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• W2034343042 abstract "Background— Reperfusion during acute myocardial infarction remains the best treatment for reducing infarct size. Postconditioning, applied at the onset of reperfusion, reduces myocardial infarction both in animals and humans. The objective of this study was to identify the time delay to apply postconditioning at reperfusion, allowing preservation of cardioprotection in the mouse myocardium. This is a major issue in the management of acute myocardial infarction patients. Methods and Results— Mice were subjected to 40 minutes of ischemia and 60 minutes of reperfusion (IR 60′ ). Postconditioning protocols corresponding to repetitive ischemia (3 cycles of 1 minute of ischemia and 1 minute of reperfusion) were applied during early reperfusion at various time durations (Δt) after reopening of the coronary artery (Δt=10 seconds, 1, 5, 10, 15, 20, 30, and 45 minutes; PostC Δt ). Infarct size/area at risk was reduced by 71% in PostC Δ1 compared with IR 60′ mice ( P =5×10 −6 ). There was a linear correlation ( r 2 =0.91) between infarct size and Δt, indicating that the cardioprotective effect of delayed postconditioning was progressively attenuated when Δt time increased. The protective effect of PostC Δ1 and PostC Δ15 was still effective when the duration of reperfusion was prolonged to 24 hours (IR 24 hours ; PostC Δ1 and PostC Δ15 versus IR 24 hours , P =0.001). Similar results were obtained for internucleosomal DNA fragmentation and lactate dehydrogenase release. Conclusions— This study in our in vivo mouse model of myocardial IR shows for the first time that delaying the intervention of postconditioning to 30 minutes does not abrogate the cardioprotective effect of postconditioning. This finding provides evidence that the time window of protection afforded by postconditioning may be larger than initially reported." @default.
• W2034343042 created "2016-06-24" @default.
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• W2034343042 date "2011-09-20" @default.
• W2034343042 modified "2023-10-10" @default.
• W2034343042 title "Delayed Postconditioning in the Mouse Heart In Vivo" @default.
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• W2034343042 doi "https://doi.org/10.1161/circulationaha.111.031864" @default.
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