Effect of Angiotensin Converting Enzyme Inhibitor and Angiotensin II Type 1 Receptor Antagonist on Metabolism and Contraction in Ischemia-Reperfused Rabbit Heart
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概要
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The effect of angiotensin converting enzyme(ACE) inhibitor, temocaprilat and/or angiotensin II type 1(AT1) receptor antagonist, CV-11974 on myocardial metabolism and contraction during ischemia and reperfusion was examined by phosphorus 31-nuclear magnetic resonance (^<31>P-NMR) in Langendorff rabbit hearts. After normothermic 15 min global ischemia, postischemic reperfusion of 60 min was carried out. Temocaprilat and/or CV-11974 were administered from 40 min prior to the global ischemia. Adenosine triphosphate(ATP), creatine phosphate(PCr), inorganic phosphate(Pi), intracellular pH (pHi), left ventricular developed pressure(LVDevP), left ventricular end-diastolic pressure(LVEDP) and coronary flow were measured. Twenty-eight hearts were divided into 4 experimental groups consisting of 7 hearts each: group I consisted of controls, group II was perfused with temocaprilat (10^<-6> mol/L), group III was perfused with CV-11974 (10^<-6 mol/L), and group IV was perfused with temocaprilat (10^<-6> mol/L) in combination with CV-11974 (10^<-6> mol/L). Groups II and III showed a significant (p<0.05) inhibition of an overshoot phenomenon of PCr during postischemic reperfusion compared with group I. Group IV also showed a more pronounced significant (p<0.01) inhibition of the overshoot of PCr during reperfusion compared with group I. Groups II, III and IV showed a significant (p<0.05) inhibition of the decrease in ATP during global ischemia (59±2, 54±3 and 54±7%, respectively) compared with group I (45±3%). Groups III and IV showed a significant (p<0.05) early recovery of ATP during reperfusion (81±2, 80±6%) compared with group I (71±3%) and group II (73±2%). Group IV showed no more significant recovery in ATP than group III. There were no differences in LVDevP, LVEDP and coronary flow among these groups. In conclusion, temocaprilat in combination with CV-11974 has significant potential for improving myocardial energy metabolism during both myocardial ischemia and reperfusion.
- 社団法人日本循環器学会の論文
- 2000-03-20
著者
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ISHIKAWA Kinji
First Dept. of Inter. Med Tohoku Univ. School of Med.
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Kawabata Hitoshi
First Department of Internal Medicine, Kinki University School of Medicine
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Ishikawa Kinji
First Department Of Internal Medicine Kinki University School Of Medicine
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RYOMOTO Teruhiko
First Department of Internal Medicine, Kinki University School of Medicine
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Ryomoto Teruhiko
First Department Of Internal Medicine Kinki University School Of Medicine
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Kawabata Hitoshi
First Department Of Internal Medicine Kinki University School Of Medicine
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