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Abstract Severe coronary artery diseases include acute complete or subtotal occlusion of left main coronary artery(LMCA) and 3vessel disease(3vd). Although the patients with acute complete occlusion of LMCA rarely arrive to hospital alive, the specificity and accuracy rate of ST segment elevation in lead aVR are both above 80%. For the patients with acute subtotal occlusion of LMCA and 3 vd, its diagnostic value is higher than that of any other single lead or multiple ones. The higher the amplitude of ST segment elevation in lead aVR is and the longer the duration is, the more serious the patients condition is. This paper reviews the diagnostic criteria of ST segment elevation in lead aVR, electrophysiological mechanism and overseas research progress.
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2016, Vol. 25 
