Anatomy - LAD Occlusion

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An occlusion proximal to the first septal branch and the first diagonal branch results in ischemia of the superior region of left ventricle, the largest portion of the ventricular muscle mass. In this case, the ischemia vector in the frontal plane points superiorly at an angle of about -90 degrees. Consequently, this results in ST depression in leads II, III, and aVF, isoelectric ST segment in lead I, and ST elevation in leads aVR and aVL.

 

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