• Thorsten M Smul, Jan Stumpner, Christoph Blomeyer, Christopher Lotz, Andreas Redel, Markus Lange, Norbert Roewer, and Franz Kehl.
• Department of Anesthesiology, Universitätsklinikum Würzburg, Würzburg, Germany.
• J. Cardiothorac. Vasc. Anesth.. 2011 Apr 1;25(2):276-81.

ObjectivesThe authors tested the hypothesis that ischemic and desflurane-induced preconditioning are blocked by propofol.DesignA prospective, randomized, vehicle-controlled study.SettingA university research laboratory.SubjectsNew Zealand white rabbits (n = 52).MethodsPentobarbital-anesthetized rabbits were subjected to 30 minutes of coronary artery occlusion followed by 3 hours of reperfusion. Rabbits received 0.0 (control) or 1.0 minimum alveolar concentration of desflurane (30 minutes' duration and a 30-minute memory period) or ischemic preconditioning (5 minutes of ischemia and a 30-minute memory period) in the absence or presence of propofol (10 mg/kg/h intravenously) or its vehicle (10% Intralipid emulsion; B Braun, Melsungen, Germany). The myocardial infarct size was measured with triphenyltetrazolium staining. Statistical analysis was performed with 1-way and 2-way analysis of variance when appropriate, followed by a post hoc Duncan test. Data are mean ± standard deviation.ResultsMyocardial infarct size was 56% ± 8% in control animals (n = 7). Desflurane significantly (p < 0.05) reduced the infarct size to 37% ± 6% (n = 7). Desflurane-induced preconditioning was blocked by propofol (65% ± 10%, n = 7) but not by its vehicle (45% ± 11%, n = 5). Propofol and its vehicle alone had no effect on the infarct size (62% ± 8% [n = 6] and 58% ± 3% [n=5], respectively). Ischemic preconditioning reduced infarct size in the absence or presence of propofol to 24% ± 7% (n = 7) and 29% ± 12% (n = 6).ConclusionDesflurane-induced preconditioning markedly reduced infarct size and was blocked by propofol, whereas ischemic preconditioning was not blocked by propofol. The results suggest an important interference between propofol and anesthetic-induced preconditioning and might explain some contradictory findings in studies in humans.Copyright © 2011 Elsevier Inc. All rights reserved.

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