title: [Usefulness of dobutamine stress echocardiography in a patient with aortic valve stenosis and left ventricular dysfunction: a case report].
abstract: A 76-year-old man with previous antero-septal myocardial infarction and aorto-coronary bypass surgery developed exertional dyspnea. Echocardiography revealed diffuse left ventricular hypokinesis and aortic stenosis with a mean pressure gradient of 29 mmHg. Coronary angiography showed no significant lesions in the bypass grafts and total occlusions of the proximal left anterior descending artery and mid circumflex artery. Dobutamine stress echocardiography was performed to evaluate the severity of aortic stenosis and left ventricular functional reversibility. Administration of dobutamine increased the mean pressure gradients to 48 mmHg and increased the stroke volume by 28% without change in aortic valve area of about 0.5 cm2. We considered that our patient had severe aortic stenosis with contractile reserve. After aortic valve replacement, he improved with better left ventricular function.
authors.affiliation: Department of Cardiology, Kobe National Hospital, Nishiochiai 3-1-1, Suma-ku, Kobe 654-0155.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Shimizu
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Tatsumi
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Miwa
authors.forename: Takashi
authors.initials: T
authors.lastname: Shima
authors.forename: Toshio
authors.initials: T
authors.lastname: Okada
authors.forename: Hiroya
authors.initials: H
authors.lastname: Minami
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Mukohara
mesh_terms: D000368:Aged; D001021:Aortic Valve / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000000981:diagnostic imaging* / Q000601:surgery; D002316:Cardiotonic Agents; D004280:Dobutamine; D025401:Echocardiography, Stress; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D008297:Male; D018487:Ventricular Dysfunction, Left / Q000150:complications*
chemical_list: D002316:Cardiotonic Agents; D004280:Dobutamine