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British Journal of Anaesthesia, Vol 81, Issue 6 968-969, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia

SHORT COMMUNICATIONS

Vascular properties of isoflurane: comparison between normal and cirrhotic rats

P. Kirstetter, F. Lagneau, F. Le Corre, S. Cailmail, R. Moreau, D. Lebrec and J. Marty
Department of Anaesthesia, Hopital Beaujon, Clichy, INSERM U-408, Hopital Bichat, Paris, France; INSERM U-24, Hopital Beaujon, Clichy, France

Isoflurane is known to dilate blood vessels and to modulate nitric oxide production. Because cirrhosis is characterized by over production of endothelial nitric oxide, isoflurane-induced vasodilatation may be altered in this situation. We have compared the vasodilator effects of isoflurane in normal rats and rats with secondary biliary cirrhosis. Aortic rings (intact or endothelium denuded) from normal and cirrhotic rats were suspended in HEPES solution and preconstricted with KCl 40 mmol litre-1. Isoflurane dose-dependently relaxed vessels in both groups. Maximal relaxation was comparable between normal and cirrhotic rats in intact (mean 80 (SEM 4) vs 81 (6)%; ns) and in denuded (100 (4) vs 95 (5)%; ns) vessels. Intact vessels relaxed more than denuded vessels in both groups (100 (4) vs 80 (4)% (P = 0.0008) in normal rats and 95 (5) vs 80 (6)% (P = 0.0008) in cirrhotic rats). We conclude that cirrhosis did not modify isoflurane-induced vasodilatation and that the modulator effect of endothelium was conserved.
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