Simini Boards Cast
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🎧 Audio-based learning for passive study
✂️ Practical relevance for surgical application
🧠 Flashcard-style recaps + board-style questions
📈 Designed with resident + program director input
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Simini Boards Cast
Chapter 114 - Part B: When Flow Dies: Shock, Ischemia, and Acute Kidney Failure
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In this BoardsCast episode, we continue Tobias Chapter 114 — Kidneys with the paradigm shift that makes AKI predictable:
The kidney doesn’t fail because it’s weak. It fails because flow stopped.
Most people think acute kidney injury is a lab diagnosis—“creatinine is up, so kidneys are failing.” But creatinine is a delayed surrender. By the time it rises, the real battle inside the kidney has already been fought: perfusion dropped, oxygen delivery failed, and the tubular “factory” lost power.
We build the core sequence you need for boards and the ICU:
Low flow → autoregulation fails → GFR drops → ischemia → tubular ATP collapse → acute tubular necrosis (ATN).
You’ll learn:
- Why kidneys are so vulnerable: huge blood flow demand, low oxygen reserve (especially medulla)
- Why autoregulation is a bridge, not immunity—especially in older/diseased kidneys
- Why NSAIDs are dangerous during low-flow states (they block prostaglandins that keep afferent flow open)
- What ATN really is: tubular cells run out of ATP, swell, die, slough, and physically clog the pipe
- The monitoring truth: oliguria precedes azotemia—urine output whispers before creatinine screams
Key takeaway: Creatinine tells you what already happened. Perfusion tells you what’s happening.
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