Dehghani P, Zahedi A, Hassanzadeh M, et al. - Among patients with anterior myocardial infarction, the ST-segment elevation in V4R leads was investigated as well as its influence on prognosis and the detection and prediction of the location of arterial stenosis in coronary angiography. Researchers studied hospital recorded files of 195 patients’ suspicion of acute myocardial infarction who have been referred within 2 h of the initiation of cardiac symptoms. Patients were divided into two groups with and without ST elevation in the V4R chest lead. Findings highlighted a high probability of ST-segment elevation in V4R lead concurrently with ST-elevation in V ₁ lead. Along with ST-segment elevation appearance in V4R lead, the following findings can be observed: a lower left ventricular ejection fraction, myocardial infarct size, involvement of proximal part of left anterior descending artery (LAD), and Wrap around LAD.