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- W115656307 abstract "Survival of cardiac patients undergoing heart surgery depends critically upon the recovery of myocardial energy metabolism during reperfusion of ischemic myocardium. The present study compares various parameters of myocardial energy metabolism using an isolated in situ pig heart. The left anterior descending (LAD) coronary artery was occluded for 60 min, followed by 60 min of global hypothermic cardioplegic arrest and 60 min of reperfusion. Free radical scavengers [superoxide dismutase SOD and catalase] were used to protect the ischemic heart from reperfusion injury. In both control and SOD plus catalase-treated groups, ATP, creatine phosphate (CP), ATP/ADP ratio, energy charge and phosphorylation potential dropped significantly during ischemic insult. After reperfusion, CP, ATP/ADP ratio and phosphorylation potential improved significantly, but they were restored to control level only in treated animals. In either case, free energy of ATP hydrolysis (delta G) lowered only by 5% during ischemia, but recovered promptly upon reperfusion. SOD and catalase also improved coronary blood flow and reduced creatine kinase release compared to those of untreated animals, suggesting improved myocardial recovery upon reperfusion. Our results suggest that SOD and catalase significantly improve the myocardial recovery during reperfusion by enhancing rephosphorylation steps, and the value of delta G is more critical compared to those of ATP and CP for myocardial recovery." @default.
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- W115656307 date "1986-01-01" @default.
- W115656307 modified "2023-09-23" @default.
- W115656307 title "Effect of superoxide dismutase and catalase on myocardial energy metabolism during ischemia and reperfusion." @default.
- W115656307 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3709036" @default.
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