[Verse 1] (Male) Lesson one was clean: two loops, never crossing, RA feeds RV, pulmonary door, no tossing, LA feeds LV, aortic door, straight to the body, Two lanes, two valves, separate and steady. (Female) Rewrite the diagram, watch the wiring fail— RV and LV both dumping through one rail, No wall between them, just a hole called VSD, Mixing bowl of chambers, one truncal valve, one key. [Chorus] Two ventricles, one door, that's the tell, Truncus means the split never fell in place— One trunk splits three ways, hear the mnemonic swell: Lungs, body, heart — one root, one face. RPA, LPA, ostia carved like twins, Arch keeps rolling, coronary river begins. One vessel wearing three different skins. [Verse 2] (Female) Follow the blend past the truncal gate, Oxygen-rich, oxygen-poor, sharing one plate, Purple-tinted lips, a whisper not a shout, Mild cyanosis — the mixing giving it out. (Male) No pulmonary valve standing sentry at the door, So lung vessels catch pressure meant for the shore Of the aorta — systemic force unchecked, A flood in miniature, a nursery wreck. [Verse 3] (Male) Weeks one through six, the lung resistance drops, Blood that should trickle now absolutely never stops, Fast little breaths, feeding turns to a fight, Growth curve stalling — heart failure by candlelight. (Female) This is the hinge, the reason surgeons race the clock, Untreated, arterioles harden, thicken, lock — Sclerotic little tunnels, defensive and irreversible, Mortality was brutal, eighty percent, incorrigible. [Chorus] Two ventricles, one door, that's the tell, Truncus means the split never fell in place— One trunk splits three ways, hear the mnemonic swell: Lungs, body, heart — one root, one face. RPA, LPA, ostia carved like twins, Arch keeps rolling, coronary river begins. One vessel wearing three different skins. [Verse 4] (Male) Echo shows the straddle, one vessel overriding wide, Catheter confirms the pressures equalized inside, Four types by Collett, branching tells the tale, Type one splits early, type three sends the lungs a separate rail. (Female) Surgeons map the coronaries before they cut the trunk, Homograft conduit rises where the pulmonary sunk, Rastelli's legacy lives on in every stitch, Turning one river into two, closing up the ditch. [Bridge] (Male, urgent) Neonatal window, no lingering, no maybe— (Female, tense) Cut before the vessels calcify like old rope, Before the flood becomes an inexorable slope, Repair the fork the embryo forgot to make. (Both) One trunk, three roads — fix it before it's too late. [Outro] (Female, fading) RA, RV — VSD — one truncal gate, Lungs and body and heart share a single fate. (Male) Ostia open, arch bends round the bay — One river, three mouths, cut it clean today.
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