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 VentilationPressure UlcerBlood Gas AnalysisIntraoperative ComplicationsSleepGravitationIntubation, IntratrachealIntraoperative Care