A 70-year-old woman with a history of hypertension was admitted to the hospital complaining of chest pain. Electrocardiographic findings showed negative T in I, aVL, and V1-5; transthoracic two-dimensional echocardiography, left ventricular
hypertrophy without asynergy; transthoracic Doppler echocardiography, localized markedly higher velocity signal in proximal
portion of left anterior descending coronary artery (LAD) compared with the proximal or distal portion; and coronary
angiography, 90 percent stenosis at the mid portion of segment six in LAD. Stent implantation to the stenotic region was
undertaken, and the region was adequately dilated. Transthoracic Doppler echocardiography after stent implantation showed
disappearance of the segmental high velocity signal in the proximal LAD. Transthoracic Doppler echocardiography thus proved
to be a highly useful yet simple method for non-invasive diagnosis of the stenotic region in this case of proximal LAD.