Respiration, ArtificialPostoperative CareVentilationPulmonary VentilationHigh-Frequency VentilationIntermittent Positive-Pressure VentilationTidal VolumePositive-Pressure RespirationHigh-Frequency Jet VentilationNoninvasive VentilationVentilator WeaningRespirationRespiratory 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 PhenomenaKrypton RadioisotopesAcute Lung InjuryPulmonary CirculationRespiratory MusclesHyperventilationKryptonPulmonary AtelectasisBarotraumaAirway ObstructionCritical IllnessAirway ExtubationFunctional Residual CapacityLung Diseases, ObstructiveChemoreceptor CellsInfant, NewbornInhalationAnesthesia, GeneralTime FactorsAir ConditioningOxygen ConsumptionPulmonary EdemaLung DiseasesInteractive Ventilatory SupportCritical CareNeuromuscular DiseasesProspective StudiesAir MovementsMiddle Ear VentilationRespiratory Therapy