In order to evaluate the ability of the echocardiogram to detect and localize left main or left anterior descending (LAD) coronary artery lesions, 11 normal subjects and 30 patients (pts) with LAD lesions were studied using conventional anterior echocardiography and newly developed esophageal echocardiography. The location of LAD lesions, proximal (20 pts : Prox-group) or distal (10 pts