豊田 康誠¹, 石井 秀太¹, 佐谷 修^{1, 2}, 中村 信男^{1, 2}, 上野 雄二², 塩谷 雅彦³, 西尾 一郎³

Yasuaki TOYODA¹, Shuta ISHII¹, Osamu SATANI^{1, 2}, Nobuo NAKAMURA^{1, 2}, Yuji UENO², Masahiko SHIOTANI³, Ichiro NISHIO³

¹国保那賀病院循環器科 , ²誠佑記念病院循環器科 , ³和歌山県立医科大学循環器内科

¹Division of Cardiology, Kokuho Naga Hospital, ²Division of Cardiology, Seiyu Memorial Hospital, ³Division of Cardiology, Department of Medicine, Wakayama Medical College

キーワード : Color Doppler echocardiography , Coronary artery stenosis , Coronary circulation , Pulsed Doppler echocardiography

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 V_1-5; 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.