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Inferior STEMI — RACP Adult Medicine MCQ

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EasyCardiologyInferior STEMIRACP Adult Medicine

A 72-year-old man presents with acute chest pain and ST elevation in leads II, III, and aVF. He is haemodynamically stable. Coronary angiography reveals a culprit lesion in the right coronary artery. Which vessel is most likely occluded?

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Correct answer: A — Right coronary artery

ST elevation in leads II, III, and aVF indicates inferior STEMI, which is most commonly caused by occlusion of the right coronary artery (approximately 80% of cases). The RCA supplies the inferior wall of the left ventricle in the majority of patients with right-dominant circulation.

Reference: CSANZ – 2025 – ACS Guidelines