Simini Boards Cast
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Simini Boards Cast
Chapter 116 - Part C: Pressure Wins: Rupture, Obstruction, and Uroabdomen
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In this BoardsCast episode, we continue Tobias Chapter 116 — Bladder with the most important reframe in uroabdomen:
The rupture doesn’t kill the patient. The potassium does. The acidosis does. The cardiovascular collapse does.
A bladder is a pressure vessel. When an obstruction (classic blocked cat) drives intravesicular pressure high enough, it doesn’t “pop like a balloon” from volume — it ischemia-kills the wall by crushing blood supply. That devitalized tissue (most commonly at the apex) necroses, fails, and urine escapes into the abdomen.
Once urine is in the peritoneal cavity, the abdomen becomes a giant dialysis membrane: solutes and toxins move back into circulation. That’s uroabdomen — and the killer metabolic derailment is hyperkalemia, which drives bradycardia, arrhythmias, and arrest.
This episode gives you the board-safe sequence:
Pressure rises → tissue dies → urine leaks → potassium rises → the heart fails.
You’ll learn:
- Why does obstruction cause rupture via ischemia/necrosis, not simple overdistension
- Why the apex is the usual failure point (end of the blood supply line)
- The “reverse kidney rule”: abdominal fluid creatinine > serum creatinine supports uroabdomen
- Why you stabilize first: fix physiology before anatomy (hyperkalemia + anesthesia = dead patient)
- Surgical rules: resect devitalized bladder wall, close in healthy tissue, decompress, and omentalize for biologic sealing and blood supply
Key takeaway: Pressure is the disease. The hole is just how you notice it.
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