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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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