Value of lead aVR in the detection of significant left main coronary artery stenosis in acute coronary syndrome.

Background: Electrocardiographic lead aVR is usually ignored in patients with chest pain. ST segment elevation in aVR may have diagnostic value in patients with acute coronary syndrome (ACS) and significant stenosis or obstruction of the left main coronary artery (LMCAS), especially when accompanied by ST segment elevation in lead V(1).

Aim: To asses the value of lead aVR and V1 for the detection of LMCAS in patients with ACS.