[Verse 1]
Start at the conus, muscular cone they call infundibulum,
Smooth-walled chamber, free wall built like a vestibule for blood.
Tricuspid's close but never touching — architecture's rule,
Ventriculo-infundibular fold's the wall that keeps it cool.
Climb the chamber, cross the ring, that's the pulmonary annulus,
Valve house of the exit door, where the conduit's handling us.
Push on through the trunk, ride it to the bifurcation,
Left and right PA split — that's your final destination.
[Chorus]
Infundibulum to bifurcation, trace the tract, know the station,
VIF's the wall of separation, tricuspid's safe from annulus invasion.
Pulmonary's front and left, aorta's tucked in back and right,
Left main and the LAD run posterior — squeeze 'em and you're in a fight.
[Verse 2]
Now zoom out, picture both great roots standing side by side,
Pulmonary sits anterior, leftward lean, can't hide.
Aortic root's behind it, tucked in close, intimate neighbors,
Left main artery and proximal LAD doing quiet labors
Just posterior, inferior, running underneath the stage —
Stretch a stent, place a conduit wrong, you've opened up a cage
Around the vessel feeding half the heart its oxygen,
That's why we balloon-test coronaries before we ever begin.
[Chorus]
Infundibulum to bifurcation, trace the tract, know the station,
VIF's the wall of separation, tricuspid's safe from annulus invasion.
Pulmonary's front and left, aorta's tucked in back and right,
Left main and the LAD run posterior — squeeze 'em and you're in a fight.
[Verse 3]
RV's no bully, it's a crescent wrapped around the septum,
Three to five millimeters thin — don't go and overstep 'em.
Built for low impedance flow, a lazy winding river,
Give it volume, it'll stretch; give it pressure, it'll shiver.
Most conduit kids got no native valve left in the socket,
Surgeon cut it out or it regressed — empty like a locket.
So the conduit valve alone stands guard against the backflow,
One leaflet system, all the weight, nothing left to catch below.
[Chorus]
Infundibulum to bifurcation, trace the tract, know the station,
VIF's the wall of separation, tricuspid's safe from annulus invasion.
Pulmonary's front and left, aorta's tucked in back and right,
Left main and the LAD run posterior — squeeze 'em and you're in a fight.
[Bridge]
Same old landmarks, different day —
Redo sternotomy, saw blade creeping, mapping where the vessels lay.
Coronary compression testing, balloon up before you stent,
Proximal anastomosis placed where the old root bent.
Know the fold, know the lean, know the millimeters of the wall,
Anatomy won't bend for you — you learn it, that's your call.
[Outro]
Infundibulum, annulus, bifurcation site,
Anterior-left pulmonary, coronary just in sight.
Crescent, thin, and volume-loving, conduit valve alone,
That's the right ventricular outflow — now the map is known.