부산대학교 도서관

Background : Prone positioning of patients during anesthesia affect respiratory mechanics and vital sign. We investigated the effects of the prone position on the mechanical properties (compliance, resistance, peak inspiratory pressure, plateau pressure and arterial gas tension) and vital sign (blood pressure and heart rate) in anesthetized and paralyzed patients.Methods : Twenty five patients of ASA Ⅰ-II grade were selected that scheduled for lumbar spine surgery. After intubation, the patients were ventilated mechanically with tidal volume 10ml/kg and respiration rate 10/min. Anesthesia was maintained by sevoflurane(1.5%) and nitrous oxide(2L). Peak inspiratory pressure, plateau pressure, resistance, compliance, arterial oxygen tension, carbon dioxide tension, heart rate and arterial blood pressure was estimated at 10min after induction of anesthesia. At 10min after placement in the prone, these parameters were also measured.Results : We found that the prone position did not significantly affect the arterial oxygen tension, carbon dioxide tension, blood pressure and heart rate, but peak inspiratory pressure and resistance significantly increased and compliance decreased in the prone position.Conclusions : The prone position during general anesthesia significantly changed compliance, resistance and peak inspiratory pressure, but did not significantly change arterial gas tension, blood pressure, heart rate.