Prone PositionSupine PositionPatient PositioningNephrostomy, PercutaneousRespiratory Distress Syndrome, AdultPosturePulmonary Gas ExchangeSudden Infant DeathDisposable EquipmentPositive-Pressure RespirationRespiration, ArtificialRespiratory MechanicsNitrogen RadioisotopesVentilation-Perfusion RatioLaryngopharyngeal RefluxPronationPulmonary CirculationBedsSpineEquipment ReuseUreteral CalculiLaryngeal MasksOrgans at RiskAirway ManagementPulmonary VentilationIntraoperative ComplicationsPressure UlcerBlood Gas AnalysisSleepGravitationIntubation, IntratrachealIntraoperative Care