Work of BreathingVentilator WeaningRespirationRespiratory MechanicsRespiration, ArtificialTidal VolumeContinuous Positive Airway PressureInhalationRespiratory InsufficiencyPositive-Pressure RespirationDiaphragmPulmonary VentilationIntubation, IntratrachealVentilators, MechanicalMouth BreathingRespiratory MusclesMasksCarbon DioxideAirway ResistanceBlood Gas AnalysisPulmonary Gas ExchangeVentilator-Induced Lung InjuryTracheostomyRespiratory Function TestsApneaSleep Apnea, ObstructiveSleep Apnea SyndromesLung ComplianceVentilation-Perfusion RatioIntermittent Positive-Pressure VentilationRespiratory RateIntercostal MusclesExhalationRespiratory Physiological PhenomenaPolysomnographyOxygenBreathing ExercisesLaryngeal MasksAirway ExtubationAir PressureAnesthesia, GeneralLung Volume MeasurementsHypercapniaRespiratory TherapyRespiratory Distress Syndrome, AdultRespiratory Dead SpaceMaximal Voluntary VentilationLungLung Diseases, ObstructiveSupine PositionThoraxIntensive CarePulmonary AtelectasisHigh-Frequency Jet VentilationHeart RatePhrenic NerveLung InjuryHigh-Frequency VentilationIntensive Care UnitsAnesthesiaPressureCardiac OutputEquipment DesignOleic AcidVagotomyCritical IllnessAcute Lung InjuryElectromyographyOxygen ConsumptionVagus NervePulmonary Disease, Chronic ObstructiveProspective StudiesTime FactorsPropofolBlood PressureHemodynamicsPostureMonitoring, PhysiologicIntermittent Positive-Pressure BreathingSleep Apnea, CentralAnesthetics, IntravenousTreatment OutcomeSnoringAnesthetics, InhalationSwineDogsCheyne-Stokes RespirationAnoxiaSleepReference ValuesHeliumReproducibility of ResultsSleep StagesRespiratory CenterPatient ComplianceOxygen Inhalation TherapyHyperventilationModels, BiologicalAirway ObstructionWakefulness