Simini Boards Cast
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Simini Boards Cast
Chapter 117 - Part A: Flow vs Resistance: The Urethra as a Dynamic Outflow System
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In this BoardsCast episode, we start Tobias Chapter 117 — Urethra by flipping the urinary tract model the right way up:
The bladder generates pressure. The urethra decides whether urine moves.
So urinary function isn’t “does the bladder contract?” It’s a physics fight:
- Urination happens when bladder pressure > urethral resistance
- Continence happens when urethral closure pressure > bladder pressure
We break down the urethra as an actively controlled resistance regulator (not passive plumbing), then map the species/sex anatomy that explains why some patients leak and others block:
- Female dogs: short (7–10 cm), wider (~0.5 cm), more collagen/less muscle → continence vulnerability
- Male dogs: long and obstruction-prone anatomy (prostate, os penis)
- Male cats: the anatomy trap — distal urethra narrows to ~0.7 mm, making tiny changes in radius catastrophic
Then we connect that anatomy to why partial obstruction can still mean functional “zero flow” (Poiseuille’s law) and why the real killer in obstruction isn’t the bladder—it’s the systemic cascade (hyperkalemia, acidemia, azotemia).
Key takeaway: Every urinary case is pressure vs resistance. Diagnose which side is winning.
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