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ST elevation in II, III and aVF
Medicine · exam-style practice question with explanation
A 54-year-old man has crushing chest pain. His ECG shows ST elevation in leads II, III and aVF. Which artery is most likely blocked?
- A. Left anterior descending artery
- B. Left circumflex artery
- C. Right coronary artery
- D. Left main stem
Show the answer and explanation
Answer: C. Right coronary artery
Leads II, III and aVF look at the inferior wall of the heart, which in most people is supplied by the right coronary artery. Inferior MIs can cause bradycardia and heart block, because the RCA usually supplies the AV node. Check right-sided leads for right ventricular involvement.
Key point: Inferior leads II, III, aVF: usually the right coronary artery.
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