کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2750400 | 1567311 | 2014 | 5 صفحه PDF | دانلود رایگان |
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 10 mg/kg/h propofol infusion and ventilated with 100% oxygen at an inspiratory rate of 80 breaths/min for 30 min. Three cycles of one-lung ventilation and two-lung ventilation were performed and one-lung ventilation was continued for 15 min. Arterial blood gas samples were obtained as follows: after cannulation and tracheotomy, following 30 min 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.
Journal: Brazilian Journal of Anesthesiology (English Edition) - Volume 64, Issue 2, March–April 2014, Pages 79–83