Yasushi Sunaga
Kansai Medical University
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Publication
Featured researches published by Yasushi Sunaga.
Journal of the American College of Cardiology | 1991
Kayo Hayashi; Kenji Dote; Yasushi Sunaga; Tetsuro Sugiura; Toshiji Iwasaka; Mitsuo Inada
To estimate the preload reserve in response to an increase in afterload in patients with old myocardial infarction, the relation between the Doppler echocardiographic inflow velocity pattern and left ventricular end-diastolic pressure was investigated during isometric handgrip exercise testing. The study population consisted of 16 normal subjects and 40 patients with old myocardial infarction. The 40 patients were subdivided into two groups according to left ventricular end-diastolic pressure at rest: group I (22 patients), less than 18 mm Hg; group II (18 patients), 18 mm Hg or more. At rest, the ratio of peak velocity in atrial contraction phase to peak velocity in early diastolic filling phase (A/E) was significantly higher in the patients with old myocardial infarction than in normal subjects; values in the two subgroups of myocardial infarction did not differ significantly. The A/E ratio and left ventricular end-diastolic pressure increased significantly during exercise in group I. Conversely, the change in left ventricular end-diastolic pressure during exercise in group II was significantly greater than that in group I, and was associated with a decrease in the A/E ratio. Thus, an atrial compensatory mechanism operated effectively in response to the increase in afterload in patients with a normal left ventricular filling pressure, whereas this compensatory mechanism deteriorated in patients with elevated left ventricular filling pressure due to a limited preload reserve.
American Heart Journal | 1992
Yasushi Sunaga; Yoshio Taniichi; Naohiko Okubo; Kayo Hayashi; Masahiro Karakawa; Tetsuro Sugiura; Toshiji Iwasaka; Mitsuo Inada
American Heart Journal | 1992
Yasushi Sunaga; Naohiko Okubo; Kayo Hayashi; Yoshio Taniichi; Tetsuro Sugiura; Toshiji Iwasaka; Mitsuo Inada
American Heart Journal | 1992
Yasushi Sunaga; Kayo Hayashi; Naohiko Okubo; Yoshio Taniichi; Tetsuro Sugiura; Nobuyuki Tsuda; Toshiji Iwasaka; Mitsuo Inada
Nihon Naibunpi Gakkai zasshi | 1989
Yasushi Sunaga; Mitsushige Nishikawa; Kiyoshi Inaba; Noburo Hirozane; Noboru Inoue; Nobuaki Shikata; Mitsuo Inada
American journal of noninvasive cardiology | 1994
Yasushi Sunaga; Kayo Hayashi; Tetsuro Sugiura; Nobuyuki Tsuda; Torn Seki; Shigeto Hasegawa; Atsuro Takeuchi
American journal of noninvasive cardiology | 1992
Hitoshi Koito; Hisato Nakamori; Jun-ichi Suzuki; Naohiko Okubo; Yasushi Sunaga; Toshiji Iwasaka; Mitsuo Inada; Yutaka Suga
Japanese Circulation Journal-english Edition | 1990
Naohiko Okubo; Yasushi Sunaga; Yoshio Taniichi; Kayo Hayashi; Masahiro Karakawa; Toshiji Iwasaka; Mitsuo Inada; Takayuki Uba; Nobuyuki Tsuda
Japanese Circulation Journal-english Edition | 1989
Kayo Hayashi; Kenji Dote; Takayuki Uba; Yasushi Sunaga; Nobuyuki Tsuda; Masahiro Karakawa; Tohru Kurimoto; Mitsuo Inada
Japanese Circulation Journal-english Edition | 1989
Yoshio Taniichi; Yasushi Sunaga; Takayuki Uba; Kayo Hayashi; Naohiko Okubo; Kenji Dote; Nobuyuki Tsuda; Norimichi Taniguchi; Mitsuo Inada