Prone PositionSupine PositionPatient PositioningFaceNephrostomy, PercutaneousRespiratory Distress Syndrome, AdultPosturePulmonary Gas ExchangeSudden Infant DeathDisposable EquipmentPositive-Pressure RespirationRespiration, ArtificialRespiratory MechanicsNitrogen RadioisotopesVentilation-Perfusion RatioLaryngopharyngeal RefluxPronationPulmonary CirculationBedsSpineEquipment ReuseLaryngeal MasksUreteral CalculiOrgans at RiskAirway ManagementPulmonary VentilationBlood Gas AnalysisPressure UlcerIntraoperative ComplicationsSleepGravitationIntubation, IntratrachealIntraoperative Care