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Inhibition of Na+–H+ exchange before resuscitation following hemorrhagic shock is cardioprotective in rats

By Mona Soliman

Abstract

AbstractBackgroundStimulation of the Na+–H+ exchanger during resuscitation following hemorrhagic shock results in myocardial injury and dysfunction. Inhibition of the Na+–H+ exchanger appears to be a new pharmacological tool for myocardial protection following ischemia–reperfusion. Our lab showed that inhibition of the Na+–H+ exchanger, using amiloride and dimethyl amiloride, before ex vivo resuscitation of isolated perfused hearts protected the myocardium and improved the post-resuscitation myocardial function. The purpose of the present study was to examine the myocardial protective effects of treating the hemorrhagic shocked rats by intra-arterial injection of 20μM dimethyl amiloride (DMA), a specific Na+–H+ exchanger blocker, before in vivo resuscitation.MethodsSprague–Dawley rats were assigned to hemorrhagic treated or untreated groups (n=4 per group). After 60min of hemorrhagic shock, rats were treated or not by injection of 20μM 5-(N,N-dimethyl)-amiloride (DMA) intra-arterially. Rats were then resuscitated in vivo and monitored for 30min. Then hearts were harvested and perfused in the Langendorff system for 60min for measurements of hemodynamic function.ResultsAdministration of DMA before in vivo resuscitation following 60min of hemorrhagic shock and 30min of in vivo resuscitation, 20μM DMA intra-arterially significantly improved post-resuscitation myocardial function.ConclusionOur results suggest that DMA protects the heart against post-resuscitation myocardial injury

Publisher: King Saud University. Production and hosting by Elsevier B.V.
Year: 2009
DOI identifier: 10.1016/j.jsha.2009.06.003
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