Podcast summary
USMLE Step 2/3: High-Yield Review — Ep 138
Use single clues to trigger diagnoses
Exam questions often hinge on mechanistic “equivalents”: degraded von Willebrand in Heyde’s, occult JVP absence in tamponade, new LBBB as STEMI-equivalent, and normal A–a gradient in hypoventilation not lung disease.
Heyde’s links aortic stenosis to bleeding
Severe calcific aortic stenosis can cause acquired von Willebrand multimers loss via valve-mediated cleavage, breaking platelet-plug formation and presenting as GI bleeding that resolves with valve replacement.
Normal A–a gradient reframes hypoxia cause
When hypoxia occurs with a normal A–a gradient, lung diffusion is intact; hypoxia stems from hypoventilation (e.g., benzo/opioid overdose, neuromuscular weakness), so PaCO2 should be elevated with respiratory acidosis.
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