Simini Boards Cast
The Simini Boards-Cast is the go-to audio study tool for small animal surgery residents prepping for board exams.
Each episode simplifies high-yield surgical content from trusted sources — built to help you pass faster and with less stress.
🎧 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 103 - Part B: The Oxygen Problem Isn’t Airflow: Diffusion Mechanics
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In this BoardsCast episode, we continue Tobias Chapter 103 — Lungs by confronting the ICU trap everyone falls into:
You crank FiO₂ to 100%, you increase ventilation, and the patient is still hypoxemic.
Because you’re trying to treat an oxygen-transfer problem with an airflow solution.
This episode rebuilds hypoxemia into a board-clean classification framework:
All hypoxemia comes from 5 mechanisms — and each one needs a different fix.
You’ll learn:
- The 5 causes of hypoxemia (not 50): low FiO₂, hypoventilation, diffusion impairment, V/Q mismatch, shunt
- Why panting can still be hypoventilation (effort ≠ alveolar ventilation; dead space trap)
- Fick’s Law in plain language: surface area, gradient, thickness, gas properties
- Why O₂ fails before CO₂: CO₂ diffuses ~20× faster (sprinter vs slow walker)
- The bedside decision tools: CO₂ first (hypoventilation = CO₂ high), then A–a gradient to prove gas-exchange failure
- The defining clue: hypoxemia resistant to 100% O₂ = true shunt until proven otherwise
Key takeaway: Ventilation treats CO₂. Diffusion determines O₂.
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