Prone PositionSupine PositionPelvisPatient PositioningKidney PelvisNephrostomy, PercutaneousPostureRespiratory Distress Syndrome, AdultPulmonary Gas ExchangeSudden Infant DeathDisposable EquipmentPositive-Pressure RespirationRespiration, ArtificialRespiratory MechanicsNitrogen RadioisotopesVentilation-Perfusion RatioLaryngopharyngeal RefluxPronationSpinePulmonary CirculationBedsUreteral CalculiOrgans at RiskEquipment ReuseLaryngeal MasksAirway ManagementTomography, X-Ray ComputedPelvic NeoplasmsPulmonary VentilationPressure UlcerBlood Gas AnalysisIntraoperative ComplicationsSleepGravitationIntubation, IntratrachealIntraoperative Care