Pulmonary Gas ExchangeVentilation-Perfusion RatioNoble GasesBlood Gas AnalysisPulmonary CirculationPulmonary EmbolismOxygenCarbon DioxideKrypton RadioisotopesPartial PressureLungArrhythmia, SinusRespiratory MechanicsPulmonary VentilationPulmonary Diffusing CapacityRespiratory Dead SpaceRespirationTechnetium Tc 99m Aggregated AlbuminOxygen ConsumptionRespiration, ArtificialPerfusion ImagingRespiratory Function TestsTidal VolumePerfusionAnoxiaGasesPulmonary EdemaXenon RadioisotopesSmoke Inhalation InjuryPhysical ExertionHyperventilationRespiratory Distress Syndrome, AdultVentilationHemodynamicsExercise TestHepatopulmonary SyndromeCardiac OutputExtravascular Lung WaterPulmonary ArteryExercisePositive-Pressure RespirationAdministration, InhalationPulmonary AlveoliLung DiseasesBicyclingHigh-Frequency VentilationVital CapacitySpirometryHeart RateDogsIntermittent Positive-Pressure VentilationForced Expiratory VolumeLactic AcidRespiratory TransportLung Volume MeasurementsTime FactorsTomography, X-Ray ComputedHigh-Frequency Jet VentilationMyocardial Perfusion ImagingInhalationVentilator WeaningVentilators, MechanicalSensitivity and SpecificityNoninvasive VentilationNeonLung ComplianceWork of BreathingHypercapniaHeliumIntubation, IntratrachealWater Loss, InsensiblePlant TranspirationAir PressureFluorocarbonsRespiratory Physiological PhenomenaModels, BiologicalVentilator-Induced Lung InjuryLiquid VentilationLung Injury