory depression drafts up faster
That's why the index matters, gotta balance every chapter
[Chorus]
Affinity, efficacy, ceiling or no ceiling
Partial agonist buprenorphine — cap that signal's feeling
Dose-response curve, therapeutic index wide or thin
Tolerance shifts the EC-fifty, gotta titrate again
Pharmacodynamic, pharmacokinetic — two different sins
Synergy compounds the math — isobologram wins
[Verse 3]
Pharmacokinetic tolerance — induction of the CYP enzymes churning
Metabolize the drug too fast, plasma concentration dropping, turning
Pharmacodynamic tolerance — receptors internalize, stop returning
Downregulate the mu receptor density, signal not discerning
Tachyphylaxis hits rapid — hours not weeks of receptor spurning
Incomplete cross-tolerance means rotation's worth pursuing
Switch the opioid, recalibrate — receptors start renewing
Different binding signatures, the old ghost don't haunt the new king
[Bridge]
Physical dependence — neurons adapted to the molecule's presence
Remove it cold, withdrawal — that's physiology, not moral essence
Addiction — compulsive use despite the consequence, a different sentence
Pseudoaddiction — undertreated pain mimics drug-seeking in its cadence
But critics say that label gets misused to dismiss the patient
Check the context before you slap the stigma on the statement
10. 3 Pharmacogenomics
[Verse 1]
Prescribe codeine to the wrong patient, watch it go south
Pro-drug sitting dormant 'til CYP2D6 steps out
Poor metabolizer — enzyme barely shows its face
Codeine stacks up toxic, opioid stays in place
No morphine conversion, patient gets no pain relief
Or ultrarapid metabolizer — now that's the real grief
Six copies of the gene, metabolism so extreme
Infant nursing case, maternal codeine, fatal scene
CPIC guidelines posted on the wall
Ultrarapid plus codeine? Don't prescribe at all
[Chorus]
Two-D-six is the gatekeeper, read the phenotype
Poor, intermediate, normal, ultrarapid — get it right
Codeine, tramadol, hydrocodone running through the gate
Wrong metabolizer status means you're sealing someone's fate
Check the genome before you write, don't prescribe blind
Pharmacogenomics — the prescription's in the find
[Verse 2]
Tramadol need that same enzyme to make O-desmethyl
Ultrarapid converts excess, CNS goes to the devil
Seizure threshold dropping, serotonin syndrome creeping in
Intermediate metabolizer — therapeutic window thin
Hydrocodone likewise — CYP2D6 activation
Insufficient analgesia hits the poor metabolizer nation
CPIC says alternatives when the phenotype won't cooperate
Non-codeine opioids for the poor — that's how you navigate
Genotyping ain't guesswork, it's precision on the page
Molecular evidence directing every dosage stage
[Chorus]
Two-D-six is the gatekeeper, read the phenotype
Poor, intermediate, normal, ultrarapid — get it right
Codeine, tramadol, hydrocodone running through the gate
Wrong metabolizer status means you're sealing someone's fate
Check the genome before you write, don't prescribe blind
Pharmacogenomics — the prescription's in the find
[Verse 3]
Now OPRM1 A118G variant, mu receptor gene
Higher opioid requirements, blunted morphine scene
COMT val158met affects catechol degradation rate
Pain catastrophizing, emotional processing, modulate
ABCB1 encodes P-glycoprotein at the blood-brain fence
Variant changes CNS opioid penetrance
Clinical utility still debated, evidence limited right now
But population variability? That's the real know-how
African descent, Asian, European — allele frequencies shift
Ethnic background shapes the pharmacokineticrift
[Bridge]
HLA-B asterisk fifteen-zero-two
Southeast Asian ancestry, carbamazepine — what it do?
Stevens-Johnson syndrome, toxic epidermal wrecking
FDA says test before prescribing — no second-guessing
Han Chinese, Thai, Malaysian population screen
Hypersensitivity written in the HLA machine
Genetic testing indications: high-risk ethnicity
Polypharmacy complexity, pediatric safety decree
[Chorus]
Two-D-six is the gatekeeper, read the phenotype
Poor, intermediate, normal, ultrarapid — get it right
Codeine, tramadol, hydrocodone running through the gate
Wrong metabolizer status means you're sealing someone's fate
Check the genome before you write, don't prescribe blind
Pharmacogenomics — the prescription's in the find
11. 4 Drug Interactions
[Verse 1]
Azoles and macrolides, they throttle CYP three-four
Inhibit the enzyme, opioids stack up more
Fluconazole creeping, methadone levels soar
Rifampin's an inducer, strips the plasma to the floor
Carbamazepine, St. John's wort — induction in disguise
Fentanyl and oxycodone metabolized and gone — surprise
The substrate drug don't know the enzyme's been rewritten
You prescribe a standard dose and now the patient's smitten
With toxicity or failure — both extremes will leave you bitten
[Chorus]
CYP, QT, serotonin catastrophe
CNS depression, additive opacity
NSAID bleeding, acetaminophen and warfarin's synergy
Pharmacokinetic treachery — memorize the pedigree
CYP, QT, check every drug you write
Interactions ambuscade you in the pharmacology fight
Ambuscade — an ambush lying hidden in the weeds
Know the mechanism cold before a patient bleeds
[Verse 2]
Tramadol and SSRIs — serotonin starts to flood
Meperidine plus MAOIs, agitation in the blood
Tremors, hyperthermia, myoclonus in the mix
Linezolid's a MAOI, weak but still it kicks
Methadone and fentanyl got serotonergic pull
Add an SNRI on top and now the synapse is too full
Hunter criteria: clonus, diaphoresis, the shakes
One wrong combination and the hypothalamus breaks
Autonomic conflagration — that's the syndrome that it makes
[Chorus]
CYP, QT, serotonin catastrophe
CNS depression, additive opacity
NSAID bleeding, acetaminophen and warfarin's synergy
Pharmacokinetic treachery — memorize the pedigree
CYP, QT, check every drug you write
Interactions ambuscade you in the pharmacology fight
[Verse 3]
Benzodiazepines plus gabapentin — respiratory debt
Z-drugs, antihistamines, opioids — a suffocating net
Every CNS depressant stacks the apnea toll
Alcohol compounds the sediment inside your brainstem's soul
QT prolongation — methadone stretches out the wave
Ondansetron plus antipsychotics digging torsades' grave
Macrolides extend it too — azithromycin's quiet cost
ECG before you dose, or cardiac rhythm's lost
Prolonged QT, torsades de pointes — ventricular tempest tossed
[Bridge]
NSAIDs block prostaglandins in the kidney's soft terrain
Anticoagulants plus NSAIDs — GI hemorrhage is the refrain
Lithium rises, methotrexate lingers in the marrow deep
Antihypertensive blunting — pressure climbing while you sleep
SSRIs with NSAIDs — platelet aggregation stripped
Acetaminophen and warfarin — INR gets quietly flipped
Enzyme inducers shred the Tylenol, glucuronidation lost
Hepatotoxic metabolite — NAPQI counts the cost
Alcohol depletes glutathione — pay the oxidative frost
[Chorus]
CYP, QT, serotonin catastrophe
CNS depression, additive opacity
NSAID bleeding, acetaminophen and warfarin's synergy
Pharmacokinetic treachery — memorize the pedigree
CYP, QT, check every drug you write
Interactions ambuscade you in the pharmacology fight
12. 5 Dosing Concepts
[Verse 1]
Aight, pull up to the bedside, patient writhing in pain
Severe acute onset, can't afford to play games
Start-low-go-slow for chronic titration, that's true
But severe acute fracture? Adequate dosing is due
Don't undertreate a seven-out-of-ten just to feel safe
Timid dosing in acute crisis is a clinical disgrace
Titrate to effect, reassess, watch the vital signs shift
Match the dosing to the moment — that's a pharmacist's gift
[Chorus]
Five concepts, lock 'em in, let the knowledge resonate
Titrate, convert, adjust — don't just approximate
Fixed-interval keeps the trough from bottoming out
Weight-based, renal, hepatic — that's what precision's about
Equianalgesic tables — read 'em, but interrogate
Cross-tolerance incomplete — always downward calibrate
Five concepts, lock 'em in, the dose controls the fate
[Verse 2]
As-needed dosing leaves the patient chasing the pain
Breakthrough fire already burning by the time they complain
Around-the-clock regimens keep the plasma level steady
Fixed-interval dosing means the analgesia's ready
PRN has its place — procedural, breakthrough, acute
But chronic pain on demand? That's a subtherapeutic route
Trough levels tank, the signal spikes, the nervous system resets
Schedule the dose before the hurt — that's how you minimize regrets
[Chorus]
Five concepts, lock 'em in, let the knowledge resonate
Titrate, convert, adjust — don't just approximate
Fixed-interval keeps the trough from bottoming out
Weight-based, renal, hepatic — that's what precision's about
Equianalgesic tables — read 'em, but interrogate
Cross-tolerance incomplete — always downward calibrate
Five concepts, lock 'em in, the dose controls the fate
[Verse 3]
Body surface area for the pediatric and onco case
Ideal body weight when adipose tissue distorts the space
Obese patient on opioids — total body weight misleads
Lean mass drives the clearance — dose to the physiology, not the creed
Creatinine creeping upward — morphine-six-glucuronide stacks
Renal failure accumulates the metabolite, and it attacks
Hepatic impairment — first-pass gutted, bioavailability soars
Cut the dose, extend the interval, mind the coagulopathic scores
[Bridge]
Now therapeutic monitoring — analgesics rarely need the serum drawn
But adjuvants like carbamazepine demand you check the concentration, son
Lithium for neuropathic overlap, valproate for the migraine prophylaxis run
Monitor the trough, stay inside the therapeutic fenestration
— that's a word for optimal range, not over or under the station
13. Self-Assessment
[Verse 1]
Codeine rolls in thinking it's a player on the block
But CYP2D6 determines if it ever clocks
Poor metabolizers get a sugar pill effect
Ultra-rapid converters hit a toxic intercept
Ten percent of the population converts fast and mean
Morphine floods the system from the codeine in between
Neonates have died, nursing mothers didn't know
The FDA restriction came because the data said so
Genetic roulette table, every patient spinning fate
You prescribe the same milligrams, the outcome's never straight
[Chorus]
C-Y-P-2-D-6, it's the enzyme running tricks
Codeine needs conversion but the variation sticks
Renal failure, rotate right, check the metabolites
Five steps to a safe rotation, do the safety checks tonight
Fentanyl and methadone clear when kidneys quit the game
Morphine-six-glucuronide will stack and cause you pain
[Verse 2]
Kidney function fading, now you gotta shift your game
Morphine leaves a metabolite, M6G is its name
Accumulates in renal failure, respiratory hit
Hydromorphone's H3G builds neuroexcitatory grit
Meperidine breaks to normeperidine, that's the seizure seed
Avoid those three when creatinine clearance drops with speed
Fentanyl stays lipid-soluble, hepatic metabolism clear
Methadone conjugates the liver route, no renal fear
When the glomerulus gives out, your analgesic roster shifts
Fentanyl and methadone patch — those are the kidney gifts
[Chorus]
C-Y-P-2-D-6, it's the enzyme running tricks
Codeine needs conversion but the variation sticks
Renal failure, rotate right, check the metabolites
Five steps to a safe rotation, do the safety checks tonight
Fentanyl and methadone clear when kidneys quit the game
Morphine-six-glucuronide will stack and cause you pain
[Verse 3]
Opioid rotation — patient's tolerant but side effects are rough
Step one, calculate the equianalgesic dose, do the math that's tough
Step two, reduce by twenty-five to fifty percent
Incomplete cross-tolerance means the new drug hits different, evident
Step three, assess the patient — pain, sedation, vitals clean
Step four, divide the daily dose across a proper dosing scheme
Step five, write breakthrough orders, ten percent of total daily
Monitor the first twenty-four hours, reassess it daily
Never switch milligram to milligram like a lazy substitution
Incomplete cross-tolerance demands that dose reduction
[Bridge]
Equianalgesic tables are a compass, not a law
Methadone conversions shift with dose and need a closer draw
High-dose morphine-equivalent converts at a steeper rate
Consult palliative specialists before you estimate
Document the reason for rotation, note what failed before
Track the adverse effects you're escaping at the door
14. Learning Objectives
[Verse 1]
Step into the clinic, patient's hurting at the door
Can't just eyeball suffering, gotta dig in deeper for
The full topography of pain — where it lives, how deep it goes
Onset, quality, radiation, what relieves it or it grows
Pull out SOCRATES like a scalpel — Site, Onset, Character too
Radiation, Associated symptoms, Timing, Exacerbating view
Severity is next, then where it goes — the mnemonic holds the thread
NRS, VAS, Wong-Baker FACES — pick the tool to match the bed
Neuropathic or nociceptive, visceral or somatic grain
DN4 questionnaire catches burning, shooting, electric pain
Don't skip functional status — ask what living costs them now
ADLs disrupted, sleep demolished, mood dragged through the plow
[Chorus]
SOCRATES and ORT — tattoo 'em in your mind
Assess before you prescribe, don't leave the risk behind
Numerical, behavioral — match the tool to who you're treating
Pain has got a fingerprint, and vague answers keep repeating
Screen it, scale it, stratify — the data tells the tale
Comprehensive beats a hunch every single clinical scale
[Verse 2]
Now pivot to the opioid question — this is where docs hesitate
Risk assessment isn't judgment, it's the science of the straight
ORT — Opioid Risk Tool — five domains on a single page
Family and personal substance history, psych diagnosis, age
Sexual abuse history documented, prior drug behaviors logged
Scores below four, moderate four through seven, high above eight — catalogued
DIRE scale cross-references diagnosis, intractability and compliance
PDMP queries — pull the prescription database, apply the science
Aberrant behaviors aren't always addiction, document the context clear
Pseudoaddiction from undertreated pain can mimic what you fear
[Chorus]
SOCRATES and ORT — tattoo 'em in your mind
Assess before you prescribe, don't leave the risk behind
Numerical, behavioral — match the tool to who you're treating
Pain has got a fingerprint, and vague answers keep repeating
Screen it, scale it, stratify — the data tells the tale
Comprehensive beats a hunch every single clinical scale
[Bridge]
Here's a rare word — algometry — the science of measuring pain thresholds with precision
Pressure applied until sensation spikes, quantifying the body's sensitized condition
Central sensitization changes everything — peripheral input ain't the whole equation
Wind-up neurons firing hot, the nervous system warped by prolonged irritation
Universal precautions in opioid prescribing — treat the risk in everyone
Not just flagging certain patients, run the protocol till assessment's done
15. 1 History and Examination
[Verse 1]
Pull up to the bedside, clipboard in my grip
PQRST tattooed on my fingertip
Provocation, Quality, Region, Severity
Timing tells the story with total clarity
Oldcarts rolling — Onset, Location, Duration
Character of pain, Aggravating causation
Relieving factors, Timing, and the S is Signs
Associated symptoms threading through the lines
Patient keeps a diary, maps it day by day
Functional goals matter — what they need to say
Not just "kill the pain" but "coach my daughter's team"
Understand the context, understand the dream
[Chorus]
PQRST and OLDCARTS, map the pain terrain
Sensory, psychosocial, red flags in your brain
Allodynia, mood, the sleep, the job, the dread
Examine every axis — body, soul, and thread
PQRST and OLDCARTS, never skip a part
History and examination — that's the whole art
[Verse 2]
Now we're in the neuro lane, neuropathic case
Sensory mapping on the dermatomal space
Cotton wool for light touch, pin for sharp sensation
Thermal threshold testing — hot and cold gradation
Allodynia presents when a breeze becomes a blade
Gentle brush on skin that screams — the nervous system frayed
Quantitative sensory testing, QST protocol
Measures thermal and mechanical across the pain threshold wall
Hyperalgesia, wind-up, central sensitization
Map the aberrant wiring, document the deviation
[Chorus]
PQRST and OLDCARTS, map the pain terrain
Sensory, psychosocial, red flags in your brain
Allodynia, mood, the sleep, the job, the dread
Examine every axis — body, soul, and thread
PQRST and OLDCARTS, never skip a part
History and examination — that's the whole art
[Verse 3]
Musculoskeletal exam — palpate, load, and range
Visceral referred pain got a pattern, ain't it strange
Right shoulder ache could be the diaphragm's complaint
Rebound, guarding, rigidity — that visceral taint
Now the red flags waving — malignancy in bone
Night sweats, weight loss, age over fifty, pain that's grown
Cauda equina screaming — saddle numb and bladder fails
Fever, IV drug use — infection on the rails
Aortic pathology — tearing pain that radiates
Fracture after minor trauma — osteoporosis waits
Palliate nothing till you've cleared the sinister cause
The red flag doctrine written straight into your laws
[Bridge]
Here's a word the lexicon keeps fugacious — fleeting, hard to catch
Psychosocial factors fading fast unless you snatch
Mood disorders lurking, PHQ nine on the table
Sleep disrupted nightly, barely functional, barely stable
Trauma history coiled like a spring beneath the floor
Substance use — opioid misuse? Screen before you pour
Social scaffold — isolation amplifies the ache
Work status, compensation — all of that's at stake
The soma and the psyche locked in crosstalk, not discrete
Miss the biopsychosocial and your workup's incomplete
16. 2 Measurement Tools
[Verse 1]
Clinic floor, patient's hurting, gotta quantify the pain
Pull out your toolkit, run the numbers, let me explain
Unidimensional first — keep it clean and quick
NRS zero to ten, circle where it sticks
VAS is a line, patient marks the spot
Verbal rating scale — mild, moderate, a lot
Faces scale for kids who can't articulate the ache
Wong-Baker grins to grimaces, no language skills it takes
[Chorus]
Misurare il dolore — measure what they feel
Strumenti nel sangue — tools that make it real
NRS, VAS, BPI, McGill
DN4, PAINAD, RASS — we got the skill
Misurare il dolore — no guessing in this game
Every scale's a different lens to frame the patient's pain
[Verse 2]
Go multidimensional when one number won't do
Brief Pain Inventory maps severity and function too
McGill Pain Questionnaire — sensory, affective, evaluative lines
PEG scale — pain, enjoyment, general activity defines
Neuropathic screening, gotta catch that burning nerve
DN4, LANSS, painDETECT — watch the features curve
Shooting, electric, tingling, numbness in the skin
Positive screen means neuropathic pathways might begin
[Chorus]
Misurare il dolore — measure what they feel
Strumenti nel sangue — tools that make it real
NRS, VAS, BPI, McGill
DN4, PAINAD, RASS — we got the skill
Misurare il dolore — no guessing in this game
Every scale's a different lens to frame the patient's pain
[Verse 3]
Function and quality of life — Oswestry for the spine
Roland-Morris disability, twenty-four-item design
PROMIS computerized adaptive, SF-36 goes wide
Psychological dimensions riding right beside
PHQ-9 catches depression underneath the ache
GAD-7 for anxiety keeping patients awake
Pain Catastrophizing Scale — magnification, rumination
Tampa Scale of Kinesiophobia — fear of re-aggravation
[Bridge]
Non-verbal patients still deserve precision —
PAINAD for dementia, CPOT in the ICU incision
FLACC for pediatrics, Abbey for the aged hall
Neonatal NIPS and PIPP — we measure for them all
Opioids on board? Then POSS and RASS you track —
Pasero sedation levels, Richmond brings you back
Strumenti diversi — la cura nel dettaglio
Each tool a different weapon in the clinical battaglia
[Verse 4]
Advanced learner, don't just pick one scale and walk away
Match the tool to context — that's the discipline at play
Cognitively intact adult, NRS in the chair
Ventilated ICU patient, CPOT's the call right there
Neonatal premature birth, PIPP tracks the cue
Chronic low back function loss, Oswestry sees it through
Psychological overlay needs PHQ and PCS combined
Comprehensive pain assessment means leaving none behind
[Chorus]
Misurare il dolore — measure what they feel
Strumenti nel sangue — tools that make it real
NRS, VAS, BPI, McGill
DN4, PAINAD, RASS — we got the skill
Misurare il dolore — no guessing in this game
Every scale's a different lens to frame the patient's pain
17. 3 Opioid Risk Assessment
[Verse 1]
Pull up to the clinic, got a patient on the table
Chronic pain is real but the risk ain't always stable
Before you write that script you gotta measure what you're facin'
ORT or SOAPP-R gonna start the conversation
Opioid Risk Tool — five domains, score it clean
Family history, personal use, age, psych, and what abuse means
Low risk zero to three, moderate hits four to seven
Eight and above, that's high risk, recalibrate your heaven
SOAPP-R got twenty-four items, self-report extended
DIRE score for primary care, resources and intended
COMM watch for aberrant behavior while they're on the medicine
Every tool's a different lens, combine 'em, don't be questioning
[Chorus]
Check the PDMP, check the urine cup
Immunoassay screens, confirmatory backs it up
ORT, SOAPP, DIRE — score before you sign
Naloxone co-prescribe when the risk starts to climb
False positive, false negative — don't read it blind
Metabolite cascades gonna blow your mind
Dose, co-prescriptions, apnea, renal decline
Assess the risk or cross that patient-safety line
[Verse 2]
Log into the PDMP before you even touch that pad
Multiple prescribers, pharmacy hopping — that's flagged bad
Now the urine cup arrives, immunoassay's the gate
Cheap and fast but antibody cross-reactions make mistakes
Quinolones fake positive opiates, poppy seeds too
Rifampin flips morphine screens — the chemistry will fool you
Confirmatory testing — mass spec don't lie
Quantify the molecule, identify with precision high
Expected metabolite absent? Patient's not compliant
Unexpected compound present? Time for an alliance
Codeine metabolizes morphine — that's a normal trail
Hydromorphone from hydrocodone at low levels, not betrayal
[Chorus]
Check the PDMP, check the urine cup
Immunoassay screens, confirmatory backs it up
ORT, SOAPP, DIRE — score before you sign
Naloxone co-prescribe when the risk starts to climb
False positive, false negative — don't read it blind
Metabolite cascades gonna blow your mind
Dose, co-prescriptions, apnea, renal decline
Assess the risk or cross that patient-safety line
[Verse 3]
Now let's catalog the overdose risk, engrave it in your skull
High morphine milligram equivalents — that bucket stays full
Ninety MME daily doubles down the danger zone
Benzos plus opioids — respiratory arrest alone
Sleep apnea unmanaged, oxygenation already thin
Add an opioid on top of that, hypoxia seeping in
Renal disease stacks active metabolites sky-tall
Hepatic failure wrecks the CYP, clearance starts to crawl
Prior overdose the single loudest signal screaming red
Mental illness, substance use disorder — factor in what's said
Co-occurring buprenorphine doesn't cancel out the threat
Stratify every visit — risk ain't static, don't forget
18. 4 Monitoring Over Time
[Verse 1]
Chronic pain management, it ain't a set-it-and-forget-it game
Every follow-up visit gotta document the change
Pull up the chart, we running through the five A's today
Analgesia first — how much that pain been washed away
Activities of daily life, can they function, can they move
Or are they frozen like before, we need to see improvement
Adverse effects lurking — constipation, sedation, nausea too
You prescribing harm alongside help, that math is on you
Aberrant behaviors — watch for early warning signs
Requesting early refills, multiple pharmacies combined
And affect, the fifth A, mental health inside the equation
Depression riding shotgun on a chronic pain vacation
[Chorus]
Five A's, monitor over time
Analgesia, Activities, keep the Adverse in mind
Aberrant behavior, then Affect — run the line
Document benefit versus harm every single time
Reassess acute in days, chronic every three months or so
When the risk outweighs the remedy, you gotta let it go
Informed consent ain't paperwork, it's a covenant you sign
Five A's, monitor, refine
[Verse 2]
Treatment agreements, some folks call 'em pain contracts, yeah
Informed consent means laying out the facts exact
Risks of dependence, overdose, hyperalgesia too —
That's where the opioids paradoxically amplify what they're supposed to subdue
Aberrancy thresholds, define 'em before you ever prescribe
So when behavior shifts, you ain't surprised, you got receipts alive
Urine tox screens, pill counts, prescription drug monitoring boards
These are the instruments of vigilance, sharper than any sword
Acute therapy reassessed in days, not weeks, not months
Reassessment intervals matter — don't let the urgency run blunt
[Chorus]
Five A's, monitor over time
Analgesia, Activities, keep the Adverse in mind
Aberrant behavior, then Affect — run the line
Document benefit versus harm every single time
Reassess acute in days, chronic every three months or so
When the risk outweighs the remedy, you gotta let it go
Informed consent ain't paperwork, it's a covenant you sign
Five A's, monitor, refine
[Bridge]
Here's a rare word for your lexicon — iatrogenic
Harm caused by the healer's hand, that's the meaning, be specific
When the cure creates the wound, documentation is your shield
Every note you write becomes the record of a battlefield
Define your stopping rules before the therapy begins
Dose escalating, function flat — that's where the harm wins
Benefit gotta outpace burden, that's the calculus of care
If the scale tips toward damage, you documenting why you're still in there
19. Self-Assessment
[Verse 1]
Eighty-two years old, hip snapped like a dry twig,
Post-op, confused, eyes wide, brain doing a jig,
Can't self-report the pain, delirium's got the wheel,
So we pull out PAINAD, let the behavioral cues reveal —
Facial grimace, rigid posture, vocalization sounds,
Five domains, scored zero-to-two, that's how we make the rounds,
CPOT for the ventilated, nonverbal is the art,
Reading bodies like a language when the patient can't impart
Now pivot — six years old, sickle cell's a storm inside the bone,
Vaso-occlusive crisis hits, he's crying, scared, alone,
Too young for numeric scales, abstractions fall apart,
So we hand him the Wong-Baker Faces, let him point to what his heart
Communicates — six little faces, zero through ten,
Or FLACC if he won't talk — Face, Legs, Activity, Cry, Consolability then,
Different tools for different minds, one-size fits none at all,
Know your patient, match your measure, that's the clinical protocol
[Chorus]
PAINAD for the elder lost in fog,
FLACC for the child, Wong-Baker for the dialogue,
Structured risk before the opioids flow,
UDS positive? Metabolites — you gotta know
ASSESS before you prescribe, interpret what you see,
ORT, DIRE, PDMP — that's the pharmacology
[Verse 2]
Now here's a puzzle wrapped in chemistry and doubt —
Patient's on hydromorphone, but the urine screen comes out
Positive for morphine — hold up, is this a violation?
Pump the brakes, pull the pharmacokinetics, do the calculation,
Hydromorphone metabolizes — norhydromorphone, that's expected,
But morphine ain't a downstream product, that connection's disconnected,
So morphine in the urine means one thing, crystal clear —
An outside source, undisclosed use — the conversation's here
But don't jump to termination, that's a lazy clinician's move,
Document the finding, have the structured talk, stay in the groove,
Codeine converts to morphine — did they take grandma's pill?
Poppy seeds are folklore, but the enzyme CYP's real,
Two-D-six polymorphism? Ultra-rapid metabolizer?
Rule out the variables first, be the evidence advisor,
Confirmation by GC-MS, don't act on immunoassay alone,
False positive versus true diversion — earn the data before you throw the stone
[Chorus]
PAINAD for the elder lost in fog,
FLACC for the child, Wong-Baker for the dialogue,
Structured risk before the opioids flow,
UDS positive? Metabolites — you gotta know
ASSESS before you prescribe, interpret what you see,
ORT, DIRE, PDMP — that's the pharmacology
20. Learning Objectives
[Verse 1]
Opioids first, let's autopsy the class
Mu-receptor agonists binding brainstem and spinal mass
Morphine, oxycodone, fentanyl patch
Inhibit adenylyl cyclase, potassium channels detach
Hyperpolarize the neuron, signal can't dispatch
Indications: acute and chronic pain, palliative attach
Contraindications — respiratory depression, watch your match
Paralytic ileus, head trauma, raised ICP
Monitor sedation scores or patients stop breathing free
Naloxone reversal sitting close, that antidote's the key
[Chorus]
Механизм, показания — знай их все
Indications, contraindications, adverse effects, dosе
Every analgesic class got a profile to compose
Запомни: onset, peak, duration — medicina flows
Mecanismo nel sangue, la farmacologia
Pain medicine, analgesic pharmacologia
[Verse 2]
NSAIDs next — COX inhibitors in the lab
COX-one protects the gut, COX-two fires the inflammatory jab
Nonselective agents hit both isoforms with a stab
Ibuprofen, naproxen — renally toxic, GI drab
Celecoxib spares the stomach but cardiovascular's the cab
Contraindicated: peptic ulcer, renal compromise, last trimester grab
Prostaglandin synthesis blocked, platelet aggregation slabs
Rare word incoming — analgesia's cousin: nociception
The actual transduction of damage into perception
Block the cyclooxygenase and intercept that signal's inception
[Chorus]
Механизм, показания — знай их все
Indications, contraindications, adverse effects, dosе
Every analgesic class got a profile to compose
Запомни: onset, peak, duration — medicina flows
Mecanismo nel sangue, la farmacologia
Pain medicine, analgesic pharmacologia
[Verse 3]
Local anesthetics — sodium channel blockade precise
Lidocaine, bupivacaine, ropivacaine, roll the dice
Smaller unmyelinated fibers blocked at lower price
Pain fibers first, then motor fibers sacrifice
Epinephrine co-injection vasoconstricts the splice
Prolongs the block, reduces systemic spice
Contraindicate epi on digits, ears, or penile device
Bupivacaine cardiotoxic — lipid emulsion is your vice
Toxicity presents as perioral tingling, then seizure, cardiac slice
Max dosing matters: lidocaine two to four milligrams per kilo precise
[Bridge]
Now adjuvants — the word is vellichor
That wistful ache of forgotten pharmacology lore
Gabapentinoids dampen calcium channel signal's core
TCAs modulate descending inhibition's floor
Ketamine NMDA antagonist, dissociative metaphor
Clonidine alpha-two, reduces central amplification's roar
Combine them wisely, multimodal is the score
Opioid-sparing strategy knocks at every door
[Chorus]
Механизм, показания — знай их все
Indications, contraindications, adverse effects, dosе
Every analgesic class got a profile to compose
Запомни: onset, peak, duration — medicina flows
Mecanismo nel sangue, la farmacologia
Pain medicine, analgesic pharmacologia
21. 1 Acetaminophen (Paracetamol)
[Verse 1]
Acetaminophen — the quiet pharmacist
No peripheral COX blockade, so it don't inflame your wrist
Central nervous system where it does its magic trick
Inhibits COX up in the brain, that's the mechanism
But wait — AM404 is lurking in the spinal cord
Endocannabinoid reuptake blocked, that's the reward
TRPV1 channels cooling down the thermal gate
Paracetamol working angles most analgesics can't imitate
[Chorus]
Cuatro gramos al día — ese es el límite, hermano
Watch your liver when the glutathione runs low
NAPQI accumulates, ese veneno es insano
N-acetylcysteine on deck — that's how we overthrow
Paracetamol — simple name, complicated soul
Quatre grammes par jour, connaître la dose, c'est le rôle
[Verse 2]
Now four grams daily — that's the ceiling for the healthy mass
But hepatic impairment drops that number pretty fast
Malnutrition depletes glutathione off the shelf
Chronic alcohol use — you stripping antioxidants from yourself
Low body weight demands a recalibration of the math
Hidden acetaminophen in NyQuil, Percocet, the combination path
Patients doubling doses — oblivious to the compound stacked
That's how toxicity arrives unannounced and inexact
[Chorus]
Cuatro gramos al día — ese es el límite, hermano
Watch your liver when the glutathione runs low
NAPQI accumulates, ese veneno es insano
N-acetylcysteine on deck — that's how we overthrow
Paracetamol — simple name, complicated soul
Quatre grammes par jour, connaître la dose, c'est le rôle
[Verse 3]
IV versus oral — now the bioavailability debate
Oral hits around eighty-five percent — respectable intake
IV bypasses first-pass, plasma peaks arrive pristine
But costs balloon astronomically for what oral can convene
Formulary committees sweating over cost per milligram
Hundred-dollar IV bag versus pennies in a program
Unless the gut is failing — NPO, ileus in the way
Oral is the workhorse that economics put on display
[Bridge]
Now the toxicology — NAPQI is the specter
Cytochrome P450 oxidation makes this toxicector
Glutathione conjugates it when reserves are plentiful and whole
But deplete those stores and hepatocyte necrosis takes its toll
Rumack-Matthew nomogram — plot the level on the line
Time post-ingestion versus concentration — read the sign
N-acetylcysteine replenishes that glutathione supply
Cysteine precursor, mucolytic — the antidote that won't deny
And here's a rare word — hepatic vellichor — no wait, true rare gift:
That word is siderosis — iron-laden cells adrift
But the word I'll give you: xanthochromic — amber-tinged, discolored serum stained
When bilirubin floods the plasma after liver cells are drained
[Chorus]
Cuatro gramos al día — ese es el límite, hermano
Watch your liver when the glutathione runs low
NAPQI accumulates, ese veneno es insano
N-acetylcysteine on deck — that's how we overthrow
Paracetamol — simple name, complicated soul
Quatre grammes par jour, connaître la dose, c'est le rôle
22. 2 NSAIDs and COX-2 Inhibitors
[Verse 1]
COX-1 keeps your stomach lining fed,
COX-2 fires up wherever there's inflammation spread,
Nonselective blockers hit 'em both, ibuprofen, naproxen in the lane,
Aspirin's acetyl group locks COX-1 irreversible, that's the permanent chain,
Platelets can't regenerate enzymes, so they're hobbled for their lifespan,
Celecoxib's selective, COX-2 only, that's the COX-2 selectin' plan,
Diclofenac preferential, sits between the two,
Know your spectrum front to back before you make a move
[Chorus]
COX один, COX два — запам'ятай,
GI, серце, нирки — все це знай,
Inhibez le COX, mais sachez le risque,
Sélectif ou non — choisissez dans la liste
[Verse 2]
GI toxicity, the mucosa pays the price,
When prostaglandin E2 drops, the barrier don't suffice,
Add a PPI or misoprostol if you want protection right,
H. pylori plus NSAID doubles ulcer risk overnight,
Ketorolac's potent but cap it at five days flat,
Exceed that limit and the GI bleed comes back,
Topical diclofenac for osteoarthritic knees,
Systemic sparing, local gain — evidence-based expertise
[Chorus]
COX один, COX два — запам'ятай,
GI, серце, нирки — все це знай,
Inhibez le COX, mais sachez le risque,
Sélectif ou non — choisissez dans la liste
[Verse 3]
Cardiovascular risk got complicated fast,
PRECISION trial compared celecoxib, ibuprofen, naproxen head to cast,
Celecoxib held its own, naproxen leans the safest cardiac side,
Diclofenac's the outlier, thrombotic risk runs wide,
Renal blood flow needs prostaglandins just to stay intact,
Drop 'em with an NSAID and your GFR gets cracked,
Triple whammy — NSAID plus ACE inhibitor plus a thiazide loop,
Hemodynamic AKI, hyperkalemia, papillary necrosis in the group
[Bridge]
Aspirin-exacerbated respiratory disease,
Leukotriene shunting when the COX pathway freeze,
Arachidonic acid routes itself to bronchoconstrict,
Avoid all nonselectives when that phenotype's picked,
Perioperative bleeding, hold the drug before the knife,
Bone healing controversy — osteoblasts suppressed in early life,
Anastomotic leak debated, evidence stays thin,
Pregnancy? Third trimester — ductus closes, don't begin
[Chorus]
COX один, COX два — запам'ятай,
GI, серце, нирки — все це знай,
Inhibez le COX, mais sachez le risque,
Sélectif ou non — choisissez dans la liste
[Outro]
Ibuprofen clears for pediatrics, ketorolac too in the right dose frame,
Oligohydramnios and ductus — third trimester carries all the blame,
Selective, preferential, nonselective — map the pharmacology,
COX inhibition's a calculated art, not a blanket apology
23. 3 Opioids
[Verse 1]
Mu receptors run the show, that's the primary gate
Delta, kappa, nociceptin — four locks on the plate
Peripheral receptors too, inflamed tissue binds tight
Morphine hits mu hard, pure agonist profile right
But kidneys failing? Metabolite accumulates
Morphine-6-glucuronide piles up, respiratory fate
Histamine releasing, watch the pressure cascade
Full agonist potency, but caution must be weighed
[Chorus]
Full agonists, partial, antagonists — three tiers to know
Morphine, fentanyl, methadone running the opioid show
Naloxone flips the switch when respiratory depression grows
Mu delta kappa nociceptin — four receptors in a row
Constipation never tolerates, that side effect won't go
Know your drug, know your patient — that's how clinical judgment flows
[Verse 2]
Fentanyl patch, don't apply near heat, absorption spikes fast
Opioid-naïve patients — contraindicated, that's the contrast
Delayed onset, delayed offset, reservoir in the skin
Buccal sublingual nasal routes when breakthrough pain moves in
Meperidine's near obsolete — normeperidine seizes brains
Serotonin syndrome lurking when you stack serotonergic chains
Codeine needs CYP2D6 to activate the kick
Ultra-metabolizers flood, pediatric patients — skip
[Chorus]
Full agonists, partial, antagonists — three tiers to know
Morphine, fentanyl, methadone running the opioid show
Naloxone flips the switch when respiratory depression grows
Mu delta kappa nociceptin — four receptors in a row
Constipation never tolerates, that side effect won't go
Know your drug, know your patient — that's how clinical judgment flows
[Verse 3]
Methadone got a half-life nobody fully clocks
Variable, prolonged — QT interval unlocks
Torsades de pointes waiting if you don't watch the trace
Complex conversion math, specialist must take that case
Buprenorphine, partial agonist, ceiling on the respiratory dip
High affinity receptor grip means precipitated withdrawal trip
Pull full agonists before you switch — timing is the art
Perioperative planning starts before the patient's chart
[Bridge]
Tramadol and tapentadol lower seizure threshold gates
SNRI serotonergic activity complicates
Naltrexone, nalmefene — long antagonist duration
Methylnaltrexone stays peripheral, gut constipation
Respiratory depression: CO2 response gets blunted first
Sedation is the warning sign before the breathing's worst
Capnography catches it before pulse ox sounds the alarm
PCA, abuse-deterrent formulations — minimize the harm
[Chorus]
Full agonists, partial, antagonists — three tiers to know
Morphine, fentanyl, methadone running the opioid show
Naloxone flips the switch when respiratory depression grows
Mu delta kappa nociceptin — four receptors in a row
Constipation never tolerates, that side effect won't go
Know your drug, know your patient — that's how clinical judgment flows
24. 4 Gabapentinoids
[Verse 1]
Alpha-two-delta, that's the calcium channel
Voltage-gated, presynaptic, let me break down the panel
Gabapentin binds it, pregabalin does too
Structural analogs of GABA but they don't act like GABA do
They don't hit the GABA receptor, that's the trap for the naive
They quiet the excited neurons, dampen signals they perceive
Reduce glutamate release, tamp the pain transmission down
Four gabapentinoids total — gabapentin wears the crown
Then pregabalin, gabapentin enacarbil, mirogabalin rounds it out
Extended release, prodrug forms, this whole class carries clout
[Chorus]
Alpha-two-delta is the lock, gabapentinoid is the key
Renal dosing mandatory — kidneys clear it, so adjust the creatinine degree
Postherpetic neuralgia, diabetic neuropathy — yeah the evidence hits hard
Fibromyalgia too, but sciatica and low back? Evidence is scarred
Sedation, dizziness, edema packing weight on
Combine with opioids — FDA says the respiratory brakes are gone
[Verse 2]
Titrate slow, that's the clinical commandment
Start low in the evening, battle the sedation management
Gabapentin dose three times daily, renal function changes everything
GFR drops below sixty, you cutting back the dosing
Pregabalin's more bioavailable, linear kinetics clean
Gabapentin absorption saturates — that distinction's what the boards convene
Misuse potential creeping up, especially in opioid-dependent folk
Euphoria augmentation, street value — this ain't a joke
Schedule five, pregabalin, some states escalating gabapentin too
Pharmacy monitoring programs watching what these prescribers do
[Chorus]
Alpha-two-delta is the lock, gabapentinoid is the key
Renal dosing mandatory — kidneys clear it, so adjust the creatinine degree
Postherpetic neuralgia, diabetic neuropathy — yeah the evidence hits hard
Fibromyalgia too, but sciatica and low back? Evidence is scarred
Sedation, dizziness, edema packing weight on
Combine with opioids — FDA says the respiratory brakes are gone
[Bridge]
Perioperative role got reconsidered, pulled back from the multimodal throne
Opioid-sparing benefit real but respiratory risk wasn't fully known
Elderly patients, sleep apnea, concurrent benzos in the mix
The math on pulmonary depression don't forgive those kinds of tricks
So weigh the risk, individualize, blanket protocols are obsolete
Mechanism's elegant but clinical nuance is the receipt
25. 5 Antidepressants
[Verse 1]
Tricyclics in the bloodstream, old school but they hit hard
Amitriptyline, nortriptyline, desipramine on the card
Block the reuptake — norepinephrine, serotonin double catch
Sodium channel blockade underneath, that's the cardiac scratch
Anticholinergic? Dry mouth, retention, blurry sight
Constipation creeping in, QTc stretching overnight
Screen that ECG before you write the script, don't skip
PR prolonging, QRS widening — watch the interval slip
Overdose is lethal, narrow therapeutic lane
Arrhythmia, seizures, coma — don't minimize the pain
Nortriptyline and desipramine got the cleaner side-effect curve
Desipramine less sedating — match the molecule to the nerve
[Chorus]
Давай, давай — TCAs блокируют канал
SNRIs raise the pressure, watch the sodium fall
Antidepressants on the pain clock, não é só tristeza
Duloxetine, venlafaxine — dor com mais certeza
QRS widening means danger, narrow window, fatal dose
SNRIs discontinue slow — taper every one of those
[Verse 2]
SNRIs stepping up — duloxetine leads the pack
Fibromyalgia, neuropathy, chronic low back
Venlafaxine shares the lane, milnacipran joins the floor
All three inhibit NE and serotonin at the core
But pressure climbs — hypertension is a documented fact
Baseline the vitals, monitor the trajectory, then react
Hyponatremia sneaks in through SIADH at the gate
Elderly patients, diuretics stacked — that's the highest-risk slate
Discontinuation syndrome — electric shock sensations, dread
Skip a venlafaxine dose and feel the zaps inside your head
Taper gradual, extend the interval, bridge if necessary
The half-life of venlafaxine short — respect that inventory
[Chorus]
Давай, давай — TCAs блокируют канал
SNRIs raise the pressure, watch the sodium fall
Antidepressants on the pain clock, não é só tristeza
Duloxetine, venlafaxine — dor com mais certeza
QRS widening means danger, narrow window, fatal dose
SNRIs discontinue slow — taper every one of those
[Verse 3]
SSRIs walk in last — fluoxetine, the crowd knows the name
Analgesic evidence? Sparse, inconsistent, weak the claim
Serotonin reuptake only, NE barely touched the dial
For chronic pain specifically, the data doesn't clear the trial
But interactions? That's the hazard hiding in the cabinet
Serotonin syndrome when you stack triptans — acknowledge it
MAOIs combined? Contraindicated, critical, deceased
Tramadol plus SSRI — serotonergic storm released
Bleeding risk elevated — platelets need that serotonin store
NSAIDs alongside SSRIs and the GI bleeds encore
So for pure analgesia SSRIs fall to third-tier rank
TCAs and SNRIs carry more weight in the pain bank
[Bridge]
Амитриптилин ночью — седативный эффект помогает спать
But the morning anticholinergic fog is a price you calculate
A dor não tem cor — pain doesn't show on any scan
Escolha a molécula certa — pick the right drug for the plan
Cardiac history? Reconsider every TCA you draft
Check that ECG, baseline sodium, pressure fore and aft
26. 6 Anticonvulsants (Non-Gabapentinoid)
[Verse 1]
Trigeminal neuralgia — electric bolts across the face,
Carbamazepine step up, the first-line holding its place,
Sodium channel blocker, slamming that voltage gate,
But before you even dose it, check the HLA straight —
HLA-B fifteen-oh-two, Southeast Asian descent,
Stevens-Johnson syndrome lurking if you don't prevent,
Oxcarbazepine cousin, cleaner on the liver side,
But hyponatremia creeping — check those sodium tides,
Salt dropping in the bloodstream, patients feeling strange,
Monitor electrolytes across the therapeutic range
[Chorus]
Carba-carba-mazepine, watch the sodium drop,
HLA screening, agranulocytosis don't stop,
Enzyme induction burning through the cytochrome chain,
Oxcarbazepine cousin, different but the same refrain —
Block that voltage channel, kill the trigeminal pain,
Screen before you prescribe or the harm will remain
[Verse 2]
Agranulocytosis — that's your white count crashing low,
Carbamazepine notorious, CBC before you go,
Enzyme induction raging through CYP three-A-four,
Your warfarin, your contraceptives falling through the floor,
Oral birth control patients — counsel hard on this,
Drug interactions multiplying, nothing you can miss,
Oxcarbazepine milder on the induction side,
Still pulls CYP three-A, though the pull ain't as wide,
Hyponatremia more pronounced with oxy than with carb,
Elderly patients especially — monitor each scar
[Chorus]
Carba-carba-mazepine, watch the sodium drop,
HLA screening, agranulocytosis don't stop,
Enzyme induction burning through the cytochrome chain,
Oxcarbazepine cousin, different but the same refrain —
Block that voltage channel, kill the trigeminal pain,
Screen before you prescribe or the harm will remain
[Verse 3]
Now the niche players rolling through the second row,
Lamotrigine — slow titration, rash is all you know,
Stevens-Johnson risk again if you escalate too fast,
Valproate for neuropathic — weight and liver last,
Teratogenic warning, neural tube defects loom,
Topiramate the weight-loss one, kidney stones in bloom,
Carbonic anhydrase inhibitor under the hood,
Cognitive side effects — patients call it brain-fog food,
Lacosamide enhancing slow inactivation clean,
Sodium channel modulator, the most nuanced we've seen
[Bridge]
Here's your word for the day — luculent — meaning clear,
Perfectly transparent, luminous, no smear,
A luculent diagnosis guides the drug you choose,
Carbamazepine for trigeminal, nothing left to lose —
but screen the HLA, check the sodium level twice,
Enzyme induction costs you — every drug has its price
[Chorus]
Carba-carba-mazepine, watch the sodium drop,
HLA screening, agranulocytosis don't stop,
Enzyme induction burning through the cytochrome chain,
Oxcarbazepine cousin, different but the same refrain —
Block that voltage channel, kill the trigeminal pain,
Screen before you prescribe or the harm will remain
27. 7 Local Anesthetics
[Verse 1]
Amides got two I's in the name, that's how you know 'em
Lidocaine, bupivacaine, ropivacaine — let me show 'em
Esters got one I: procaine, tetracaine, benzocaine squad
Amides metabolized hepatic, esters get cleaved by plasma cholinesterase broad
They block sodium channels, voltage-gated, phase-zero flat
Depolarization halted — nerve conduction stops right at that
Onset depends on pKa — lower means more un-ionized base
More lipid-soluble cross the membrane, hit the binding place
Bupivacaine slow onset but duration long — eight hours cardiac-bound
Lidocaine fast, intermediate — thirty minutes, good ground
Add epinephrine, vasoconstrict, cut the bleed and extend duration
Bicarbonate alkalinizes — speeds onset, slick equation
Dexamethasone prolongs the block through anti-inflammatory mediation
Clonidine alpha-two agonist adding sedation and sensation
[Chorus]
Amide or ester, sodium channel blocker
Two I's in the name or one — be a proper stocker
Max dose by weight, by site, by vascularity
LAST creeping in — lipid emulsion is the clarity
Lipo-somal slow release, topical patch it down
IV lidocaine periop — keep the pain profound-ly bound
[Verse 2]
Max dose principles — weight times limit, site matters most
Intercostal high absorption, gluteal low — that's the pharmacokinetic toast
Lidocaine plain — four-point-five milligrams per kilo is the cap
With epi push it seven — vasospasm buying extra lap
Bupivacaine two-point-five plain, never use with epi cardiac trap
Age and liver disease cut your ceiling — elderly patient, mind the gap
Now LAST — local anesthetic systemic toxicity, the specter at the feast
Prodromal: perioral numb, tinnitus, metallic taste, agitation released
Seizures follow, then cardiovascular collapse — arrhythmia, the beast
Twenty percent lipid emulsion — one-point-five per kilo bolus, cease
Infuse at point-two-five per kilo per minute, ASRA checklist greased
Avoid vasopressin, propofol won't replace the lipid piece
[Chorus]
Amide or ester, sodium channel blocker
Two I's in the name or one — be a proper stocker
Max dose by weight, by site, by vascularity
LAST creeping in — lipid emulsion is the clarity
Lipo-somal slow release, topical patch it down
IV lidocaine periop — keep the pain profound-ly bound
[Bridge]
Liposomal bupivacaine — Exparel's extended-release shell
Seventy-two hours infiltration, mixed data on nerve blocks — too early to tell
Lidocaine patch five percent — postherpetic neuralgia's nemesis
EMLA eutectic mixture forty-five minutes occlusive — venipuncture genesis
Capsaicin eight percent — defenestrates TRPV-one receptors, strips the wire
Depletes substance P, burning application, three months' respite entire
IV lidocaine infusions — perioperative: less opioid, faster gut return
Chronic pain neuropathic — membrane stabilizer, aberrant signals adjourn
Monitor EKG and pressure, watch the QRS and rate discern
28. 8 NMDA Antagonists
[Verse 1]
NMDA receptor, glutamate gate
Calcium flooding through when you block it, that's fate
Ketamine steps up, non-competitive bind
Dissociative king, works the open-channel kind
Phencyclidine cousin, arylcyclohexamine crew
Subanesthetic dosing — low and slow is true
Point one to point five per kilo IV
Opioid-sparing surgery, that's the clinical key
Wind-up phenomenon, central sensitization
Ketamine interrupts that synaptic conversation
[Chorus]
Антагонисты NMDA — блокируй канал
Ketamine, dextromethorphan — учи материал
Magnesium, memantine в игру входят тут
NMDA antagonists — pain в обход идут
[Verse 2]
Perioperative pain, refractory cases too
Esketamine — S-enantiomer, more potent view
Intranasal Spravato for treatment-resistant depression
Psychotomimetic side effects need your full attention
Hallucinations, dissociation, emergence reaction
Benzodiazepines nearby for hostile interaction
Hepatotoxicity — liver enzymes climbing high
Chronic dosing, check those LFTs, don't let it slide by
Ketamine cystitis — bladder wall contracting, scarred
Interstitial fibrosis when the recreational use hits hard
[Chorus]
Антагонисты NMDA — блокируй канал
Ketamine, dextromethorphan — учи материал
Magnesium, memantine в игру входят тут
NMDA antagonists — pain в обход идут
[Bridge]
Dextromethorphan — cough syrup with a secret role
Low-affinity NMDA block, adjuvant on parole
Quinidine combo boosts the bioavailability code
Nuedexta formulation walking that clinical road
Memantine — Alzheimer's drug, NMDA block mild
Chronic pain data stays inconclusive, evidence exiled
Magnesium — physiologic channel blocker, natural gatekeeper
Perioperative infusions, but the evidence ain't deeper
Abuse potential, ketamine — Schedule Three controlled
Dissociative high, the Special K story been told
[Verse 3]
So stratify your patients, monitor the mind
Subanesthetic bolus, infusion pump designed
Intraoperative ketamine cuts your morphine need
Refractory pain syndromes — neuropathic, cancer, freed
Psychomimetic prophylaxis, keep the midazolam near
Low-dose regimens minimize the psychedelic frontier
Esketamine nasal spray, supervised clinic dose
Treatment-resistant cases where opioids got too close
Hepatic function quarterly if you're dosing chronic-long
NMDA antagonism — block that calcium-ion song
[Chorus]
Антагонисты NMDA — блокируй канал
Ketamine, dextromethorphan — учи материал
Magnesium, memantine в игру входят тут
NMDA antagonists — pain в обход идут
[Outro]
Eight NMDA antagonists, ketamine leads the pack
Esketamine, dex, memantine, magnesium got your back
Block the open channel, calcium can't cascade
Wind-up sensitization — clinical pain gets paid
Блокируй, учи, запомни — NMDA
29. 9 Muscle Relaxants and Antispasmodics
[Verse 1]
Cyclobenzaprine on the shelf, it's a tricyclic clone
Blocks spasm at the brainstem, not just muscle alone
Methocarbamol, sedation mild, for the acute sprain
Seven to ten days maximum, then you pull the rein
Tizanidine's an alpha-two, it drops the tone down smooth
But watch the liver enzymes spike, check the baseline groove
Hypotension lurking when you combine it with the clonidine class
Transaminases creeping up — that hepatotoxic gas
[Chorus]
Cyclo, methocarbamol, tizanidine — alpha-two
Baclofen for the spastic cord, withdrawal can subdue
Carisoprodol metabolizes meprobamate straight
Benzo ain't analgesic — don't conflate, don't conflate
Muscle relaxants, antispasmodics — know the nine
Evidence thin for low back pain, but know the line
[Verse 2]
Baclofen hits the GABA-B, spinal cord is where it speaks
Intrathecal pump delivery when the oral dose leaks
Now you discontinue baclofen cold — the body screams foul
Autonomic storm, hallucinations, seizures on the prowl
Intrathecal withdrawal is a fulminant cascade
Taper slow, recirculate — don't let that pump degrade
The word is "fulminating" — erupting fierce and fast
Like baclofen withdrawal hitting hard, designed to outlast
[Chorus]
Cyclo, methocarbamol, tizanidine — alpha-two
Baclofen for the spastic cord, withdrawal can subdue
Carisoprodol metabolizes meprobamate straight
Benzo ain't analgesic — don't conflate, don't conflate
Muscle relaxants, antispasmodics — know the nine
Evidence thin for low back pain, but know the line
[Verse 3]
Carisoprodol — Soma on the street, they know the name
Metabolite meprobamate, barbiturate-adjacent game
Schedule Four controlled, abuse potential real and thick
Sedation stacks with opioids, polypharmacy sick
Benzodiazepines get grabbed for spasm on the ward
But evidence for analgesic use? You can't afford
They sedate, they cause dependence, slow the rehab down
Prescribing benzos for back pain — hand the fool his crown
[Bridge]
Now the evidence is lacunar — meaning full of holes and gaps
Systematic reviews for acute low back, collapse on maps
Short-term benefit marginal, no superiority shown
Between the agents listed — you pickin' mostly on your own
Lacunar: riddled with hollow spaces, porous as old stone
The data's got more gaps than answers sitting on the throne
So counsel on sedation, falls, the CNS depression weight
Non-pharm approaches first — mobilize, don't just sedate
[Chorus]
Cyclo, methocarbamol, tizanidine — alpha-two
Baclofen for the spastic cord, withdrawal can subdue
Carisoprodol metabolizes meprobamate straight
Benzo ain't analgesic — don't conflate, don't conflate
Muscle relaxants, antispasmodics — know the nine
Evidence thin for low back pain, but know the line
[Outro]
Nine relaxants, know the mechanisms cold
Hepatotox, hypotension, withdrawal stories told
Abuse potential, metabolites, the intrathecal route
Evidence lacunar — keep your clinical doubt
30. 10 Corticosteroids
[Verse 1]
Corticosteroids, synthetic cortisol kin,
Bind glucocorticoid receptors deep within,
Suppress phospholipase A2, halt arachidonate,
No prostaglandins cooking, inflammation can't proliferate,
Dexamethasone, prednisone, methylprednisolone,
Hydrocortisone, triamcinolone holding its own,
Betamethasone for the epidural space,
Budesonide, fludrocortisone keeping pace,
Deflazacort and paramethasone round the list complete,
Ten agents in the arsenal, memorize the fleet
[Chorus]
DEX PRED METHYL HYDRO — four that lead the pack,
BETA BUDE FLUDRO — covering front and back,
TRIAMCINOLONE joints, DEFLAZACORT precise,
PARAMETHASONE closing — ten names, run it twice,
Corticosteroids cut the tumor's stranglehold,
Nerve compression, bone pain, cancer — that's the role they hold
[Verse 2]
Systemic use for cancer pain, mechanism runs deep,
Reduce peritumoral edema while the patient tries to sleep,
Nerve compression from a mass? Dexamethasone's decree,
Four to sixteen milligrams daily, titrate carefully,
Bone pain from metastatic spread, prostaglandins fanning flames,
Steroids quench that biochemical cascade, neutralize the claims,
Appetite stimulation, antiemetic bonus round,
Mood elevation short-term, these secondary gains compound,
But the clock is ticking on that systemic dose you give,
Calculate the benefit-to-burden ratio if they live
[Chorus]
DEX PRED METHYL HYDRO — four that lead the pack,
BETA BUDE FLUDRO — covering front and back,
TRIAMCINOLONE joints, DEFLAZACORT precise,
PARAMETHASONE closing — ten names, run it twice,
Corticosteroids cut the tumor's stranglehold,
Nerve compression, bone pain, cancer — that's the role they hold
[Verse 3]
Adverse effects accumulate like interest on a debt,
Adrenal suppression — hypothalamic-pituitary reset,
Cushingoid features, osteoporosis fractures cascade,
Hyperglycemia spiking, immunosuppression's blade,
Myopathy proximal, GI mucosa stripped thin,
Psychiatric breaks and cataracts creeping in,
Avascular necrosis — femoral head collapses clean,
Fluid retention, hypertension, metabolic mischief unseen,
Taper don't abruptly stop or adrenal crisis drops the floor,
HPA axis needs that slow wean to restore
[Bridge]
Epidural steroids — triamcinolone, betamethasone placed,
Reducing radicular inflammation, nerve root irritation chased,
Intra-articular injections, synovial inflammation blocked,
Evidence is moderate, frequency must be clocked,
Too many shots, the cartilage degrades beneath the scope,
Particulate versus non-particulate — know before you inject the dope,
Intravascular injection, spinal cord infarct risk is real,
Fluoroscopic guidance, contrast confirmation — that's the deal
[Chorus]
DEX PRED METHYL HYDRO — four that lead the pack,
BETA BUDE FLUDRO — covering front and back,
TRIAMCINOLONE joints, DEFLAZACORT precise,
PARAMETHASONE closing — ten names, run it twice,
Corticosteroids cut the tumor's stranglehold,
Nerve compression, bone pain, cancer — that's the role they hold
31. 11 Cannabinoids
[Verse 1]
Endocannabinoid system, let me break it clean
CB1 receptors poppin' in the brain machine
CB2 peripheral, immune cells on patrol
Anandamide and two-AG runnin' the whole scroll
Retrograde signaling, presynaptic suppression
Modulate the pain gate, that's the core lesson
Eleven cannabinoids we gotta dissect today
Phytocannabinoids, synthetic, endogenous relay
[Chorus]
THC, CBD, nabilone, nabiximols
Four keys to the kingdom when neuropathic pain calls
Spasticity, cancer pain, evidence we appraise
Schedule the receptor, count the adverse phase
Eleven cannabinoids — lock 'em in your brain
CB1, CB2, retrograde the lane
Agonist, antagonist, partial in the mix
Know your regulatory status or you'll catch no fix
[Verse 2]
THC is delta-nine, partial CB1 agonist
Psychoactive, antiemetic, analgesic specialist
CBD non-intoxicating, modulates the pain
TRPV1 and serotonin running through its vein
Nabilone synthetic, THC analog prescribed
Chemotherapy nausea, Schedule Two derived
Nabiximols is Sativex, oromucosal spray
THC plus CBD ratio, spasticity at bay
Multiple sclerosis patients getting functional relief
Neuropathic pain adjunct, measured on belief
[Chorus]
THC, CBD, nabilone, nabiximols
Four keys to the kingdom when neuropathic pain calls
Spasticity, cancer pain, evidence we appraise
Schedule the receptor, count the adverse phase
Eleven cannabinoids — lock 'em in your brain
CB1, CB2, retrograde the lane
Agonist, antagonist, partial in the mix
Know your regulatory status or you'll catch no fix
[Bridge]
Adverse effects catalogue, memorize the stack
Tachycardia, paranoia, cognitive hijack
Dizziness, dry mouth, psychosis in susceptible
Cannabinoid hyperemesis, cyclical inceptible
Drug interactions — CYP three-A-four and two-C-nine
Warfarin, clobazam, sedatives align
Additive CNS depression, flag it every time
Pregnancy contraindicated, pediatric climb
Evidence appraisal — moderate for neuropathic nerve
Cochrane says the numbers modest but the signal holds a curve
Number needed to treat around ten to twelve
Weigh the NNH against the benefit on the shelf
[Verse 3]
Regulatory status shifts state to federal ground
Schedule One federal but exemptions come around
Epidiolex is FDA approved CBD pure
Dravet syndrome, Lennox-Gastaut, seizure cure
Dronabinol Schedule Three, appetite in AIDS
Cancer cachexia, antiemetic cascades
Physician gotta document the indication clear
Titrate slow, start low, watch for adverse gear
Informed consent includes the psychiatric risk
Dependency potential seven to nine percent brisk
[Chorus]
THC, CBD, nabilone, nabiximols
Four keys to the kingdom when neuropathic pain calls
Spasticity, cancer pain, evidence we appraise
Schedule the receptor, count the adverse phase
Eleven cannabinoids — lock 'em in your brain
CB1, CB2, retrograde the lane
Agonist, antagonist, partial in the mix
Know your regulatory status or you'll catch no fix
32. 12 Other Agents
[Verse 1]
Alpha-2 agonists, clonidine on deck
Dexmedetomidine keeping ICU in check
Hit the presynaptic receptor, drop the NE release
Sympatholytic properties bringing pain some peace
Clonidine patch for chronic, epidural for the block
Dex for procedural sedation, round the clock
Hypotension, bradycardia, watch the vital signs
Mechanism: descending modulation through the spinal lines
[Chorus]
Twelve other agents, heterogeneous crew
Bone pain, head pain, visceral — each one got a queue
Alpha-2 for sympathetic, bisphosphonate for bone
Triptans hunting serotonin, antispasmodics for the groan
Nav one-point-eight blockers knocking at the gate
Novel non-opioid targets — pharmacology's fate
[Verse 2]
Bisphosphonates inhibit osteoclast resorption
Denosumab blocks RANK-L — receptor interception
Zoledronic acid quarterly for metastatic bone
Calcitonin drops the calcium, works the nasal zone
Inhibits osteoclasts through calcitonin receptors sited
Plus central analgesic effects — still somewhat debated
Salmon calcitonin, vertebral fractures in the game
Short-term relief, but long-term benefit? Murky, never plain
[Chorus]
Twelve other agents, heterogeneous crew
Bone pain, head pain, visceral — each one got a queue
Alpha-2 for sympathetic, bisphosphonate for bone
Triptans hunting serotonin, antispasmodics for the groan
Nav one-point-eight blockers knocking at the gate
Novel non-opioid targets — pharmacology's fate
[Verse 3]
Migraine specific — triptans serotonin one-B one-D
Vasoconstrict the meningeal vessels, abort the misery
CGRP antagonists — gepants block the peptide cold
Lasmiditan hits the one-F receptor, no vasoconstriction told
Erenumab, fremanezumab — monoclonal prevention lane
Anti-CGRP antibodies quarterly, reducing migraine rain
Hyoscine blocks muscarinic, smooth muscle cramp released
Dicyclomine for IBS, visceral spasm decreased
[Bridge]
Now we push the frontier, suzetrigine in the ring
Nav one-point-eight selective — peripheral pain a stinging thing
Spares the cardiac channels, targets sensory alone
Tanezumab chased NGF but joint destruction — thrown a bone
Anti-NGF antibodies shelved by safety red flags raised
Accelerated osteoarthritis — enthusiasm hazed
But the target still legitimate, the science still stands clear
Non-opioid chronic pain solutions — engineered
[Chorus]
Twelve other agents, heterogeneous crew
Bone pain, head pain, visceral — each one got a queue
Alpha-2 for sympathetic, bisphosphonate for bone
Triptans hunting serotonin, antispasmodics for the groan
Nav one-point-eight blockers knocking at the gate
Novel non-opioid targets — pharmacology's fate
[Outro]
Clonidine, dex, bisphosphonates, calcitonin — locked in
Triptans, gepants, antispasmodics — stack 'em up, begin
Suzetrigine selective sodium, next generation real
Twelve agents deep in the arsenal — precision pain reveal
33. Self-Assessment
[Verse 1]
Morphine hits the liver, glucuronidation's the lane
M6G builds up when kidneys can't flush the drain
Renal failure patients catch the brunt of that ride
Codeine needs CYP2D6 to flip to morphine inside
Ultra-rapid metabolizers — toxic surge, no guide
Meperidine normeperidine accumulates with glee
Seizure risk in elderly, renally compromised, you see
Fentanyl runs through CYP3A4, lipophilic and clean
But watch hepatic blood flow, context-sensitive morphine machine
[Chorus]
Acetaminophen, NSAIDs, opioids in line
Conozca sus límites — where the ceiling is defined
LAST in your pocket, lipid emulsion on deck
Evalúa al paciente — or you'll wind up a wreck
Metabolize it, memorize it, metabolize it right
Dosis por dosis, keep your pharmacology tight
[Verse 2]
Now acetaminophen, four grams is the healthy cap
But chronic alcohol thins the glutathione map
Malnourished bodies, low reserves can't quench the blaze
Hepatic disease shrinks that ceiling into a haze
Two grams daily — that's the prudent dose you'll praise
Fasting state depletes the cofactors overnight
CYP2E1 upregulation amplifies the blight
So alcoholics, cirrhotic patients, underweight — beware
That extra dose becomes a necrotic snare
[Chorus]
Acetaminophen, NSAIDs, opioids in line
Conozca sus límites — where the ceiling is defined
LAST in your pocket, lipid emulsion on deck
Evalúa al paciente — or you'll wind up a wreck
Metabolize it, memorize it, metabolize it right
Dosis por dosis, keep your pharmacology tight
[Verse 3]
Now lisinopril blocks angiotensin, drops efferent tone
Furosemide depletes the volume, kidneys on their own
CKD three-b means GFR already frail
NSAIDs block prostaglandins — renal perfusion derails
That triple threat — the nephrotoxic bermuda gale
Prostaglandins dilate afferent arterioles with care
Remove that dilation, tubular necrosis waits right there
Hyperkalemia spikes, sodium retention compounds the mess
Contraindication absolute — no exceptions, reassess
[Bridge]
Here's a rare word — iatrogenic — physician-caused harm
Every drug decision either treats or springs the alarm
Catecholamine cascade fuels LAST — the toxidrome unfurled
Local anesthetic systemic toxicity — lipid rescue hurled
Twenty percent intralipid bolus, one-point-five per kilo fast
Then infusion runs at point-two-five until the seizure's past
Benzodiazepines for convulsions, avoid propofol if you can
Cardiovascular collapse — ACLS but modified plan
[Chorus]
Acetaminophen, NSAIDs, opioids in line
Conozca sus límites — where the ceiling is defined
LAST in your pocket, lipid emulsion on deck
Evalúa al paciente — or you'll wind up a wreck
Metabolize it, memorize it, metabolize it right
Dosis por dosis, keep your pharmacology tight
[Outro]
Morfina, codeína, fentanilo — know the route
Glutathione, prostaglandins — never brush them out
LAST sequence tattooed in the cortex of your mind
La farmacología del dolor — the sharpest discipline you'll find
34. Learning Objectives
[Verse 1]
Pull up the chart, patient in pain, time to strategize
Acute phase hits different than the chronic enterprise
CDC guidelines twenty-two, got 'em memorized
Non-opioid first line, that's the principle baptized
NSAIDs and acetaminophen, start low go slow
Functional goals matter more than a zero on the scale, you know
Limit acute scripts to three days, maybe seven max
Reassess before you refill, document every track
MME calculations keeping dosing in the bracket
Morphine milligram equivalents, don't you ever lack it
Fifty MME daily, that's the threshold where you pause
Ninety MME, danger zone — respect pharmacologic laws
[Chorus]
R-O-T-A-T-E when tolerance climbs the wall
T-A-P-E-R slow and steady when you need to forestall
Assess the function, reassess the risk
Urine drug screen, prescription monitoring — don't get dismissed
Opioid rotation, incomplete cross-tolerance in the mix
Reduce the equianalgesic dose by twenty-five to sixty
These the guidelines, ain't no shortcuts in this game
Protocol protect the patient, that's the mission and the aim
[Verse 2]
Now chronic pain's a different beast, it's multidimensional
The biopsychosocial model — that's the professional credential
Risk stratify before you prescribe, ORT in hand
Opioid Risk Tool scoring, low to high demand
Aberrant behaviors, watch the velleity — that subtle
Wanting without acting, early signal in the muddle
Prescription drug monitoring program, check it every time
State database cross-referencing, catching the paradigm
Informed consent documented, treatment agreement signed
Goals established — function, sleep, and quality of mind
Urine screens, pill counts, PDMP, the whole quartet
Harm reduction isn't punitive, it's clinical etiquette
[Chorus]
R-O-T-A-T-E when tolerance climbs the wall
T-A-P-E-R slow and steady when you need to forestall
Assess the function, reassess the risk
Urine drug screen, prescription monitoring — don't get dismissed
Opioid rotation, incomplete cross-tolerance in the mix
Reduce the equianalgesic dose by twenty-five to sixty
These the guidelines, ain't no shortcuts in this game
Protocol protect the patient, that's the mission and the aim
[Verse 3]
Rotation time — the receptor's grown refractory
Switch the molecule, different binding satisfactory
Equianalgesic tables out, methadone needs a specialist
Complex kinetics, long half-life — put that on your checklist
Hydromorphone to oxycodone, fentanyl to morphine
Calculate conservatively, keep the patient intervening
Incomplete cross-tolerance means the new drug hits harder
Cut the calculated dose, then titrate smarter
Breakthrough dosing ten to fifteen percent of the daily total
Reassess at forty-eight hours, keep the management modal
35. 1 Frameworks and Guidelines
[Verse 1]
Nineteen eighty-six, Geneva conference hall
WHO dropped a ladder on the analgesic wall
Three rungs climbing upward, non-opioid first
Mild to moderate, quench that nociceptive thirst
Step one's aspirin, acetaminophen, NSAIDs
Step two adds codeine, tramadol if the patient needs
Step three brings morphine, oxycodone, full agonist power
But critics said the ladder crumbled in the cancer pain hour
Said it missed interventional, left the neuraxial out
So now a fourth step handles what the rungs couldn't rout
Spinal cord stimulators, intrathecal infusion lines
The ladder grew a penthouse floor with interventional designs
[Chorus]
WHO ladder, three steps plus a fourth we added on
CDC twenty-twenty-two says non-opioid's where you belong
Lowest dose, immediate-release, don't initiate with ER
Reassess your patient, don't discontinue cold or hard
MME is your calculus, your risk thermometer reading
Fifty's a caution flag, ninety's where the danger's bleeding
Canadian, NICE, Australian — they rhyme but diverge in the weeds
Know your framework, know your guideline, know exactly what your patient needs
[Verse 2]
CDC dropped twenty-twenty-two, rewrote the clinical script
No hard dose ceilings, but every principle is equipped
Non-opioid therapy first — that's the cardinal decree
Multimodal approaches before you hand the opioid key
Immediate-release formulations when you're starting out
Not extended-release, never start with the long-acting route
Acute pain duration — three days often does the deed
Seven days the ceiling for most presentations of need
Reassess, reassess — check function, check the pain score
Avoid abrupt discontinuation, taper or you'll cause more harm than before
[Verse 3]
Now let's parse the MME — morphine milligram equivalent math
A conversion currency to track the opioid dosage path
Oral morphine is the anchor, every drug converts across
Hydrocodone one-to-one, hydromorphone costs you more
Oxycodone multiply by one-point-five to translate
Fentanyl patches demand a different conversion rate
But here's the shibboleth — the word that marks the knowing few
Buprenorphine's partial agonist ceiling breaks the MME through
Methadone's half-life curves in ways that calculators can't define
Both excluded from the standard table by pharmacokinetic design
Fifty MME daily raises the clinician's brow
Ninety MME triggers naloxone co-prescription now
[Bridge]
Canadian guidelines emphasize the functional taper and tread
NICE in the UK draws harder lines on long-term opioid spread
Faculty of Pain Medicine in Australia stresses informed consent
Each framework agrees on risk but not where every boundary's meant
The divergence isn't failure — it's epidemiology speaking different dialects
Regional data shapes the guidance, context shapes what the evidence reflects
36. 2 Acute Opioid Prescribing
[Verse 1]
Post-op patient waking up, pain is climbing fast
Non-opioids came first, that's the protocol we passed
Acetaminophen stacked, NSAIDs in the mix
Regional blocks deployed before we reach the fix
But when the multimodal spread ain't cutting through the haze
Acute opioids step in for a strictly numbered phase
Immediate-release only, short-acting is the rule
Extended-release concurrent? Nah, that ain't the tool
[Chorus]
IR first, short duration, quantity controlled
No ER concurrent, that's the doctrine we uphold
Dispose the excess, educate before they leave
Post-discharge predictors — watch the patient, watch the need
IR first, short duration, tight supply
Persistent use creeping in, we gotta recognize the signs
[Verse 2]
Michigan OPEN did the math, procedure-by-procedure counted
Wisdom teeth removal — four days, don't surpass it
Laparoscopic chole? Maybe five at most
Hernia open repair, the data drives the dose
Not a blanket script you write without the evidence to back
Tailor to the surgery type and document the track
Patient leaves with naloxone, lock box in the home
Disposal instructions, don't leave unused pills alone
[Chorus]
IR first, short duration, quantity controlled
No ER concurrent, that's the doctrine we uphold
Dispose the excess, educate before they leave
Post-discharge predictors — watch the patient, watch the need
IR first, short duration, tight supply
Persistent use creeping in, we gotta recognize the signs
[Bridge]
Now persistent postoperative use — let's break it down cold
Roughly six to ten percent keep filling past the threshold
Preoperative opioid history, that's predictor number one
Anxiety, depression, substance use — the vul-ner-a-bil-i-ty run
Catastrophizing pain behavior, chronic preexisting sites
Higher intraoperative doses correlate with longer nights
Prevention starts before the knife ever breaks the skin
Screen the psychosocial factors, build the plan back then
[Verse 3]
Counsel every patient: pain resolves but pills persist
The leftover supply is how addiction gets a fist
Opioid naïve patients face the steepest slippery slope
Three days stretches into thirty if nobody intervenes the hope
Prescription drug monitoring programs, check before you sign
One prescriber, one pharmacy, one patient at a time
Quantity limits aren't just policy, they're pharmacologic sense
Lower total exposure means lower consequence
[Chorus]
IR first, short duration, quantity controlled
No ER concurrent, that's the doctrine we uphold
Dispose the excess, educate before they leave
Post-discharge predictors — watch the patient, watch the need
IR first, short duration, tight supply
Persistent use creeping in, we gotta recognize the signs
37. 3 Long-Term Opioid Therapy for Chronic Non-Cancer Pain
[Verse 1]
SPACE trial dropped the data, systematic reviews confirmed
Modest gains in function, dose-dependent harm we learned
Opioids for chronic pain ain't the silver caliber
Patient selection critical, screen before you prescribe her
Rule out active substance use disorder, untreated mental state
Sleep apnea lurking, that sedation gonna complicate
Set the goals on function, not the numerical score
Can you walk the block, return to work, do what you did before
Frame it as a trial, ninety days, defined endpoint clear
Treatment agreement signed, expectations engineered
[Chorus]
SPACE, PDMP, UDT — that's the trinity
Function over scores, that's the clinical dignity
Fifty MME, watch the threshold creeping tall
No escalation without benefit, document it all
Bowel regimen at day one, tolerance don't apply to gut
Screen for apnea, check the hormones, keep the protocol shut-tight
[Verse 2]
Morphine milligram equivalents, fifty is the yellow flag
Ninety MME or higher, now the risk is off the map
Don't escalate the dosage if the function ain't improved
Ceiling principle embedded, gotta stay within the groove
Pill counts random, urine drug test verify
Prescription drug monitoring every single time you write
Reassess at intervals, quarterly at the least
Documenting benefit, risk, and every increase
If the patient's not responding, taper down the load
No reward for tolerance alone, that ain't a valid road
[Chorus]
SPACE, PDMP, UDT — that's the trinity
Function over scores, that's the clinical dignity
Fifty MME, watch the threshold creeping tall
No escalation without benefit, document it all
Bowel regimen at day one, tolerance don't apply to gut
Screen for apnea, check the hormones, keep the protocol shut-tight
[Bridge]
Extended-release formulations, timing matters here
Opioid-naïve patient? Methadone? Keep that far from near
Never for acute pain, the guidelines hammered that
Conversion calculations, pharmacokinetics exact
Hypogonadism creeping in from long-term opioid press
Testosterone tanking, libido in distress
Nausea hits the first two weeks, antiemetics bridge
Sedation from the steady state, check the CNS ridge
Constipation permanent — bowel never adapts
Senna and osmotic agents from the very first relapse
[Verse 3]
So you got a patient, sixty-two, degenerative spine
Failed the PT, failed the NSAIDs, gabapentin down the line
Now you're weighing opioid trial, document the rationale
Baseline function scored and noted, buprenorphine if available
Informed consent covers: addiction, falls, and overdose
Naloxone prescribed alongside, every patient gets a dose
Thirty-day supply to start, no long-acting right away
Conversion to extended-release after stable on short-day
Then reassess at thirty, sixty, ninety off the clock
If function's flat and pain unchanged, it's time to walk the doc back
38. 4 Opioid Rotation and Conversion
[Verse 1]
Patient tolerating poorly, adverse effects got 'em drowning
Nausea, sedation, myoclonus — symptoms stacking, compounding
Inadequate analgesia, route switch, kidney function slipping
Cost and access blocking therapy — that's when rotation's fitting
Five indications, memorize the grid:
Intolerable side effects, poor control, renal skid
Route change, formulary wall — when any one applies
Pull out the conversion table, calculate with precise eyes
[Chorus]
Total daily dose — add every milligram up
Convert with the table, then cut it — incomplete cross, so cut
Thirty percent reduction minimum for tolerance gap
Breakthrough dosing ten to fifteen percent back on the map
Reassess in twenty-four, don't set it and forget
T-D-C-R-B — five steps, no regrets
[Verse 2]
Oral morphine to IV, divide by three — that's the ratio
Oral to transdermal fentanyl, every sixty morphine milligrams daily flow
Converts to twenty-five micrograms per hour patch adhered
IV to oral, flip the fraction — multiply, be clear
Fentanyl patch takes twelve to eighteen hours to absorb and peak
Overlap your coverage when transitioning, plug every leak
Fever and heat increase the flux right through the dermis
Don't let assumptions burn the patient — check the surface
[Chorus]
Total daily dose — add every milligram up
Convert with the table, then cut it — incomplete cross, so cut
Thirty percent reduction minimum for tolerance gap
Breakthrough dosing ten to fifteen percent back on the map
Reassess in twenty-four, don't set it and forget
T-D-C-R-B — five steps, no regrets
[Verse 3]
Methadone — the outlier, non-linear conversion beast
Low morphine equivalents, ratio three to one at least
High-dose morphine, ratio climbs to twelve or even more
Dose-dependent, unpredictable — don't walk through that door alone
QT prolongation lurking, long half-life accumulates slow
Call the specialist, involve pharmacy before you go
Buprenorphine transitions need a micro-induction mind
No full agonist ceiling clash — sequence matters every time
[Bridge]
Sources of error lurking in the decimal placement
Wrong direction of conversion — oral read as IV patient
Forgetting incomplete cross-tolerance, skipping the reduction
Stacking breakthrough doses wrong, ignoring organ dysfunction
Pediatric weight-based slip, elderly with slowed clearance
Every error downstream means respiratory impairment
Double-check your math, your route, your organ function score
Consult when uncertain — that's not weakness, that's the floor
[Chorus]
Total daily dose — add every milligram up
Convert with the table, then cut it — incomplete cross, so cut
Thirty percent reduction minimum for tolerance gap
Breakthrough dosing ten to fifteen percent back on the map
Reassess in twenty-four, don't set it and forget
T-D-C-R-B — five steps, no regrets
39. 5 Tapering and Discontinuation
[Verse 1]
Patient on opioids six years straight, tolerance stacked up like compound interest on a debt
Lack of benefit, harm on the chart, aberrant behavior, or they came requesting it themselves
OUD diagnosis flips the script, time to pivot, can't just yank the cord and walk away
FDA put that warning in red ink — abrupt cessation courts withdrawal, suicide, overdose decay
So we calculate the load, morphine milligram equivalents, audit every pill
Long-term therapy means slow the pace way down, individualized taper by the body's will
Ten percent monthly, sometimes less, the slower the descent the safer the landing strip
Pauses are permitted when the patient destabilizes — this ain't a competition, it's a clinical trip
[Chorus]
COWS score to measure where they stand — Clinical Opiate Withdrawal, count it hand to hand
Clonidine for the autonomic surge, loperamide for the gut, antiemetics for the purge
Slower for the long-term, individualized the rate
Shared decisions, psych support — taper smart, taper safe
Buprenorphine waiting at the gate when the calculus says switch
Don't abrupt, don't abandon — walk them off the pitch
[Verse 2]
Clonidine alpha-two agonist, suppresses that noradrenergic flood
Loperamide tightens up the bowel cramps, antiemetics handle nausea in the blood
COWS scale scores eleven symptoms — restlessness, rhinorrhea, yawning, piloerection
Pulse elevated over one hundred, sweat and tremor map the whole autonomic direction
Mild is under thirteen, moderate climbs to twenty-four, severe is thirty-six and past
Symptomatic care targeted to the number — treat what's measurable, nothing more, nothing less
This is pharmacology meeting human suffering at a documented intersection
Not a moral failing charted in the notes but a physiologic recalibration in session
[Chorus]
COWS score to measure where they stand — Clinical Opiate Withdrawal, count it hand to hand
Clonidine for the autonomic surge, loperamide for the gut, antiemetics for the purge
Slower for the long-term, individualized the rate
Shared decisions, psych support — taper smart, taper safe
Buprenorphine waiting at the gate when the calculus says switch
Don't abrupt, don't abandon — walk them off the pitch
[Bridge]
Inherited patient on three hundred MME, predecessor gone, now sitting in your chair
You don't accelerate the reduction to match your comfort level — that's iatrogenic harm right there
Document the rationale, acknowledge the prior regimen, set the plan in mutual view
Psychological scaffolding through every dose reduction — therapy concurrent, not a residual
When cravings spike and function drops consider buprenorphine's partial agonist ceiling
Lower overdose mortality, evidence stacked — shared decision-making is the actual healing
40. 6 Communication and Documentation
[Verse 1]
Sitting with a patient, pain scale at a nine
Got to lay the table out before I co-sign
Risks and benefits, not a monologue — a dialogue
Informed consent is the bedrock, not the epilogue
Tell 'em opioids carry weight like a legal brief
Sedation, constipation, tolerance underneath
Addiction risk is real, don't sugarcoat the data
Set the expectation now or pay the price later
Function over euphoria, that's the target metric
Goals of care defined so the plan stays symmetric
If they push for escalation, don't just fold and yield
Explain the ceiling, name the reason, hold the field
[Chorus]
Dokumentiere alles — write it down, lock it tight
Rationale, the MME, the monitoring in sight
Schreib den Plan — document the why, not just the what
PDMP before you prescribe, don't skip that stop
Kontrolliere, reguliere — controlled substance law
E-prescribing mandates, no exceptions, no withdraw
Dokumentiere alles, every visit, every call
If it isn't in the chart, it didn't happen at all
[Verse 2]
MME — morphine milligram equivalents — do the math
Ninety milligrams a day and you're on a flagged path
Conversion factors lurking where the dosing gets dense
Methadone ratios shifting — gotta stay immense-ly careful, non-linear pharmacokinetics bite
Document the calculation, show your work tonight
Risk stratification scores, the ORT, the DIRE
Urine tox, prescription monitoring — build the file higher
Not paperwork for paper's sake — it's proleptic care
Anticipating future audit, future claim, future snare
Proleptic: acting on what's coming, not just what's here
Every note a shield and compass simultaneously clear
[Chorus]
Dokumentiere alles — write it down, lock it tight
Rationale, the MME, the monitoring in sight
Schreib den Plan — document the why, not just the what
PDMP before you prescribe, don't skip that stop
Kontrolliere, reguliere — controlled substance law
E-prescribing mandates, no exceptions, no withdraw
Dokumentiere alles, every visit, every call
If it isn't in the chart, it didn't happen at all
[Verse 3]
DEA Schedule II means no phone refills allowed
Electronic Prescription for Controlled Substances — state law now crowned
EPCS systems need two-factor, don't bypass
Hard copy rules in some jurisdictions, read the statutes fast
PDMP — the Prescription Drug Monitoring Program — query first
Before you touch that pad, check who already quenched their thirst
Multiple prescribers, overlapping fills — red flags bloom
Document you checked it, document the room-for-doubt consumed
Treatment agreements, signed and scanned, not just implied
Aberrant behavior triggers — note each one inside
41. Self-Assessment
[Verse 1]
Post-lap chole, patient's waking up, gotta build the bridge
From IV to oral, structured plan, nothing left to fridge
Acetaminophen scheduled, gram by gram, four times a day
Celecoxib riding shotgun, inflammation kept at bay
Opioids short-acting, low-dose hydrocodone PRN
Seventy-two hour window, taper down and don't extend
Counsel on constipation, stool softener from the gate
Document the allergies, functional goals, discharge straight
[Chorus]
A-C-E — Assess, Construct, Evaluate your plan
Cross-tolerance, rotate, reduce by twenty-five percent
Taper slow when function's low, document every trend
Multimodal, methodical, precision till the end
A-C-E — the framework that won't bend
[Verse 2]
Now the kidney's failing, creatinine climbing fast
Morphine-six-glucuronide accumulating — can't let that last
Neurotoxicity knocking, myoclonus at the door
Time to rotate agents, hydromorphone, nothing more
Calculate equianalgesic — morphine sixty oral
Divide by five, twelve milligrams, but hold up, read theoral
Hydromorphone bioavailability shifts the math
Reduce by twenty-five for cross-tolerance on the path
Extended-release format? Scratch it — AKI's the wall
Immediate-release dosing only, frequent intervals y'all
Breakthrough at ten percent of total daily weight
Reassess renal function, titrate, don't hesitate
[Chorus]
A-C-E — Assess, Construct, Evaluate your plan
Cross-tolerance, rotate, reduce by twenty-five percent
Taper slow when function's low, document every trend
Multimodal, methodical, precision till the end
A-C-E — the framework that won't bend
[Bridge]
High-dose oxycodone, no functional gain in sight
Patient's been on it years, dependence wound up tight
You don't cut it cold — that's a physiologic crime
Ten percent reduction weekly, methodical, take your time
Buprenorphine transition or slow methadone assist
Behavioral health on speed dial, the psychosocial grist
PDMP checked, aberrant patterns on the screen
Pain specialist, social work, the whole interdisciplinary team
Document the rationale, the DIRE score, the goals
Informed consent for the taper, patient owns their role
[Verse 3]
Self-assessment time, lay the cases on the scale
Discharge plan — did you anchor non-opioid first detail?
Rotation — did you check the equianalgesic chart precise?
Did you halve the starting dose when tolerance wasn't nice?
Taper schedule — weekly drops, not daily, not a cliff
Function metrics built in — pain scores alone won't shift
Ask yourself what harm looks like before you sign the script
Every calculation written, every rationale equipped
[Chorus]
A-C-E — Assess, Construct, Evaluate your plan
Cross-tolerance, rotate, reduce by twenty-five percent
Taper slow when function's low, document every trend
Multimodal, methodical, precision till the end
A-C-E — the framework that won't bend
42. 1 Principles of Multimodal Analgesia
[Verse 1]
Clinic's packed, patient gripping the chair
Post-op night three, pain everywhere
Reach for the opioid, that's the old reflex
But single-agent thinking leaves you wrecked
See the nervous system ain't a one-lane road
Multiple receptors carrying the load
NMDA, sodium channels, COX cascade
Hit 'em all at once, that's how prescriptions get paid
Multimodal means we diversify
Additive effects when mechanisms multiply
Synergy stacked — two drugs at lower dose
Beat the same pain harder than a single overdose
Opioid-sparing ain't a buzzword, it's the math
Less morphine milligrams, cleaner patient path
Nausea down, constipation drops away
Respiratory drive lives another day
[Chorus]
S-N-A-R — Schedule your non-opioids first
Adjuvants Targeted, keep the mechanism immersed
Regional technique when the anatomy allows
Non-pharm modalities complete the vows
Synergy, sparing, reduced adverse cascade
That's the multimodal framework we've laid
SNARR — burn it in, don't deviate
Four pillars, one regimen, dominate
[Verse 2]
Scheduled acetaminophen, standing dose
Not PRN fluff — around-the-clock it goes
NSAIDs block the COX-2 at the wound
Inflammation tamped before the pain is tuned
Gabapentinoids — calcium channel alpha-two
Dulls the central wind-up coming through
Ketamine sub-anesthetic, NMDA blocked cold
Opioid tolerance prevention — that's the gold
Now adjuvants gotta match the pain's DNA
Neuropathic? Duloxetine's in play
Muscle spasm layer? Cyclobenzaprine
Visceral cramping's got a different gene
Mechanism-targeted means you diagnosed the type
Not shotgun prescribing, surgical and precise
Lidocaine infusion systemic, membrane-stabilized
Central sensitization caught and neutralized
[Chorus]
S-N-A-R — Schedule your non-opioids first
Adjuvants Targeted, keep the mechanism immersed
Regional technique when the anatomy allows
Non-pharm modalities complete the vows
Synergy, sparing, reduced adverse cascade
That's the multimodal framework we've laid
SNARR — burn it in, don't deviate
Four pillars, one regimen, dominate
[Bridge]
Epidural catheter threading the thoracic space
Local anesthetic bathes the operative place
Nerve block pre-procedure — preemptive analgesia
Pain memory never forms, cleaner perioperative era
TAP block, serratus plane, fascia iliaca —
Regional interrupts the afferent signal before it hits the thalamus
Meanwhile TENS electrodes modulate the gate
Cognitive behavioral tools recalibrate
Heat, cold, elevation, movement-based rehab
Physical therapy ain't soft — it's pharmacolab
Sleep hygiene matters — pain threshold amplified
When cortisol spikes from exhaustion, opioids get magnified
So the regimen breathes across all four domains
Biochemical, anatomic, neural, and brain
43. 2 Neuropathic Pain Algorithms
[Verse 1]
Neuropathic pain — the wire's misfiring,
Ectopic discharge, the nerve ain't retiring,
NeuPSIG laid the blueprint, three tiers clear,
First-line agents, let me put 'em in your ear —
TCAs reuptake both the nora and sero,
Duloxetine, venlafaxine — SNRI heroes,
Gabapentin, pregabalin, calcium channel bind,
Alpha-two-delta subunit, quieting the grind,
Paresthesia, allodynia, burning dysesthesia —
Every misfired signal got a clinical sequela
[Chorus]
Prima linea — TCA, SNRI, gabapentinoid,
Seconda linea — topical, tramadol, steroid-void,
Terza linea — strong opioids, botulinum last resort,
Tre livelli — three tiers, memorize the report,
Prima, seconda, terza — ladder's how we climb,
Algorithm's the blueprint, evidence is the paradigm
[Verse 2]
Condition-specific, gotta individualize,
Diabetic neuropathy — duloxetine supervise,
COMBO-DN proved the combo hits different —
Nortriptyline plus gabapentin, synergy efficient,
Postherpetic neuralgia — topical lidocaine patch,
High-concentration capsaicin, vanilloid receptor catch,
Trigeminal neuralgia — carbamazepine's the throne,
Sodium channel blockade, microvascular's the zone,
Chemotherapy-induced? Duloxetine's the move,
Central post-stroke pain — TCA finds its groove
[Chorus]
Prima linea — TCA, SNRI, gabapentinoid,
Seconda linea — topical, tramadol, steroid-void,
Terza linea — strong opioids, botulinum last resort,
Tre livelli — three tiers, memorize the report,
Prima, seconda, terza — ladder's how we climb,
Algorithm's the blueprint, evidence is the paradigm
[Bridge]
Now let me drop a rare word — nociceptive's known,
But the real word here is *causalgia* — that burning moan,
Reflex Sympathetic Dystrophy rebranded CRPS,
Sympathetically maintained, ketamine breaks the stress,
HIV neuropathy — lamotrigine, evidence thin,
Spinal cord injury — pregabalin's discipline,
The second rare word — *paroxysmal*, episodic lightning shot,
Trigeminal volleys, carbamazepine hits the spot,
Botulinum toxin — third-line, peripheral injection,
Blocks presynaptic release, disrupts pain signal projection
[Verse 3]
Combination therapy — the COMBO-DN data's real,
Two agents, different mechanisms, amplified the deal,
Don't just stack drugs chasing additive sedation,
Target distinct pathways — that's rational medication,
Tramadol hits mu-opioid plus monoamine reuptake,
Second-line positioning — weak opioid's the intake,
Strong opioids third because dependence risk is steep,
Opioid-induced hyperalgesia, paradox runs deep,
Titrate slow, assess response, document the function,
Pain scores plus quality of life — that's the real conjunction
[Chorus]
Prima linea — TCA, SNRI, gabapentinoid,
Seconda linea — topical, tramadol, steroid-void,
Terza linea — strong opioids, botulinum last resort,
Tre livelli — three tiers, memorize the report,
Prima, seconda, terza — ladder's how we climb,
Algorithm's the blueprint, evidence is the paradigm
44. 3 Nociplastic and Widespread Pain
[Verse 1]
Central sensitization, the volume knob cranked too loud
Pain without tissue damage, misread signals in the crowd
Nociplastic is the term — not nociceptive, not nerve
A third mechanism, amplified beyond what stimuli deserve
Fibromyalgia leads the pack, widespread tenderness, fatigue
Cognitive fog, disrupted sleep, the body under siege
No structural lesion on the scan, the MRI comes clean
But functional MRI lights up like you've never seen
[Chorus]
Біль без причини — це все ще біль реальний
(Pain without a cause is still pain that's real)
Duloxetine, milnacipran, pregabalin — seal the deal
El dolor es amplificado, el sistema está en llamas
Exercise and CBT, not opioids — esas son las llamas
Biль реальний, sistema en llamas — centrally maintained
Treat the central nervous system, not the periphery you drained
[Verse 2]
Fibromyalgia management — education is the cornerstone
Patients need to understand the mechanism before they're thrown
Into polypharmacy traps — duloxetine SNRIs
Milnacipran runs parallel, pregabalin pacifies
Low-dose amitriptyline helps with sleep architecture
Low-dose naltrexone, emerging evidence, a smaller picture
But here's the cardinal rule carved into every chart —
Avoid opioids in fibromyalgia, they may amplify from the start
Hyperalgesia from chronic opioids — paradoxical, absurd
The drug worsens the condition, the pain signal gets blurred
[Chorus]
Біль без причини — це все ще біль реальний
Duloxetine, milnacipran, pregabalin — seal the deal
El dolor es amplificado, el sistema está en llamas
Exercise and CBT, not opioids — esas son las llamas
Біль реальний, sistema en llamas — centrally maintained
Treat the central nervous system, not the periphery you drained
[Verse 3]
Chronic low back pain — the most prevalent diagnosis on the floor
Guideline-concordant care means exercise knocking at the door
Cognitive behavioral therapy rewires the fear-avoidance loop
Spinal manipulation has a seat at the evidence table too
NSAIDs carry modest benefit — duloxetine shows real data
Acetaminophen? PACE trial buried it — ineffective, see you later
Gabapentinoids: poor evidence, overprescribed, a cautionary tale
Opioids: functional decline and dependency tipping the scale
Muscle relaxants — sedating, habituating, weak on chronic pain
Short-term maybe, long-term never — read the guideline again
[Bridge]
No scan explains the suffering, no lesion maps the weight
Nociplastic pain lives in circuits recalibrated by fate
Спробуй зрозуміти — try to understand the wiring
The drugs that dampen central gain are worth acquiring
SNRIs and neuromodulators — targeted, deliberate
Not a scatter-shot opioid script making patients miserable
Movimiento, educación — muévete, aprende, respira
Exercise rewrites the nervous system — esa es la quimera
45. 4 Non-Pharmacologic Therapies (as they relate to reducing drug burden)
[Verse 1]
Forget the pill first, let the body learn to speak
Non-pharm therapies running four lanes deep
Physical therapy, graded exposure to load
You don't sprint the mountain — you renegotiate the road
Neuroplasticity rewiring every rep
Graded activity means calibrated steps
Exercise prescription, aerobic, strength, and range
The nervous system listens when you systematically change
Peripheral sensitization starts to dial back down
When you move with intention through the pain compound
[Chorus]
Quatro caminhos, nenhum comprimido
Four therapies, the burden gets divided
Corpo e mente — train the central gate
Reduz a carga, reabilita o estado
Physical, psychological, adjunct, sleep — integrate
Quatro caminhos, não precisa esperar
[Verse 2]
Now psychology — this ain't soft science, pay attention
CBT restructures the catastrophization tension
ACT says defuse the thought, don't fight what's in your skull
Mindfulness is interoceptive — feel the signal, not the pull
Pain neuroscience education — that's the vellichor here
Teaching that pain is a protector, not a structural frontier
Vellichor — that wistfulness of knowing something changed
When a patient learns their nervous system got dysregulated, rearranged
And suddenly the fear response starts losing all its grip
That's psychoeducation closing fear-avoidance's tip
[Chorus]
Quatro caminhos, nenhum comprimido
Four therapies, the burden gets divided
Corpo e mente — train the central gate
Reduz a carga, reabilita o estado
Physical, psychological, adjunct, sleep — integrate
Quatro caminhos, não precisa esperar
[Verse 3]
TENS modulates via gate control, dorsal horn suppression
Acupuncture — appraise the evidence, moderate the expression
Sham-controlled trials show specific effects are murky
But contextual analgesia runs the whole circuit, working
Heat relaxes muscle spindles, cuts the guarding reflex tight
Cold vasoconstricts acute inflammation overnight
Adjunct tools — not anchors — temporary scaffolding
The goal is always function, not eternal coddling
[Bridge]
Sleep deprivation amplifies the nociceptive gain
Poor sleep architecture is prolific fuel for pain
Optimize the circadian rhythm, cut the hyperarousal
Sleep hygiene plus CBT-I — that's the real arousal
And when everything converges — interdisciplinary
Physicians, psychologists, physio, occupational boundary
The program targets catastrophizing, guarding, and avoidance
Polypharmacy retreats when you coordinate that alliance
Soporific habits replaced by structured restoration
That's the second rare word — sedating every medication
[Chorus]
Quatro caminhos, nenhum comprimido
Four therapies, the burden gets divided
Corpo e mente — train the central gate
Reduz a carga, reabilita o estado
Physical, psychological, adjunct, sleep — integrate
Quatro caminhos, não precisa esperar
46. Self-Assessment
[Verse 1]
Diabetic neuropathy, burning like a circuit fused,
CKD in the picture, gotta pick the meds you use,
Depression riding shotgun, triple threat on board,
Stepwise regimen, let's lay it on the floor —
First line: SNRIs, duloxetine's your call,
Treats the nerve pain AND the mood, one drug handles all,
Renally dosed with caution when the GFR drops low,
Pregabalin's your adjunct but you ease it slow —
Gabapentinoids accumulate when kidneys can't excrete,
Dose-reduce or toxicity'll knock the patient off their feet,
Topical lidocaine, capsaicin on the skin,
Localized relief, no systemic origin,
Tramadol? Hold up — serotonin syndrome risk,
With duloxetine on deck, that combo's too brisk,
TCAs like amitriptyline? Anticholinergic load,
CKD and elderly don't need that heavy road
[Chorus]
¡Escucha bien, no es complicado!
Duloxetine primero, renalmente dosificado,
Pregabalin second, titrate it slow,
Topicals for local pain, that's how we go —
Stepwise, stepwise, build the scaffold right,
CKD plus depression, you gotta be precise tonight —
¡Dale con cuidado, trata el dolor con arte!
Kidney function guides every single part
[Verse 2]
Now flip the chart — fibromyalgia walks in the room,
Central sensitization, pain amplified in the gloom,
The patient asks for opioids, "Doc, I need the strong stuff,"
Here's where education is the sharpest clinical bluff —
Opioids in fibromyalgia worsen central gain,
Opioid-induced hyperalgesia — MORE drug, MORE pain,
The mu-receptor flooding throws the descending system off,
The inhibitory pathways weaken, and the suffering stays aloft —
Allopathic logic fails when the mechanism's central,
You can't peripheral-block a signal that's neurological, sequential —
The brain's alarm won't quiet down with morphine in the veins,
It amplifies the crosstalk through the dorsal horn domains
[Chorus]
¡Escucha bien, no es complicado!
Duloxetine primero, renalmente dosificado,
Pregabalin second, titrate it slow,
Topicals for local pain, that's how we go —
Stepwise, stepwise, build the scaffold right,
CKD plus depression, you gotta be precise tonight —
¡Dale con cuidado, trata el dolor con arte!
Kidney function guides every single part
[Bridge]
Here's your rare word for the day — hyperkatifeia,
The emotional agony of opioid withdrawal's sequela,
When you stop the opioids cold, dysphoria sweeps in hard,
That's hyperkatifeia — suffering leaving its scar —
For fibromyalgia patients, that exit cost is steep,
Dependency builds fast while pain relief stays weak —
Exercise and CBT restructure the central map,
SNRIs and pregabalin close the sensitization gap,
No opioids — say it clearly — no opioids for this,
The mechanism doesn't match, the evidence won't miss
47. 1 Preoperative Planning
[Verse 1]
Before the blade ever touches skin, we strategize the plan,
Risk stratification first — gotta understand the span,
Who's walking in with catastrophizing, anxiety, prior chronic pain?
Somatization, opioid history, psych comorbid chains,
Procedure type matters — thoracotomy versus lap chole, see the gap,
Persistent postsurgical pain probability mapped on a chart,
We score them high or low before they ever hit the cart,
PROSPECT guidelines whispering procedure-specific art
[Chorus]
Preop planning, stratify the score,
Opioid-tolerant patients need a whole lot more,
Acetaminophen and NSAIDs loaded up before,
Gabapentinoids — reappraise before you pour,
Buprenorphine continued, methadone — don't ignore,
PROSPECT tells the trajectory, set expectations at the door,
Preop planning — stratify the score
[Verse 2]
Opioid-tolerant patient rolls through registration slow,
Baseline morphine equivalents running triple digits, though,
Standard multimodal won't scratch the tolerance ceiling here,
Continue their home dose, add regional blocks crystal clear,
Methadone — keep it going, cardiac QT on the screen,
Buprenorphine partial agonist debated in between,
Some say continue full dose, some say taper down low,
2021 consensus leans toward keeping the flow
[Chorus]
Preop planning, stratify the score,
Opioid-tolerant patients need a whole lot more,
Acetaminophen and NSAIDs loaded up before,
Gabapentinoids — reappraise before you pour,
Buprenorphine continued, methadone — don't ignore,
PROSPECT tells the trajectory, set expectations at the door,
Preop planning — stratify the score
[Verse 3]
Gabapentinoids had their golden era running wild,
Every protocol stacking pregabalin profile,
But sedation, dizziness, respiratory risk piled high,
Elderly patients stumbling — now we scrutinize the why,
Reappraise — don't reflexively prescribe the standard dose,
Select the patient carefully, pick the cases where it's close,
Acetaminophen preloading — IV or oral, either track,
COX-2 selective or nonselective NSAID stacking back
[Bridge]
Patient education — the conversation surgeons skip,
Tell them where the pain curve peaks and when it'll dip,
Knee replacement hurts hardest day one through three,
Hemorrhoidectomy lingers past the week, believe,
Inguinal hernia resolves quick — here's the map,
Set the expectation or they spiral in the gap,
Catastrophizing magnifies the signal from the nerve,
Address it preoperatively — that's the curve we serve
[Chorus]
Preop planning, stratify the score,
Opioid-tolerant patients need a whole lot more,
Acetaminophen and NSAIDs loaded up before,
Gabapentinoids — reappraise before you pour,
Buprenorphine continued, methadone — don't ignore,
PROSPECT tells the trajectory, set expectations at the door,
Preop planning — stratify the score
48. 2 Intraoperative Techniques
[Verse 1]
Step into the OR, got a strategy to frame,
Opioid-sparing anesthesia, we changing up the game,
Remifentanil's quick but leave a paradox behind,
Hyperalgesia creeping in, sensitizing every spine,
The mu-receptor floods and then the rebound pain ascends,
So we blunt that NMDA storm before the case even ends,
Ketamine's the sentinel, sub-anesthetic dose,
Blocking wind-up pathways, keeping nociception close,
Systemic lidocaine dripping through the line with grace,
Anti-inflammatory, cutting ileus out the place,
Dexmedetomidine riding on the alpha-two receptor site,
Sedation without suppression, keeping breathing tight,
Magnesium chelates calcium, stabilizing every nerve,
Adjuvants stacking synergy — that's the protocol we serve
[Chorus]
K-L-D-M, remember every name,
Ketamine, Lidocaine, Dex, Magnesium — tame the pain,
Opioid-sparing, neuraxial maintaining,
ERAS components, multimodal reigning,
Wound infiltration, surgeon blocking the plane,
TAP and rectus sheath cutting through the strain,
K-L-D-M, carve it in your brain,
Adjuvants plus regional — that's how we contain
[Verse 2]
Now pivot to the neuraxial, epidural in the space,
Thoracic level threading, putting opioids in their place,
ERAS protocols demanding we reduce systemic load,
Spinal plus intrathecal morphine walking down that road,
Peripheral nerve blocks flanking like a tactical brigade,
Bupivacaine or ropivacaine, the long-acting cascade,
Continuous catheter infusions holding postop pain,
Cutting through the cortisol, abolishing the strain,
Attenuate the surgical stress response at the source,
Blunt that sympathetic surge and steady up the course,
Regional techniques aren't supplemental, they're the core,
Neuraxial analgesia is what ERAS protocols adore
[Bridge]
Here's a word — nociceptive plethora — a stunning surplus of pain signals flooding gates,
We don't overwhelm the system, we anticipate those states,
Preemptive, multimodal, every layer checked,
The anesthesiologist as architect
[Verse 3]
Surgeon steps in close, the case is almost done,
Wound infiltration laid before the closure's begun,
Long-acting local, bupivacaine beneath the fascia plane,
Soaking nerve endings before the patient wakes to rain,
TAP block — transversus abdominis plane — the surgeon maps the wall,
Between internal oblique and transversus, catching nerves that crawl,
T-seven down to twelve, the somatic fibers trapped,
Rectus sheath block threading midline, ventral coverage unwrapped,
Surgeon-administered blocks democratize the skill,
No anesthesiologist required — the team can fit the bill,
Infiltration, TAP, rectus sheath in concert sealed,
Opioids retreating from the postoperative field
49. 3 Postoperative Management
[Verse 1]
Post-op floor, patient wired to the PCA pump
Demand dose dialed, lockout sixty minutes — no shortcuts
Basal infusion? Careful now, that's a treacherous lane
OSA patient sleeping heavy, basal amplifies the pain
Of respiratory risk — so screen before you prescribe
Select the right candidate, cognitively alive
Can press the button, understand the concept, willing to comply
Monitor sedation scores before you even say goodbye
Epidural threading up the lumbar — bupivacaine low-dose
Fentanyl adjuvant cutting through the visceral ghost
Hypotension drops — bolus fluids, phenylephrine stands by
Check anticoagulation timing or the hematoma multiplies
ASRA guidelines — twelve hours off the heparin drip
Twenty-four for low molecular weight before you let it rip
Neurologic checks every four hours, no exceptions made
Motor block assessment — if it's dense, somebody's afraid
[Chorus]
Cuidado, cuidado — monitora a respiração
POSS score three or four — hit the Narcan, chame atenção
Multimodal regime — acetaminophen, NSAID, nerve block in the game
Capnografia não mente, waveform fading is a flame
Cuidado, cuidado — we managing this pain
Oral transition, epidural out — discharge ain't the same
Descarte o opioide — lockbox, take-back, explain
Cuidado, cuidado — monitora a respiração
[Verse 2]
POSS — Pasero Opioid-induced Sedation Scale
One is drowsy, two is heavy, three means you turn pale
Four is unarousable — call rapid, don't deliberate
Capnography waveform flattening — intervene, don't wait
High-risk population cluster: elderly, renally impaired
Obese with neck circumference that's got the airway snared
Concurrent benzos, gabapentin stacking sedative load
These patients need continuous pulse ox down that postop road
Scheduled multimodal oral — acetaminophen every six
NSAID around the clock unless the creatinine conflicts
Adjuvants — gabapentin, duloxetine, lidocaine patch
Opioid as the rescue, not the anchor of the batch
Inadequate analgesia? Reassess the source of pain
Surgical complication hiding underneath the plain
Constipation, nausea, itch — address each side effect clean
Methylnaltrexone for the bowel, ondansetron between
[Bridge]
Epidural out at forty-eight, oral regimen begins
Transition overlapping — don't abandon patients thin
On coverage — bridge with short-acting, titrate to effect
Calculate the prior IV morphine equivalent, reflect
Then convert to extended-release with a twenty-five percent
Reduction for cross-tolerance — that's the safety argument
[Verse 3]
Discharge day — don't hand a script without the education
Lowest effective dose, shortest duration, no deviation
Disposal matters — DEA take-back, activated charcoal pouch
Lock the medication, keep it out of reach inside the house
Counsel every patient — don't share, don't crush, don't snort
Document the conversation, that's your medicolegal fort
50. 4 Specific Acute Pain Scenarios
[Verse 1]
Trauma rolls in, burns covering the chest wall
Rib fractures plural, one bad breath can make you fall
Splinting every inhale, atelectasis creeping in
Regional's the weapon — thoracic epidural wins
Intercostal blocks, paravertebral, keep the lungs awake
Systemic opioids solo? That's a respiratory mistake
Multimodal stacking so the ventilation stays intact
Nerve catheters over narcotics — that's the clinical fact
[Chorus]
Cuatro escenarios, aprende bien
Trauma, células falciformes, el páncreas también
Cólico renal — los NSAIDs son el rey
ED stewardship, keep the tolerance in play
Cuatro escenarios, no los olvides
Individualiza, evalúa, y decides
[Verse 2]
Sickle cell crisis, the vessels clamp like a fist
Vaso-occlusive pain — don't put meperidine on the list
Normeperidine accumulates, seizures on the way
Individualized protocols, reassess without delay
Titrate IV opioids fast, thirty-minute check again
Hydromorphone or morphine, document the patient's baseline then
Warm compresses, hydration, NSAIDs bridging through
Rapid cycling reassessment — that's the protocol due
[Chorus]
Cuatro escenarios, aprende bien
Trauma, células falciformes, el páncreas también
Cólico renal — los NSAIDs son el rey
ED stewardship, keep the tolerance in play
Cuatro escenarios, no los olvides
Individualiza, evalúa, y decides
[Verse 3]
Pancreatitis burning through the retroperitoneal space
Renal colic squeezing, ketorolac takes first place
NSAIDs plus acetaminophen — the combo beats the pill
Acute low back pain, migraine, dental — same drill
Triptans for the cluster, NSAIDs kill the tooth
Opioids inferior for these — science gives the proof
Emergency department, steward every script you write
Functional restoration matters more than chasing analgesia height
[Bridge]
Ahora el paciente tolerante — baseline dose must stay
Add multimodal layers, don't just yank the med away
Higher breakthrough thresholds, the receptors saturated deep
Avoid the partial agonist — buprenorphine complicates the leap
Unless it's planned: continue bupe, split the daily dose
Add full agonist on top — titrate cautious, diagnose
Methadone patients keep their maintenance, don't withhold
QTc monitoring, interactions — read every fold
[Chorus]
Cuatro escenarios, aprende bien
Trauma, células falciformes, el páncreas también
Cólico renal — los NSAIDs son el rey
ED stewardship, keep the tolerance in play
Cuatro escenarios, no los olvides
Individualiza, evalúa, y decides
[Outro]
Regional blocks sobre la morfina sola
Sickle cell — meperidina, ninguna, ni una gota
NSAIDs primero cuando el diagnóstico te llama
Tolerate the tolerance — individualize the schema
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