Portal VeinStomachHypertension, PortalHypertensionBlood PressurePressureVeinsHypertension, PulmonaryPortal SystemPortal PressureSaphenous VeinHypertension, RenalAntihypertensive AgentsVaricose VeinsStomach NeoplasmsBlood Pressure DeterminationHydrostatic PressureHypertension, RenovascularFemoral VeinMesenteric VeinsPulmonary VeinsJugular VeinsHepatic VeinsVenous PressureHypertension, MalignantSplenic VeinBlood Pressure Monitoring, AmbulatoryStomach DiseasesRenal VeinsLiver CirculationHemodynamicsTime FactorsHeart RateIntraocular PressureIntracranial PressureIliac VeinVascular ResistanceUmbilical VeinsPulmonary ArteryArterial PressureTransducers, PressureEsophageal and Gastric VaricesHypertension, Pregnancy-InducedReninRats, Inbred SHROcular HypertensionKidneyPortasystemic Shunt, SurgicalGastric MucosaTreatment OutcomeRisk FactorsPopliteal VeinStomach UlcerProspective StudiesAtmospheric PressureIntracranial HypertensionSystoleRats, Sprague-DawleyFollow-Up StudiesAir PressureDogsRats, Inbred WKYRegional Blood FlowPulmonary Wedge PressureLiver CirrhosisVentricular PressureDisease Models, AnimalSodium Chloride, DietaryAngiotensin IILiverSubclavian VeinCerebral VeinsPortographyRetrospective StudiesHepatic ArteryPrevalenceVenous ThrombosisDesoxycorticosteroneNorepinephrineRenin-Angiotensin SystemAzygos VeinDiastoleVasodilator AgentsRetinal VeinSympathetic Nervous SystemCentral Venous PressureRats, WistarSplanchnic CirculationLigationGastrointestinal HemorrhagePregnancy Complications, CardiovascularArteriesBlood Flow VelocityNitric OxideHypertrophy, Right VentricularPortacaval Shunt, SurgicalAldosteroneVasoconstrictionCardiovascular DiseasesEndothelium, Vascular