Respiration, ArtificialWork of BreathingPositive-Pressure RespirationInteractive Ventilatory SupportVentilators, MechanicalVentilator WeaningTidal VolumePulmonary VentilationRespiratory MechanicsVentilationRespiratory InsufficiencyPulmonary Gas ExchangeRespirationAir PressureRespiratory RateIntubation, IntratrachealDiaphragmCarbon DioxideHigh-Frequency VentilationRespiratory MusclesIntermittent Positive-Pressure VentilationBlood Gas AnalysisLung Volume MeasurementsHigh-Frequency Jet VentilationNoninvasive VentilationOxygenPressureLung Diseases, ObstructiveVentilation-Perfusion RatioProspective StudiesHypercapniaRespiratory Distress Syndrome, AdultVentilator-Induced Lung InjuryPartial PressureLungLung ComplianceTracheostomyOne-Lung VentilationHeliumIntensive Care UnitsLaryngeal MasksVentilators, Negative-PressureRespiratory Distress Syndrome, NewbornMasksMaximal Voluntary VentilationRespiratory Function TestsIntensive CareRespiratory Dead SpaceAnoxiaTracheotomyAirway ResistanceApneaLung InjuryHypoventilationProne PositionIntermittent Positive-Pressure BreathingOxygen Inhalation TherapyRespiratory Physiological PhenomenaKrypton RadioisotopesAcute Lung InjuryPulmonary CirculationHyperventilationKryptonPulmonary AtelectasisBarotraumaAirway ObstructionCritical IllnessAirway ExtubationFunctional Residual CapacityChemoreceptor CellsInfant, NewbornInhalationAnesthesia, GeneralTime FactorsAir ConditioningOxygen ConsumptionPulmonary EdemaLung DiseasesCritical CareNeuromuscular DiseasesAir MovementsMiddle Ear VentilationRespiratory TherapyPulmonary AlveoliEquipment DesignIntensive Care Units, PediatricFluorocarbonsTreatment OutcomePneumonia, Ventilator-AssociatedInfant, PrematureCapnographyAPACHEPulmonary Disease, Chronic ObstructiveHemodynamicsContinuous Positive Airway PressureLength of StayPulmonary SurfactantsXenon RadioisotopesRespiratory ParalysisMonitoring, Physiologic