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Cardiovascular SystemQuestion 14 of 50
01:45 remaining

A 54-year-old man comes to the clinic complaining of crushing substernal chest pain radiating to his left arm for the past 2 hours. An electrocardiogram (ECG) shows ST-elevation in leads II, III, and aVF. Which of the following coronary arteries is most likely occluded?

A. Left anterior descending artery (LAD)
B. Right coronary artery (RCA)
✓
C. Left circumflex artery (LCx)
High-Yield Rationale Breakdown

Correct Answer (B): Leads II, III, and aVF view the inferior wall of the left ventricle. The inferior wall is supplied by the Right Coronary Artery (RCA) in about 85-90% of individuals (right-dominant circulation).

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