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CARDIOVASCULAR ANESTHESIA

Xenon Administration During Early Reperfusion Reduces Infarct Size After Regional Ischemia in the Rabbit Heart In Vivo

Benedikt Preckel, MD, DEAA^*, Jost Müllenheim, MD^*, Andrej Moloschavij, MD, Volker Thämer, MD, and Wolfgang Schlack, MD, DEAA^*

Institut für *Klinische Anaesthesiologie and Institut für Herz- und Kreislauf-Physiologie, Heinrich-Heine-Universität Düsseldorf, Germany

Address correspondence and reprint request to Benedikt Preckel, MD, DEAA, Institut für Klinische Anaesthesiologie, Heinrich-Heine-Universität, Postfach 10 10 07, D-40001 Düsseldorf, Germany. Address e-mail to benedikt{at}herzkreis.uni-duesseldorf.de

The noble gas xenon can be used as an anesthetic gas with many of the properties of the ideal anesthetic. Other volatile anesthetics protect myocardial tissue against reperfusion injury. We investigated the effects of xenon on reperfusion injury after regional myocardial ischemia in the rabbit. Chloralose-anesthetized rabbits were instrumented for measurement of aortic pressure, left ventricular pressure, and cardiac output. Twenty-eight rabbits were subjected to 30 min of occlusion of a major coronary artery followed by 120 min of reperfusion. During the first 15 min of reperfusion, 14 rabbits inhaled 70% xenon/30% oxygen (Xenon), and 14 rabbits inhaled air containing 30% oxygen (Control). Infarct size was determined at the end of the reperfusion period by using triphenyltetrazolium chloride staining. Xenon reduced infarct size from 51% ± 3% of the area at risk in controls to 39% ± 5% (P < 0.05). Infarct size in relation to the area at risk size was smaller in the xenon-treated animals, indicated by a reduced slope of the regression line relating infarct size to the area at risk size (Control: 0.70 ± 0.08, r = 0.93; Xenon: 0.19 ± 0.09, r = 0.49, P < 0.001). In conclusion, inhaled xenon during early reperfusion reduced infarct size after regional ischemia in the rabbit heart in vivo.

Implications: Xenon might be a suitable volatile anesthetic in an ischemia-reperfusion situation.

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