Prone PositionSupine PositionPatient PositioningExtracorporeal Membrane OxygenationRespiratory Distress Syndrome, AdultNephrostomy, PercutaneousOxygenPosturePulmonary Gas ExchangeSudden Infant DeathRespiration, ArtificialDisposable EquipmentPositive-Pressure RespirationRespiratory MechanicsVentilation-Perfusion RatioPulmonary CirculationNitrogen RadioisotopesBlood Gas AnalysisLaryngopharyngeal RefluxPronationBedsPulmonary VentilationLaryngeal MasksSpectroscopy, Near-InfraredSpineEquipment ReuseUreteral CalculiOxygen Inhalation TherapyOrgans at RiskAirway ManagementIntraoperative ComplicationsIntubation, IntratrachealOxygen ConsumptionPressure UlcerSleepIntraoperative CarePartial PressureLung Volume MeasurementsRespirationGravitationOxyhemoglobinsProspective StudiesHyperbaric Oxygenation