Mechanisms of Abnormal Myocardial Relaxation induced by Ischemia : Comparison of Low Flow Ischemia and Hypoxia in Isolated Rabbit Heart : SYMPOSIUM ON MECHANICS OF CONTRACTION AND RELAXATION OF THE ISCHEMIC MYOCARDIUM : 50th Annual Scientific Session of J
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概要
- 論文の詳細を見る
To investigate the mechanisms of altered myocardial diastolic stiffness and relaxation induced by myocardial oxygen deficit, we compared the hemodynamic effects of low flow ischemia (myocardial infarction model) and hypoxia in which the coronary flow was not reduced (angina pectoris model) in isolated retrograde perfused rabbit hearts. A 15-min hypoxia induced a significant increase in the left ventricular end diastolic pressure (LVEDP 10±3 to 21±7 mmHg, p<0.05), Po(-1±6 to 12±5 mmHg, p<0.01) and T_B(41±8 to 54±10 ms, p<0.05), where Po and T_B are the asymptote and the time constant of the isovolumetric left ventricular pressure decline (P=Po+A・e^<-t/T_B>), respectively. There was a close linear correlation between the delta Po and delta LVEDP (t=0.98, p<0.01), and between delta T_B and delta LVEDP (r=0.73, p<0.05). Low flow ischemia increased Po (0±4 to 2±3 mmHg, p<0.05) and T_B (43±4 to 50±11 mmHg, NS). When DPI 201-106, a cardiotonic agent, was given to the hypoxia moded by increasing the Ca^<++> sensitivity of contractile proteins, further increases were observed in LVEDP (to 258 mmHg, p<0.05) and Po (to 157 mmHg, p<0.05). DPI also increased LVEDP (72 to 94 mmHg, NS) and Po(to 44 mmHg, p<0.05) in the ischemia model, However, T_B was not altered by DPI. Conclusions: 1) Po reflects the LVEDP, 2) The discrepancies between the changes of T and Po induced by DPI indicate different mechanisms underlying changes in LV diastolic stiffness and relaxation. 3) Both hypoxia and ischemia induced abnormalities in myocardial diastolic stiffness and relaxation.
- 社団法人日本循環器学会の論文
- 1987-01-20
著者
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Sato Hiroshi
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
-
SAKAMOTO Tsuguya
The Second Department of Internal Medicine
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Omae Teruo
琉球大学 第3内科
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Ornae Teruo
Second Dept. Of Intern. Med. Kyushu Univ. School Of Med.
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Takahashi Toshiyuki
Department Of Cardiovascular Medicine Graduate School Of Medicine University Of Tokyo
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Iizuka Masahiko
The second Department of Internal Medicine, Faculty of Medicine, University of Tokyo
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Oyama Tomomi
千葉大学 循環病態医科学
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Omae T
National Cardiovascular Center
-
Sugimoto T
The Second Department Of Internal Medicine
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Sugimoto Tsuneaki
The Second Department Of Internal Medicine Toyama Medical And Pharmaceutical University
-
Kohmoto Osami
The Second Department of Medicine, Saitama Medical School
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TAKAHASHI Toshiyuki
The Second Department of Internal Medicine, Faculty of Medicine, University of Tokyo
-
Serizawa Takashi
The Second Department of Internal Medicine, Saitama Medical School
-
Iizuka Masahiko
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
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Omae Teruo
2nd Div. Dept. Of Intern. Med. (prof. S. Katsuki) Facul. Of Med. Kyushu University Fukuoka
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Kohmoto Osami
The Second Department Of Medicine Saitama Medical School
-
Momomura Shin-ichi
The Second Department of Internal Medicine, University of Tokyo and Department of Anesthetology, Tei
-
Momomura Shin-Ichi
The Cardiovascular Division of Internal Medicine, University of Tokyo
-
Momomura Shin-ichi
The Cardiovascular Division Of Internal Medicine University Of Tokyo
-
Kohmoto Osami
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
-
Takahashi Tomiko
Department Of Cardiovascular Medicine University Of Tokyo
-
Mochizuki Takatoshi
The Second Department of Internal Medicine, University of Tokyo
-
Momomura Shin-ichi
University of Tokyo
-
OHYA Tetsuo
The Second Department of Internal Medicine Faculty of Medicine, University of Tokyo
-
Momomura Shin-ichi
The Second Department Of Internal Medicine University Of Tokyo And Department Of Anesthetology Teiky
-
Sugimoto Tsuneaki
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
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Takahashi Toshiyuki
Department Of Cardiovascular Medicine University Of Tokyo Graduate School Of Medicine
-
Serizawa Takashi
The Second Department Of Internal Medicine Saitama Medical School
-
Takahashi Tomiko
Department Of Laboratory Medicine University Of Tokyo
-
Ishii Masao
Second Department Of Internal Medicine Yokohama City University School Of Medicine
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SATO Hiroshi
Tsukuba Research Institute, Sumitomo Forestry Co. Ltd.
-
Toshimori Tsukasa
2nd Dept. Of Biochem. Miyazaki Med. Coll.
-
Mochizuki Takatoshi
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
-
Murao Satoru
University Of Tokyo
-
Ohya Tetsuo
2nd Dept. Of Internal Medicine Fac. Of Medicine Univ. Of Tokyo
-
Sato Hiroshi
The Second Department Of Internal Medicine
-
Ohya Tetsuo
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
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Satonaka Hiroshi
Department Of Nephrology And Endocrinology Graduate School Of Medicine University Of Tokyo
-
Momomura Shin-ichi
The Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
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