[Verse 1] Fentanyl drips into the line, a hundred times past morphine's climb Lipophilic, fast to cross the brain, binds mu receptors, dulls the pain Sufentanil — ten times stronger still, the ICU's familiar chill Short procedures call for alfentanil's speed, context-sensitive kinetics plant the seed Remifentanil, ester-cleaved by blood and tissue, metabolized before you blink No organ needed, plasma esterases do the work, gone faster than you'd think But pull that infusion, watch the patient wake to agony — hyperalgesia's sting Pre-emptive multimodal cover or you'll hear the postop suffering [Chorus] Fent, sufent, remi, alfent — mu receptor melody Context-sensitive half-times shift with infusion history Morphine, hydromorphone, meperidine, methadone in the mix Know your opioid, know your patient, know your fix [Verse 2] Context-sensitive half-time — not elimination, don't confuse the two The longer that you run the drug, redistribution changes what it'll do Remifentanil stays flat across the clock, fentanyl curves steep with time Morphine's active metabolite accumulates in renal decline Chest wall rigidity — the wooden chest, it comes with bolus, comes with speed Fentanyl and sufentanil, high-dose induction, watch the patient freeze Succinylcholine breaks the lock, or naloxone if you dare reverse Ventilate them manually first, then troubleshoot the universe [Chorus] Fent, sufent, remi, alfent — mu receptor melody Context-sensitive half-times shift with infusion history Morphine, hydromorphone, meperidine, methadone in the mix Know your opioid, know your patient, know your fix [Verse 3] Neuraxial opioids — intrathecal morphine's the gold standard post-op tool Rostral spread to respiratory centers, apnea monitoring's the rule Lipophilic remi and fentanyl stay segmental, hydrophilic morphine roams Pruritus, nausea, urinary retention — the neuraxial side-effect homes Naloxone titration — twenty-five to forty micrograms at a time Too much reversal crashes analgesia, triggers withdrawal, dysrhythmia rhyme Drip it slow, redose with caution, half-life's shorter than the opioid's hold Renarcotization will come back and bite — the textbooks told you so [Bridge] Opioid-free, opioid-sparing — not a trend, it's mechanism Ketamine blocks NMDA, dexmedetomidine quiets the system Lidocaine infusions, NSAIDs, dexamethasone, regional nerve block Tap the multimodal toolkit, reduce receptor overlock Because every opioid given seeds a postoperative cost — PONV, ileus, tolerance, the recovery days lost [Chorus] Fent, sufent, remi, alfent — mu receptor melody Context-sensitive half-times shift with infusion history Morphine, hydromorphone, meperidine, methadone in the mix Know your opioid, know your patient, know your fix
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