Pulmonary CirculationPulmonary ArteryVeinsHypertension, PulmonaryPulmonary VeinsBlood CirculationLungAnoxiaVascular ResistanceSaphenous VeinDuctus ArteriosusPortal VeinPulmonary Heart DiseaseVaricose VeinsHemodynamicsVasoconstrictionFemoral VeinHypertrophy, Right VentricularAtrial PressureJugular VeinsBlood PressureNitric OxideCapillary ResistanceSheepCardiac OutputPersistent Fetal Circulation SyndromeAnatomy, RegionalVentricular Function, RightDogsVasodilationPulmonary Gas ExchangePerfusionMesenteric VeinsVasodilator AgentsPulmonary Wedge PressureBlood Flow VelocityExtracorporeal CirculationModels, CardiovascularRenal VeinsUmbilical VeinsIliac VeinBronchial ArteriesVenous PressureCardiac CatheterizationRegional Blood FlowPulmonary Edema15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidHepatic VeinsPhysiologyOsteoarthropathy, Secondary HypertrophicFetusVentricular Dysfunction, RightEndothelium, VascularPopliteal VeinAdministration, InhalationEndothelin-1OxygenPulsatile FlowPulmonary EmbolismSynchrotronsCardiography, ImpedanceVasoconstrictor AgentsRespirationCapillariesPulmonary Valve StenosisMonocrotalineTime FactorsSubclavian VeinPulmonary AlveoliMuscle, Smooth, VascularAnimals, NewbornArteriovenous FistulaSplenic VeinProstaglandin Endoperoxides, SyntheticCerebral VeinsCollateral CirculationHeart Defects, CongenitalNitric Oxide SynthaseDuctus Arteriosus, PatentAdrenomedullinAngiographyNitroarginineChronic DiseaseBlood VesselsEndothelinsNitric Oxide Synthase Type IIIEpoprostenolMicrocirculationRats, Sprague-DawleyRetinal VeinHeart VentriclesInfant, NewbornSwineBlood VolumeBlood Gas AnalysisPregnancyLung DiseasesReceptors, EndothelinCyclic GMPHeart