Masaaki Tamitani
Yamaguchi University
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Featured researches published by Masaaki Tamitani.
American Journal of Cardiology | 1991
Masunori Matsuzaki; Masaaki Tamitani; Yoichi Toma; Hiroshi Ogawa; Kazuhiro Katayama; Yasuo Matsuda; Reizo Kusukawa
To analyze left atrial (LA) pump function in normal subjects, in patients with essential hypertension and in patients with a healed myocardial infarction, LA dimension (aortic-root echogram) and pressure (catheter-tip manometer) were simultaneously recorded in 25 patients (8 normal subjects, 7 with hypertension and 10 with myocardial infarction). The pressure-dimension relation of the left atrium was composed of 2 loops: the A loop (expressing the pump function of the left atrium) and the V loop. LA dimension at the beginning of active LA shortening was significantly greater in hypertensive subjects (33 +/- 3 mm) and in those with myocardial infarction (32 +/- 4 mm) than in normal subjects (28 +/- 3 mm) (p less than 0.01, p less than 0.05, respectively). The area of the A loop significantly increased in subjects with hypertension (48 +/- 3 mm Hg.mm, p less than 0.01) and in subjects with myocardial infarction (29 +/- 10 mm Hg.mm, p less than 0.05), compared with normal subjects (20 +/- 8 mm Hg.mm). The mean fractional shortening velocity of the left atrium significantly increased in subjects with hypertension, compared with normal subjects and those with myocardial infarction (p less than 0.05 for both). LA peak wall tension during the LA active contraction period significantly increased with hypertension and with myocardial infarction, compared with normal subjects (p less than 0.01, p less than 0.05, respectively). The area of the A loop was directly proportional to the LA dimension at the beginning of active LA shortening (r = 0.53), p less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
American Journal of Cardiology | 1983
Yoichi Toma; Yasuo Matsuda; Masunori Matsuzaki; Yoshito Anno; Takako Uchida; Naoshige Hiroyama; Masaaki Tamitani; Toshiaki Murata; Fumio Yonezawa; Kohshiro Moritani; Kazuhiro Katayama; Hiroshi Ogawa; Reizo Kusukawa
The sizes of both left atrial (LA) and right atrial (RA) cavities were assessed in 16 patients by esophageal echocardiography and biplane cineangiography. The changes in echocardiographic dimension and cineangiographic volume during 1 cardiac cycle showed excellent correlations in both atria. In the left atrium, the relation between the echocardiographic dimension and the cineangiographic volume was significant (r = 0.83) and was fitted by the following power function: LA volume (ml) = 0.94 X LA dimension (mm) 1.24. In the right atrium, the relation between the dimension and the volume was significant; RA volume (ml) = 0.015 X RA dimension (mm) 2.34 (r = 0.95). Thus, esophageal echocardiography is a useful method for evaluating LA and RA size and simultaneously observing of both atria.
American Heart Journal | 1985
Masunori Matsuzaki; Yoichi Tohma; Yoshito Anno; Naoshige Hiroyama; Fumio Yonezawa; Masaaki Tamitani; Toshiaki Maeda; Kazuhiro Katayama; Yasuo Matsuda; Toshiaki Kumada; Reizo Kusukawa
Japanese Circulation Journal-english Edition | 1991
Banyo Fujii; Masunori Matsuzaki; Kiyoshi Takashiba; Hironori Ebihara; Yoshio Hamada; Hiroshi Ohno; Eiji Hyakuna; Shigeki Tani; Masaaki Tamitani
American Heart Journal | 1986
Naoko Kohtoku; Yasuo Matsuda; Hiroshi Ogawa; Shinya Kohtoku; Masunori Matsuzaki; Masaaki Tamitani; Reizo Kusukawa
Japanese Circulation Journal-english Edition | 1985
Masunori Matsuzaki; Fumio Yonezawa; Toshiro Miura; Yoichi Tohma; Masaaki Tamitani; Toshiaki Maeda; Mitsuharu Konishi; Michihiro Kohno; Shiro Ono; F. Yano; Masaharu Ozaki; Toshiaki Kumada; Reizo Kusukawa
Japanese Circulation Journal-english Edition | 1984
Fumio Yonezawa; Masunori Matsuzaki; Yoichi Tohma; Yasuo Matsuda; Yoshito Anno; Naoshige Hiroyama; Masaaki Tamitani; Toshiaki Maeda; R. Maeda; Kazuyoshi Okada; Mitsuharu Konishi; Toshiaki Kumada; Reizo Kusukawa
Japanese Circulation Journal-english Edition | 1983
Naoshige Hiroyama; Masunori Matsuzaki; Yoichi Toma; Toru Sasaki; Masaaki Tamitani; Toshiaki Murata; Fumio Yonezawa; Mitsuharu Konishi; Yojiro Takahashi; Takako Uchida; Yoshito Anno; Toshiaki Kumada; Reizo Kusukawa
Japanese Circulation Journal-english Edition | 1983
Yoichi Toma; Yasuo Matsuda; Toru Sasaki; Yoshito Anno; Masunori Matsuzaki; Takako Uchida; Naoshige Hiroyama; Masaaki Tamitani; Tomoaki Murata; R. Maeda; Kazuyoshi Okada; Toshiro Miura; Fumio Yonezawa; Kazuhiro Katayama; K. Moritani; Fumio Yoshino; Hisao Ogawa; Toshiaki Kumada; Reizo Kusukawa
Japanese Circulation Journal-english Edition | 1982
Masaaki Tamitani; Masunori Matsuzaki; Yoichi Toma; Toru Sasaki; Yoshito Anno; Yojiro Takahashi; Takako Uchida; Naoshige Hiroyama; Toshiaki Murata; Fumio Yonezawa; Michihiro Kohno; Takashi Fujii; Kazuhiro Katayama; Fumio Yoshino; Hiroshi Ogawa; Yasuo Matsuda; Toshiaki Kumada; Reizo Kusukawa