Which artery determines coronary dominance?

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Multiple Choice

Which artery determines coronary dominance?

Explanation:
Coronary dominance is defined by which artery gives rise to the posterior descending (posterior interventricular) artery as it runs in the posterior interventricular sulcus. That vessel—the posterior interventricular artery—determines dominance because its origin specifies whether the PDA comes from the right coronary artery (right-dominant pattern) or from the left coronary system (left-dominant pattern, via the circumflex). In other words, the key determinant is the origin of the posterior interventricular artery, since it is the artery that supplies the PDA to the inferior heart wall.

Coronary dominance is defined by which artery gives rise to the posterior descending (posterior interventricular) artery as it runs in the posterior interventricular sulcus. That vessel—the posterior interventricular artery—determines dominance because its origin specifies whether the PDA comes from the right coronary artery (right-dominant pattern) or from the left coronary system (left-dominant pattern, via the circumflex). In other words, the key determinant is the origin of the posterior interventricular artery, since it is the artery that supplies the PDA to the inferior heart wall.

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