The Effects of Dopamine, Dobutamine and Amrinone on Mitochondrial Function in Cardiogenic Shock.
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概要
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The impairment of mitochondria in non-infarcted myocardium under cardiogenic shock complicated by acute myocardial infarction was studied.We induced acute myocardial infarction in dogs by ligating the circumflex branch of the left coronary artery (LCX). On basis of left ventricular systolic pressure (LVPs) after 60 minutes, we divided the dogs into two groups: a group in which LVPs fell to below 70% of the pre-LCX ligation level, and a Control group in which LVPs remained more than 90%. The former group was further divided into four subgroups, depending on infusion of dopamine, dobutamine, amrinone or saline after 90 minutes. Mitochondria were prepared and mitochondrial respiratory activity determined.In the Saline group, hemodynamics became reduced to less than 70% of the preligation level after 120 minutes, however, in the Dopamine and Dobutamine groups, hemodynamics became restored to the preligation level. In the Amrinone group, LVPs decreased slightly, while cardiac output, LV Max. dp/dt and myocardial blood flow increased. In the Saline group, mitochondria in the non-infarcted myocardium functioned at a lower level of activity than that of the Control group. However, in the Dopamine, Dobutamine, and Amrinone groups, the mitochondria functioned at a higher level. Electron microscopy revealed mitochondrial damage in the Saline group only.The results indicate that an energy production disorder in the noninfarcted myocardium may have pathogenetic implications in cardiogenic shock associated with acute myocardial infarction, while dopamine, dobutamine, and amrinone improve mitochondrial function, and ultimately improve cardiac function.
- International Heart Journal刊行会の論文
著者
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KONNO Noburu
Third Department of Internal Medicine, Showa University School of Medicine
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Umetsu Kazuhiko
Third Department Of Internal Medicine Showa Univirsity School Of Medi Cine
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Itoh Seiji
Third Department Of Internal Medicine Showa University
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Tomita Masataka
Third Department Of Internal Medicine Showa University School Of Medicine
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Yanagishita Toshikuni
Third Department Of Internal Medicine Showa University School Of Medicine.
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Mukae Shuji
Third Department Of Internal Medicine Showa University
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Katagiri Takashi
Third Department Inter Nat Medicine Showa University
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Geshi Eiichi
Third Department Of Internal Medicine Showa University School Of Medicine
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ITOH Seiji
Third Department of Internal Medicine, Showa University School of Medicine
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