USMLE® Step 1 Question of the Day: AV Block - Osmosis Blog
USMLE® Step 1 Question of the Day: AV Block - Osmosis Blog
Dec 8, 2021
osmosis.org
This patient presents with ST-segment elevations in leads II, III, and aVF, which are indicative of an inferior myocardial infarction (MI). Inferior MI typically results from occlusion of the right coronary artery (RCA) in most individuals. The RCA supplies the inferior wall of the left ventricle, as well as the right atrium, right ventricle, sinoatrial (SA) node (in 60% of people), and atrioventricular (AV) node (in 80% of people). RCA occlusion can also lead to bradycardia or heart block due t
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This patient presents with ST-segment elevations in leads II, III, …
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USMLE® Step 2 CK Question of the Day: Second Degree Mobitz type II AV block - Osmosis Blog
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May 4, 2022
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Catching a 3rd Degree AV Block on an ECG A 3rd degree AV block (complete heart block) is electrical divorce between the atria and ventricles. What is a 3rd Degree AV Block? In a normal heart, the atria and ventricles work in sync — the SA node fires, the AV node passes it along, and the ventricles contract. In 3rd degree block, that connection is completely lost. ✅ Atria fire on their own (P waves from the SA node) ✅ Ventricles fire on their own (escape rhythm from AV junction or below) 🚫 But t
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Catching a 3rd Degree AV Block on an ECG A 3rd degree AV block (co…
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