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British Journal of Anaesthesia, Vol 82, Issue 6 938-940, Copyright © 1999 by The Board of Management and Trustees of the British Journal of Anaesthesia

SHORT COMMUNICATIONS

Effect of mild hypothermia on the vascular actions of phenylephrine in rat aortic rings

F. Lagneau, P. Kirstetter, C. Bernard and J. Marty
Department of Anaesthesia, Hopital Beaujon, Clichy, INSERM U-408, Hopital Bichat, Paris, France; Polyclinique de Savoie, Annemasse, Paris, France; Department of Anaesthesia, Hopital Lariboisiere, Paris, France

Intraoperative mild hypothermia is common. We have investigated the effects of mild hypothermia (34 vs 38 degrees C) on phenylephrine--(10(- 8) to 10(-5) mol litre-1) induced contractions of rat aortic rings mounted for isometric tension recordings. A marked decrease in Emax (maximal tension) (P < 0.05) and significant increase in EC50 (phenylephrine concentration producing 50% of maximal tension) were observed at the lower temperature in endothelium intact rings, but there was no effect of temperature when the endothelium had been removed. The decreased contraction with hypothermia in the endothelium intact vessels was restored to 84% by administration of the nitric oxide synthase inhibitor L-NNA and a small additional amount of tone was restored in the presence of the cyclooxygenase inhibitor, indomethacin. We conclude that mild hypothermia markedly decreased phenylephrine-induced rat aortic contraction in vitro by endothelium dependent mechanisms, largely related to increased nitric oxide production or action.
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