Tsuguya Sakamoto
University of Tokyo
93 Papers
477 Citations
Tsuguya Sakamoto is an academic researcher from University of Tokyo. The author has contributed to research in topics: Mitral valve & Hypertrophic cardiomyopathy. The author has an hindex of 13, co-authored 93 publications. Previous affiliations of Tsuguya Sakamoto include Iwate Medical University.
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Papers
Acquired Pulmonary Artery Stenosis Report of a Case Caused by Mediastinal Tumor
TL;DR: An acquired stenosis of pulmonary artery caused by benign cystic teratoma in a 22-year-old female is described and the complexity of the cardiac murmur was discussed.
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Significance of left atrial pressure and left ventricular relaxation as determinants of left ventricular early diastolic filling flow in man.
Toshiyuki Takahashi,Masahiko Iizuka,Takashi Serizawa,Tetsuo Ohya,Hiroshi Sato,Osami Kohmoto,Takatoshi Mochizuki,Tsuguya Sakamoto,Tsuneaki Sugimoto +8 more
TL;DR: The results suggest that the level of left atrial pressure may mask the relationship between parameters ofLVEDF and LV relaxation, and that the relations among these variables vary with individual indices of LVEDF.
Relationship Between Mitral Regurgitation and Left Ventricular Outflow Obstruction in Hypertrophic Cardiomyopathy
I Hasegawa,Tsuguya Sakamoto,Yoshiyuki Hada,Katsu Takenaka,Keiko Amano,Takahashi H,Toshiyuki Takahashi,Jun-ichi Suzuki,T Shiota,Tsuneaki Sugimoto +9 more
TL;DR: Doppler and two-dimensional echocardiographic studies were performed in 62 patients with hypertrophic cardiomyopathy, and results may indicate that the midsystolic mitral regurgitation is hydrodynamically induced by the midSystolic pressure gradient across the protruding distal residual anterior mitral leaflet.
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Prevalence of concentric left ventricular hypertrophy in "non-cardiac" alcoholics. An echocardiographic study.
Tadashi Koide,Terumi Hayashi,Katsuhiko Ozeki,Hirofumi Ichiyasu,Tsuguya Sakamoto,Satoru Murao,Hiroaki Kono +6 more
Abstract: Left ventricular dimension and function were studied by echocardiography in 28 "non-cardiac" patients with chronic alcoholism. Concentric left ventricular hypertrophy was the prevalent abnormality. Gross hypertrophy with wall thickness exceeding 14mm was seen in 8 patients, and was associated with higher incidence of mild exertional dyspnea and paroxysmal tachyarrhythmia during drinking bouts than in 16 patients with almost normal left ventricle. Left ventricular ejection fraction was decreased in 2 and diastolic descent rate of the anterior mitral valve was decreased in 1 of the hypertrophied left ventricle. The concentric hypertrophy may represent a preclinical stage of alcoholic cardiomyopathy. In addition to the 24 patients with normal sized left ventricular cavity, there were 4 patients with dilated left ventricle and increased wall mass. Left ventricular ejection fraction and mitral valve motion were normal in all the 4, and cardiac output was suggested to be increased. The relations of this type of abnormality to the concentric hypertrophy and to clinical alcoholic cardiomyopathy were obscure.
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