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Cardiology MCQ – Acute Myocardial Infarction

 Question

A 60-year-old man presents with sudden severe chest pain radiating to his left arm. ECG shows ST-segment elevation in leads II, III, and aVF. Which coronary artery is most likely occluded?

A. Left anterior descending artery (LAD)

B. Right coronary artery (RCA)

C. Left circumflex artery (LCx)

D. Posterior descending artery (PDA)

Answer

B. Right coronary artery (RCA)

Explanation

ST elevation in II, III, and aVF indicates an inferior wall myocardial infarction.

The RCA typically supplies the inferior wall of the heart.

LAD usually causes anterior wall MI (V1–V4), LCx causes lateral wall MI (I, aVL, V5–V6).

Early recognition is crucial for reperfusion therapy.


Inferior wall MI



Key Point

Inferior MI → ST elevation in II, III, aVF → RCA occlusion.

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