A 62-year-old man presents with crushing substernal chest pain radiating to the left arm that began while shoveling snow. ECG shows ST-segment elevation in leads II, III, and aVF. Which coronary artery is most likely occluded?
Practise this USMLE Step 1 Medical Prep question free, then download the PDF, watch the video walkthrough, or unlock timed mock exams for the full web bank.
✓ Correct answer: C. Right coronary arteryST-segment elevation in leads II, III, and aVF indicates an inferior wall myocardial infarction, which typically results from occlusion of the right coronary artery (RCA). The RCA supplies the inferior wall of the left ventricle in approximately 80% of people (right-dominant circulation).
Keep practising. Use the free USMLE Step 1 Medical Prep PDF, watch the YouTube walkthrough, or unlock all 10 web questions with timed mock exams.
Free practice here. Timed mocks when you are ready.
Study the USMLE Step 1 Medical Prep free question explanations, download the PDF, then unlock timed mock exams on the web when you want exam-day practice.
Theory