Anatomy - Occlusion in the LAD distal to both the first septal branch and the first diagonal branch

An occlusion distal to both the first septal branch and the first diagonal branch results in an ischemia vector pointing to the left and inferiorly. Consequently, ST elevation appears in the inferior leads II, III, and aVF. Since the ischemia vector points predominantly to the direction of the positive pole of lead II the amplitude of ST elevation in lead II is greater than in lead III.

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