Venous PressurePortal VeinHypertensionHypertension, PortalBrazilPortugalHypertension, PulmonaryVaricose UlcerVenous InsufficiencyAxillary VeinFemoral VeinArteriovenous Shunt, SurgicalCerebral VeinsPortal SystemKlippel-Trenaunay-Weber SyndromeArteriovenous FistulaVaricose VeinsCentral Nervous System Vascular MalformationsSubclavian VeinUpper Extremity Deep Vein ThrombosisCentral Venous PressureVeinsCranial SinusesBrachiocephalic VeinsPortal PressureConstriction, PathologicJugular VeinsPhlebographyHypertension, RenalBlood PressureLigationRiversSaphenous VeinPulmonary EdemaAntihypertensive AgentsHypertension, RenovascularHemodynamicsRenal DialysisLegHypertension, MalignantPrevalenceChronic DiseaseVascular PatencyTradescantiaWater MovementsVascular Surgical ProceduresRisk FactorsMicrocirculationHemoglobins, AbnormalCross-Sectional StudiesTreatment OutcomeLiver CirculationHypertension, Pregnancy-InducedUrban PopulationEsophageal and Gastric VaricesEpidemiologic MethodsPopulation DensityPortasystemic Shunt, SurgicalEnvironmental MonitoringLeukocytesOcular HypertensionSplenic VeinPulmonary ArteryRetrospective StudiesInfant, NewbornSex DistributionRats, Inbred SHRReninSeasonsLiver CirrhosisBlood Pressure DeterminationSocioeconomic FactorsMesenteric VeinsIntracranial HypertensionPortographySeverity of Illness IndexHepatic VeinsKidneyRats, Inbred WKYVascular ResistanceHepatic ArteryDesoxycorticosteronePortacaval Shunt, SurgicalLiverHypertrophy, Right VentricularGastrointestinal HemorrhageSodium Chloride, DietaryBlood Pressure Monitoring, AmbulatoryMonocrotalinePregnancy Complications, CardiovascularAngiotensin IITime FactorsPolymerase Chain ReactionRenin-Angiotensin SystemRats, Sprague-DawleyQuestionnairesFollow-Up StudiesSplanchnic CirculationProspective StudiesDisease Models, Animal