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- W831416 abstract "The aim of this study was to characterize the time course and neuronal mechanism of remote ischemic preconditioning (RIPC) of the vasculature in humans.Non-lethal ischemia of internal organs induces local (ischemic preconditioning) and systemic (RIPC) resistance to lethal ischemia-reperfusion (IR) injury. Experimental RIPC has two temporal components, is neuronally mediated, is induced by limb ischemia, and reduces infarct size. In humans, RIPC prevents IR-induced vascular injury. Determining the time course and mechanism is a prelude to clinical outcome studies of RIPC.Endothelial IR injury was induced by arm ischemia (20 min) and reperfusion, and measured by flow-mediated dilation. To establish if there are early and late phases, RIPC (three 5-min cycles of ischemia of the contralateral arm) was applied immediately, 4, 24, and 48 h before IR. To determine neuronal involvement, trimetaphan (autonomic ganglion blocker; 1 to 6 mg/min intravenous) was infused during the application of the RIPC stimulus.Flow-mediated dilation was reduced by IR (8.7 +/- 1.1% before IR, 4.9 +/- 1.2% after IR; p < 0.001), but not when preceded by RIPC (8.0 +/- 0.8% after IR; p = NS); RIPC did not protect after 4 h (4.9 +/- 1.1% after IR; p < 0.001), but protected at 24 (8.7 +/- 1.1% after IR; p = NS) and 48 h (8.8 +/- 1.4% after IR; p = NS). Trimetaphan attenuated early (8.3 +/- 1.1% before IR, 4.2 +/- 0.9% after IR; p < 0.05) and delayed (7.3 +/- 1.0% before IR, 2.3 +/- 0.6% after IR, p < 0.001) RIPC.Remote ischemic preconditioning in humans has two phases of protection against endothelial IR injury; an early (short) and late (prolonged) phase, both of which are neuronally mediated. The potential for late phase RIPC to provide prolonged protection during clinical IR syndromes merits investigation." @default.
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- W831416 date "2005-08-01" @default.
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- W831416 title "Remote Ischemic Preconditioning Provides Early and Late Protection Against Endothelial Ischemia-Reperfusion Injury in Humans" @default.
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- W831416 doi "https://doi.org/10.1016/j.jacc.2005.04.044" @default.
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