Biochemical Changes of Ischemia |
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Authors: | Sidney Levitsky Harold Feinberg |
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Institution: | From the Departments of Surgery and Pharmacology, Abraham Lincoln School of Medicine and School of Basic Medical Science, University of Illinois College of Medicine, Chicago, Ill. |
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Abstract: | Normothermic ischemic arrest by aortic cross-clamping, a widely used clinical technique, is associated with metabolic changes in the myocardium that are incompletely understood. The effects of aortic cross-clamping on glycolytic pathways as well as associated morphological changes are discussed. Emphasis is placed on the conservation of high-energy phosphate moieties during the period of cross-clamping as well as during reperfusion. A marked reduction in total high-energy phosphates (62%) and glycogen (63%) and an increase in lactate production (243%) denote a shift to anaerobic metabolism during the period of arrest. Despite reperfusion, total high-energy nucleotides remained depressed. The data suggest that persistent abnormal myocardial carbohydrate metabolism and low levels of high-energy nucleotides prevent recovery of contractility following normothermic ischemic arrest and reperfusion. |
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Keywords: | Address reprint requests to Dr Levitsky Department of Surgery Abraham Lincoln School of Medicine of the University of Illinois College of Medicine P O Box 6998 Chicago Ill 60680 |
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