Lead augmented vector right (aVR) is a useful measure in the diagnosis of ST-segment elevation acute myocardial infarction (STEMI ... of the proximal preseptal left anterior descending artery.

Frequently, a left bundle branch block is seen on the ECG during left main occlusion, however changes of an anterior myocardial infarction may ... elevation in lead aVR greater than the ST ...

or even in the left main coronary artery. This large myocardial infarction is termed an "extensive anterior." The ECG findings of an anterior ST segment elevation myocardial infarction include ...