Pulmonary Gas ExchangeVentilation-Perfusion RatioLiquid VentilationAortic Arch SyndromesNoble GasesBlood Gas AnalysisPulmonary CirculationPulmonary EmbolismOxygenCarbon DioxidePulmonary VentilationPartial PressureKrypton RadioisotopesRespiration, ArtificialLungRespiratory MechanicsArrhythmia, SinusGasesRespirationTidal VolumeRespiratory Dead SpacePulmonary Diffusing CapacityVentilationOxygen ConsumptionTechnetium Tc 99m Aggregated AlbuminRespiratory Function TestsPerfusion ImagingAnoxiaPerfusionPulmonary EdemaXenon RadioisotopesHigh-Frequency VentilationRespiratory Distress Syndrome, AdultPositive-Pressure RespirationSmoke Inhalation InjuryHyperventilationPhysical ExertionIntermittent Positive-Pressure VentilationHemodynamicsCardiac OutputExercise TestHepatopulmonary SyndromeExtravascular Lung WaterPulmonary ArteryHigh-Frequency Jet VentilationExerciseAdministration, InhalationPulmonary AlveoliLung DiseasesNoninvasive VentilationVentilator WeaningVentilators, MechanicalVital CapacityBicyclingSpirometryHeart RateLung Volume MeasurementsDogsTime FactorsForced Expiratory VolumeHypercapniaIntubation, IntratrachealLung ComplianceRespiratory TransportLactic AcidWork of BreathingInhalationHeliumTomography, X-Ray ComputedAir PressureVentilator-Induced Lung InjurySensitivity and SpecificityMyocardial Perfusion ImagingRespiratory Physiological PhenomenaChromatography, GasNeonTracheostomyVentilators, Negative-PressureFluorocarbonsMasksRespiratory Distress Syndrome, NewbornGas Chromatography-Mass SpectrometryLung InjuryAirway ResistanceProne PositionOne-Lung VentilationIntensive Care UnitsLaryngeal MasksIntermittent Positive-Pressure BreathingMaximal Voluntary VentilationAcute Lung InjuryIntensive CareModels, BiologicalApneaWater Loss, InsensiblePlant TranspirationHypoventilationPressureRespiratory RateOxygen Inhalation Therapy