Hypertension, PulmonaryPulmonary ArteryHypertensionHypertrophy, Right VentricularMonocrotalinePersistent Fetal Circulation SyndromePulmonary CirculationAnoxiaBlood PressureAntihypertensive AgentsHypertension, PortalVascular ResistanceHemodynamicsHypertension, RenalPulmonary EmbolismPulmonary Wedge PressureVentricular Function, RightLungIloprostVasodilator AgentsSulfonesVentricular Dysfunction, RightBone Morphogenetic Protein Receptors, Type IIHypertension, RenovascularEpoprostenolEndarterectomyPurinesCardiac CatheterizationHypertension, MalignantChronic DiseaseNitric OxideAdministration, InhalationPhosphodiesterase 5 InhibitorsEndothelin-1PoisonsDisease Models, AnimalRisk FactorsEchocardiography, DopplerCyclic Nucleotide Phosphodiesterases, Type 5Pulmonary Heart DiseaseArterial PressureMuscle, Smooth, VascularPulmonary Veno-Occlusive DiseasePhosphodiesterase InhibitorsRats, Sprague-DawleyEchocardiographyVasoconstrictionPiperazinesReceptors, Endothelin