CapillariesMicrocirculationCapillary FragilityPerfusionPulmonary Gas ExchangePulmonary Wedge PressureVentilation-Perfusion RatioIsothiuroniumPulmonary CirculationPulmonary AlveoliPulmonary VentilationRespiratory Dead SpaceRespiration, ArtificialCarbon DioxideCheekMesocricetusRespirationCapillary PermeabilityTidal VolumeMicroscopy, VideoOxygenRespiratory MechanicsBlood Gas AnalysisRegional Blood FlowHemodilutionLungHemangioma, CapillaryPartial PressureBlood Flow VelocityVentilationNitrogen RadioisotopesPulmonary EdemaRespiratory Function TestsMacrophages, AlveolarHemodynamicsElectrophoresis, CapillaryPulmonary Diffusing CapacityCapillary ResistanceAnoxiaCricetinaePerfusion ImagingOxygen ConsumptionBlood-Air BarrierRespiratory InsufficiencyHigh-Frequency VentilationPositive-Pressure RespirationCardiac OutputRespiratory Distress Syndrome, AdultIntermittent Positive-Pressure VentilationExtravascular Lung WaterVascular ResistanceMyocardial Perfusion ImagingModels, BiologicalBlood VolumeHigh-Frequency Jet VentilationNoninvasive VentilationHeart FailureBlood PressureLung ComplianceDogsVentilator WeaningLung Volume MeasurementsCapillary ActionHypertension, PulmonaryAlveolar ProcessTime FactorsCatheterization, Swan-GanzVentilators, MechanicalPulmonary ArteryPulmonary Alveolar ProteinosisLung DiseasesStroke VolumePressureCardiac CatheterizationIntubation, IntratrachealHypercapniaTotal Lung CapacityVentricular Function, LeftHeart RateCentral Venous PressureExercise TestShock, SurgicalCarbon MonoxideVentilator-Induced Lung InjuryAlveolar Bone LossProspective StudiesTomography, Emission-Computed, Single-PhotonPhysical ExertionRhabdomyosarcoma, AlveolarAcute DiseaseVentricular PressurePulmonary SurfactantsReproducibility of ResultsWork of BreathingHeliumTransfer FactorIndicator Dilution TechniquesTreatment OutcomeCoronary CirculationEchocardiography, Doppler