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Prediction of Left Main Coronary Artery Obstruction by 12‐Lead Electrocardiography: ST Segment Deviation in Lead V6 Greater than or Equal to ST Segment Deviation in Lead V1

Background: Acute coronary syndrome (ACS) resulting from culprit lesion in left main coronary artery (LMCA) can cause rapid hemodynamic deterioration. It is important to identify these patients early to facilitate timely revascularization. ST segment elevation in aVR greater than or equal to V1 (aVR‐V1≥ 0) has been suggested as a sensitive predictor of LMCA disease. As a result of balanced forces, we hypothesized that ST deviation in V6 greater than or equal to ST deviation in V1 (V6‐V1≥ 0) might be a good determinant of LMCA disease.