Hypertension, PulmonaryPulmonary Gas ExchangePulmonary ArteryHypertensionGasesHypertrophy, Right VentricularPulmonary CirculationMonocrotalinePersistent Fetal Circulation SyndromeAnoxiaLungBlood PressureVentilation-Perfusion RatioHemodynamicsAntihypertensive AgentsCarbon DioxideVascular ResistanceOxygenPulmonary EmbolismHypertension, PortalNoble GasesPulmonary Wedge PressureBlood Gas AnalysisRespiratory TransportHypertension, RenalVentricular Function, RightVasodilator AgentsIloprostSulfonesEpoprostenolVentricular Dysfunction, RightBone Morphogenetic Protein Receptors, Type IIAdministration, InhalationHypertension, RenovascularPartial PressureEndarterectomyNitric OxideChronic DiseasePurinesCardiac OutputCardiac CatheterizationHypertension, MalignantOxygen ConsumptionRespirationRespiratory MechanicsRespiratory Function TestsDisease Models, AnimalRespiration, ArtificialEndothelin-1Phosphodiesterase 5 InhibitorsWater Loss, InsensiblePlant TranspirationPoisonsTime FactorsExercise TestPulmonary EdemaPulmonary VentilationPulmonary AlveoliRespiratory Distress Syndrome, AdultRats, Sprague-DawleySheepPulmonary Diffusing CapacityRespiratory Dead SpaceRisk FactorsVasoconstrictionRespiratory InsufficiencyEchocardiography, DopplerTreatment OutcomeCyclic Nucleotide Phosphodiesterases, Type 5Arterial PressurePulmonary Heart DiseaseExercise ToleranceLiquid VentilationMuscle, Smooth, VascularPhosphodiesterase InhibitorsPulmonary Veno-Occlusive DiseasePiperazinesEchocardiographyReceptors, EndothelinLung ComplianceHypertension, Pregnancy-InducedPhotosynthesisPlant StomataScleroderma, SystemicTidal VolumePlant LeavesLung DiseasesProspective StudiesHeart RateSeverity of Illness IndexRetrospective StudiesProstaglandins ITricuspid Valve InsufficiencyLung TransplantationNitric Oxide Synthase Type IIIPregnancy Complications, CardiovascularChromatography, GasAltitudeLung Volume MeasurementsThromboembolism