Noninvasive VentilationRespiration, ArtificialRespiratory InsufficiencyVentilator WeaningPositive-Pressure RespirationPulmonary Disease, Chronic ObstructiveVentilationPulmonary VentilationHigh-Frequency VentilationIntermittent Positive-Pressure VentilationTidal VolumeHigh-Frequency Jet VentilationRespirationRespiratory MechanicsVentilators, MechanicalPulmonary Gas ExchangeCarbon DioxideVentilation-Perfusion RatioIntubation, IntratrachealHypercapniaRespiratory Distress Syndrome, AdultVentilator-Induced Lung InjuryOxygenWork of BreathingBlood Gas AnalysisPartial PressureLungLung ComplianceTracheostomyOne-Lung VentilationAir PressureHeliumIntensive Care UnitsLaryngeal MasksVentilators, Negative-PressureRespiratory Distress Syndrome, NewbornMasksMaximal Voluntary VentilationRespiratory Function TestsLung Volume MeasurementsIntensive CareRespiratory Dead SpaceAnoxiaTracheotomyAirway ResistanceRespiratory RateApneaLung InjuryHypoventilationDiaphragmProne PositionIntermittent Positive-Pressure BreathingOxygen Inhalation TherapyRespiratory Physiological PhenomenaTime FactorsKrypton RadioisotopesAcute Lung InjuryPulmonary CirculationRespiratory MusclesHyperventilationKryptonPulmonary AtelectasisBarotraumaInfant, NewbornAirway ObstructionCritical IllnessProspective StudiesAirway ExtubationFunctional Residual CapacityLung Diseases, ObstructiveChemoreceptor CellsInhalationAnesthesia, GeneralOxygen ConsumptionAir ConditioningPulmonary EdemaLung DiseasesTreatment OutcomeInteractive Ventilatory SupportCritical CareNeuromuscular DiseasesAir MovementsMiddle Ear VentilationEquipment DesignRespiratory TherapyPressurePulmonary AlveoliIntensive Care Units, PediatricFluorocarbonsPneumonia, Ventilator-AssociatedInfant, PrematureCapnographyRetrospective StudiesAPACHELength of StayHemodynamicsContinuous Positive Airway PressureMonitoring, PhysiologicPulmonary SurfactantsXenon Radioisotopes