KryptonVentilation-Perfusion RatioXenon RadioisotopesPulmonary EmbolismVentilationRespiration, ArtificialPulmonary VentilationHigh-Frequency VentilationIntermittent Positive-Pressure VentilationTidal VolumePositive-Pressure RespirationHigh-Frequency Jet VentilationNoninvasive VentilationVentilator WeaningRespirationRespiratory MechanicsVentilators, MechanicalPulmonary Gas ExchangeCarbon DioxideIntubation, IntratrachealHypercapniaRespiratory Distress Syndrome, AdultOxygenVentilator-Induced Lung InjuryLumbosacral RegionWork of BreathingBlood Gas AnalysisPartial PressureLung ComplianceTracheostomyOne-Lung VentilationAir PressureHeliumIntensive Care UnitsIridoviridaeVentilators, Negative-PressureRespiratory Function TestsRespiratory Distress Syndrome, NewbornMasksMenopause, PrematureLung Volume MeasurementsIntensive CareTomography, X-Ray ComputedAnoxiaRespiratory Dead SpaceAirway ResistanceTracheotomyRespiratory RateProne PositionLung InjuryApneaDiaphragmHypoventilationTime FactorsHospitals, SatelliteOxygen Inhalation TherapyProspective StudiesPulmonary CirculationRespiratory Physiological PhenomenaPulmonary AtelectasisKrypton RadioisotopesAcute Lung InjuryRespiratory MusclesInfant, NewbornHyperventilationAirway ObstructionBarotraumaCritical IllnessLung DiseasesLung Diseases, ObstructiveInhalationAirway ExtubationFunctional Residual CapacityAnesthesia, GeneralTreatment OutcomeChemoreceptor CellsPulmonary EdemaOxygen ConsumptionAir ConditioningEquipment DesignInteractive Ventilatory SupportCritical CareRetrospective StudiesParrotsAir MovementsMiddle Ear VentilationPressureRespiratory TherapyPulmonary AlveoliCorneaInfant, PrematureIntensive Care Units, PediatricPneumonia, Ventilator-AssociatedPulmonary Disease, Chronic ObstructiveCapnographyHemodynamicsAPACHELength of StayContinuous Positive Airway PressureMonitoring, Physiologic