Pulmonary CirculationPulmonary ArteryHeartHypertension, PulmonaryHeart RateBlood CirculationLungVascular ResistanceAnoxiaDuctus ArteriosusPulmonary Heart DiseaseHemodynamicsVasoconstrictionHeart FailureHeart Defects, CongenitalPulmonary VeinsHypertrophy, Right VentricularAtrial PressureNitric OxideBlood PressurePerfusionDogsSheepCapillary ResistanceVentricular Function, RightCardiac OutputPersistent Fetal Circulation SyndromePulmonary Gas ExchangeAnatomy, RegionalModels, CardiovascularVasodilationHeart DiseasesPulmonary Wedge PressureVasodilator AgentsCardiac CatheterizationExtracorporeal CirculationHeart TransplantationBlood Flow VelocityPulmonary EdemaBronchial ArteriesRegional Blood FlowVentricular Dysfunction, RightPhysiologyFetus15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidOsteoarthropathy, Secondary HypertrophicTime FactorsOxygenRespirationAdministration, InhalationEndothelin-1Fetal HeartCardiography, ImpedanceVenous PressureChronic DiseasePulsatile FlowSynchrotronsAnimals, NewbornRats, Sprague-DawleyCapillariesMonocrotalineEndothelium, VascularVasoconstrictor AgentsPulmonary Valve StenosisPulmonary EmbolismNitric Oxide SynthasePulmonary AlveoliAdrenomedullinHeart ValvesDuctus Arteriosus, PatentProstaglandin Endoperoxides, SyntheticCollateral CirculationNitroarginineInfant, NewbornHeart AtriaEndothelinsNitric Oxide Synthase Type IIIBlood VesselsEpoprostenolRabbitsMicrocirculationMuscle, Smooth, VascularArteriovenous FistulaBlood VolumeAngiographyReceptors, EndothelinDisease Models, AnimalLung DiseasesHeart VentriclesEchocardiography, DopplerCyclic GMPEchocardiographyNitroprussideRats, WistarPressureBlood Gas AnalysisDose-Response Relationship, DrugHeart BlockOxygen ConsumptionMyocardium