Respiration, ArtificialHigh-Frequency VentilationLiquid VentilationDiaphragmVentilators, Negative-PressureRespiratory InsufficiencyPositive-Pressure RespirationRespiratory Distress Syndrome, AdultPulmonary Gas ExchangeTidal VolumeRespiratory Distress Syndrome, NewbornOxygenVentilationVentilator WeaningInfant, NewbornIntermittent Positive-Pressure VentilationPulmonary VentilationFluorocarbonsRespiratory MechanicsVentilator-Induced Lung InjuryVentilators, MechanicalLung ComplianceWork of BreathingRespirationCarbon DioxideLung InjuryStress, MechanicalIntensive Care UnitsTracheostomyBlood Gas AnalysisPartial PressureIntermittent Positive-Pressure BreathingIntubation, IntratrachealLungHypercapniaNoninvasive VentilationIntensive CareCritical IllnessTime FactorsPressureTracheotomyPneumonia, Ventilator-AssociatedHigh-Frequency Jet VentilationAirway ExtubationCritical CareAPACHEIntensive Care Units, PediatricProspective StudiesAir PressureAcute Lung InjuryLength of StayTreatment OutcomeBarotraumaPulmonary AtelectasisHemodynamicsLung Volume MeasurementsVentilation-Perfusion RatioRetrospective StudiesRespiratory Function TestsRespiratory TherapyLung DiseasesProne PositionAirway ResistanceMechanical ProcessesPneumoniaHospital MortalityRespiratory Dead SpaceEquipment DesignInteractive Ventilatory SupportMasksRespiratory MusclesApneaSwineHelium