Pulmonary CirculationRegional Blood FlowPulmonary ArteryBlood Flow VelocityPulmonary Gas ExchangeLungGravitationVentilation-Perfusion RatioSheepHeart Bypass, RightHypertension, PulmonaryVascular ResistanceHeart Defects, CongenitalMicrospheresHemodynamicsNoble GasesTechnetium Tc 99m Aggregated AlbuminFractalsProne PositionBlood Gas AnalysisOxygenatorsFontan ProcedureOxygenBlood PressureDogsAnoxiaKrypton RadioisotopesHypoplastic Left Heart SyndromeHeart Septal Defects, VentricularExtravascular Lung WaterPulmonary VeinsPulmonary AtresiaPartial PressureCardiac OutputSupine PositionCarbon DioxideCerebrovascular CirculationArteriovenous Shunt, SurgicalAortic Arch SyndromesGravity SuitsFetusNitric OxideRespirationVasoconstrictionPulmonary Diffusing CapacityRespiration, ArtificialVena Cava, SuperiorPulmonary Valve StenosisPulmonary EdemaLung Volume MeasurementsSheep, DomesticOxygen ConsumptionPulmonary VentilationCyanosisLiquid VentilationTurtlesDuctus ArteriosusNitric Oxide SynthasePulmonary Wedge PressureLaser-Doppler FlowmetryHead-Down TiltHeart RateDuctus Arteriosus, PatentCardiac CatheterizationAdministration, InhalationRestEndothelin-1Nitric Oxide Synthase Type IIIPostureLung InjuryModels, CardiovascularPulmonary AlveoliSwine, MiniatureThermodilutionSwinePositive-Pressure RespirationAnimals, NewbornVasodilationEchocardiography, DopplerCapillariesHydrogen SulfideFlow CytometryRespiratory MechanicsDisease Models, AnimalRespiratory Function TestsVasodilator AgentsTetralogy of FallotHLA-DR6 AntigenHeart Septal Defects, AtrialBlood VolumeInfant, NewbornTricuspid ValveFluorocarbonsPerfusionAnastomosis, SurgicalPregnancyCardiopulmonary BypassPostoperative PeriodTime FactorsCapillary Resistance