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CFM Cardiology Practice Test

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The right coronary artery perfuses the AV node in approximately what percentage?
Correct Answer:
AV node (90%)
Explanation:
The blood supply to the AV node almost always comes from the AV nodal artery, which typically branches off the right coronary artery. In about 90% of individuals, this RCA-derived supply perfuses the AV node, making that location the most common source. The SA node has its own nodal artery that often comes from the RCA in roughly half to two-thirds of people, with variation, and the inferior LV or RV walls are supplied by other branches depending on coronary dominance. Because the AV nodal artery is most often RCA-derived and provides the AV node’s blood supply in about 90% of cases, that option best matches the usual anatomy.

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