• Ayşe Karci, Seden Duru, Hasan Hepağuşlar, Lügen Ciftçi, and Osman Yilmaz.
• Department of Anesthesiology and Reanimation, Medical School, Dokuz Eylul University, İzmir, Turkey. Electronic address: ayse.karci@deu.edu.tr.
• Braz J Anesthesiol. 2014 Mar 1;64(2):79-83.

BackgroundIt is known that hypoxic pulmonary vasoconstriction increases as a result of intermittent regional hypoxic challenges. The aim of this study was to compare the effects of sevoflurane and propofol on oxygenation and shunt fraction during one-lung ventilation in a novel model of hypoxic preconditioning before one-lung ventilation.MethodsSixteen Wistar-albino rats were anesthetized intra-peritoneally before venous and arterial cannulations and tracheotomized. The animals were randomly allocated to receive either sevoflurane 2% or 10mg/kg/h propofol infusion and ventilated with 100% oxygen at an inspiratory rate of 80 breaths/min for 30min. Three cycles of one-lung ventilation and two-lung ventilation were performed and one-lung ventilation was continued for 15min. Arterial blood gas samples were obtained as follows: after cannulation and tracheotomy, following 30min of treatment with sevoflurane or propofol, and at the 5th and 15th min of one-lung ventilation.ResultsThe PaO2 levels were higher and shunt fractions were lower in rats receiving propofol compared to rats treated with sevoflurane but the difference was not significant; the two groups were comparable in terms of PaCO2.ConclusionsThe similar effects of sevoflurane and propofol on PaO2 during one-lung ventilation following hypoxic preconditioning may be due to other causes beside the inhibition of hypoxic pulmonary vasoconstriction. Gradual transition to one-lung ventilation is a novel technique for preconditioning experiments for one-lung ventilation.Copyright © 2013 Sociedade Brasileira de Anestesiologia. Published by Elsevier Editora Ltda. All rights reserved.

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