Pulmonary CirculationPulmonary ArteryHypertension, PulmonaryBlood CirculationLungAnoxiaVascular ResistanceDuctus ArteriosusPulmonary Heart DiseaseHemodynamicsVasoconstrictionPulmonary VeinsHypertrophy, Right VentricularAtrial PressureBlood PressureNitric OxideCapillary ResistanceSheepCardiac OutputVentricular Function, RightPersistent Fetal Circulation SyndromeAnatomy, RegionalPulmonary Gas ExchangeDogsVasodilationPerfusionPulmonary Wedge PressureVasodilator AgentsExtracorporeal CirculationModels, CardiovascularBlood Flow VelocityBronchial ArteriesPulmonary EdemaCardiac Catheterization15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidPhysiologyOsteoarthropathy, Secondary HypertrophicFetusRegional Blood FlowVentricular Dysfunction, RightAdministration, InhalationVenous PressureOxygenEndothelin-1SynchrotronsCardiography, ImpedanceRespirationTime FactorsPulsatile FlowCapillariesMonocrotalinePulmonary Valve StenosisAnimals, NewbornEndothelium, VascularPulmonary AlveoliVasoconstrictor AgentsPulmonary EmbolismDuctus Arteriosus, PatentHeart Defects, CongenitalProstaglandin Endoperoxides, SyntheticChronic DiseaseNitric Oxide SynthaseAdrenomedullinCollateral CirculationRats, Sprague-DawleyNitroarginineMuscle, Smooth, VascularAngiographyBlood VesselsLung DiseasesEndothelinsMicrocirculationArteriovenous FistulaNitric Oxide Synthase Type IIIHeart VentriclesEpoprostenolSwineInfant, NewbornPregnancyBlood Gas AnalysisBlood VolumeDisease Models, AnimalReceptors, EndothelinRabbitsHeartCyclic GMPEnterohepatic CirculationCerebrovascular CirculationNitroprussidePressureCoronary CirculationHeart RateAortaHematocritDose-Response Relationship, DrugAtrial Natriuretic FactorEchocardiography, DopplerProstaglandinsContrast MediaEndothelial Cells