Hypertension, PulmonaryBlood PressurePulmonary ArteryPulmonary CirculationPressureArterial PressureHemodynamicsPulmonary Wedge PressureVascular ResistanceCardiac OutputAnoxiaHypertrophy, Right VentricularHeart RateMonocrotalineLungBlood Pressure DeterminationDogsVasodilator AgentsCentral Venous PressureVasoconstrictionPressoreceptorsAltitudePulmonary Gas ExchangeHydrostatic PressureCardiac CatheterizationHypertensionAntihypertensive AgentsCatheterization, Swan-GanzPulmonary EmbolismOxygenBlood Gas AnalysisAdministration, InhalationNitric OxideSulfonesPulmonary EdemaRats, Sprague-DawleySodium Nitrite15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidTime FactorsAltitude SicknessPulmonary Heart DiseaseVasoconstrictor AgentsSympathetic Nervous SystemPoisonsBaroreflexEndothelin-1Prostaglandins IVentricular Function, RightPurinesBlood Flow VelocityHypotensionTricuspid Valve InsufficiencyIntracranial PressureSheepSystoleRespirationEchocardiography, DopplerCarbon DioxideHematocritDisease Models, AnimalVasodilationPartial PressurePhosphodiesterase InhibitorsRegional Blood FlowDose-Response Relationship, DrugIloprostPersistent Fetal Circulation SyndromeEpoprostenolSwineAdrenomedullinNG-Nitroarginine Methyl EsterTransducers, PressurePerfusionEchocardiographyVenous PressureIntraocular PressureRespiratory MechanicsInjections, IntravenousBlood Pressure Monitoring, AmbulatoryKidneyNitric Oxide SynthaseRats, WistarPurinonesAtrial Natriuretic FactorReceptors, EndothelinHeartHeart VentriclesVentricular Dysfunction, RightLung Diseases, ObstructivePiperazinesInfusions, IntravenousRenal CirculationDenervationThromboxanesRats, Inbred SHRStroke VolumeAtmospheric PressureReflexConnective Tissue DiseasesRenin