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• W2012079180 endingPage "1086" @default.
• W2012079180 startingPage "1077" @default.
• W2012079180 abstract "Reperfusion of the previously ischemic myocardium is associated with the production of oxygen free radicals and their metabolites, which contribute to the ultimate extent of irreversible myocardial injury. The relative importance of polymorphonuclear leukocytes vs intracellular-derived oxygen metabolites has remained uncertain. We evaluated the effectiveness of a free-radical scavenger, N-2-mercaptopropionyl glycine (MPG), in limiting infarct size after ischemia/reperfusion in dogs that were depleted of neutrophils with specific antisera. Twenty-four urethane-anesthetized open-chest dogs were subjected to 90 min of ischemia by occlusion of the left circumflex coronary artery followed by 6 hr of reperfusion. Dogs were randomly assigned to receive nonimmune serum, neutrophil antiserum, or neutrophil antiserum plus MPG (20 mg/kg intra-atrially 15 min before reperfusion was initiated and for 45 min after reperfusion). Infarct size, as a percent of the area at risk, was reduced by 33% in the neutrophil antiserum group as compared with the nonimmune group (30.7 +/- 2.7% vs 45.6 +/- 3.7%, p less than .01). The combined administration of neutrophil antiserum plus MPG reduced the size of infarction by 63% of the area at risk compared with that in the nonimmune group (17.0 +/- 2.7% vs 45.6 +/- 3.7%, p less than .01). The reduction in infarct size with neutrophil antiserum plus MPG was significantly greater than that with the neutrophil antiserum alone (p less than .01). The areas at risk did not differ among the groups. Myocardial protection could not be explained on the basis of hemodynamic differences. The observation that MPG enhances the protective effects of neutrophil depletion suggests that both extramyocardial- and intramyocardial-derived oxygen free radicals contribute significantly to reperfusion-induced myocardial injury." @default.
• W2012079180 created "2016-06-24" @default.
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• W2012079180 date "1986-05-01" @default.
• W2012079180 modified "2023-09-27" @default.
• W2012079180 title "Protective effects of N-2-mercaptopropionyl glycine against myocardial reperfusion injury after neutrophil depletion in the dog: evidence for the role of intracellular-derived free radicals." @default.
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• W2012079180 doi "https://doi.org/10.1161/01.cir.73.5.1077" @default.
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