Venous PressurePortal VeinVeinsHypertensionFemoral VeinHypertension, PortalAxillary VeinHypertension, PulmonaryVenous InsufficiencyVaricose UlcerVaricose VeinsCerebral VeinsArteriovenous Shunt, SurgicalPortal SystemSaphenous VeinKlippel-Trenaunay-Weber SyndromeSubclavian VeinArteriovenous FistulaJugular VeinsCentral Nervous System Vascular MalformationsUpper Extremity Deep Vein ThrombosisBrachiocephalic VeinsCentral Venous PressureCranial SinusesPhlebographyConstriction, PathologicPortal PressureHypertension, RenalLigationBlood PressurePulmonary EdemaHemodynamicsMesenteric VeinsLegAntihypertensive AgentsHypertension, RenovascularPulmonary VeinsVascular PatencyHepatic VeinsRenal DialysisSplenic VeinVascular Surgical ProceduresChronic DiseaseHypertension, MalignantRenal VeinsTreatment OutcomeMicrocirculationLiver CirculationIliac VeinUmbilical VeinsEsophageal and Gastric VaricesHypertension, Pregnancy-InducedPortasystemic Shunt, SurgicalPopliteal VeinRisk FactorsLeukocytesPulmonary ArteryOcular HypertensionLiver CirrhosisPortographyRats, Inbred SHRReninVenous ThrombosisHepatic ArteryBlood Pressure DeterminationTime FactorsAzygos VeinIntracranial HypertensionKidneyLiverVascular ResistanceRats, Inbred WKYRetinal VeinPortacaval Shunt, SurgicalFollow-Up StudiesDesoxycorticosteroneProspective StudiesPregnancy Complications, CardiovascularPrevalenceHypertrophy, Right VentricularAngiotensin IIGastrointestinal HemorrhageSodium Chloride, DietarySplanchnic CirculationBlood Pressure Monitoring, AmbulatoryMonocrotalineRetrospective StudiesRats, Sprague-DawleyRetinal Vein OcclusionDisease Models, AnimalRenin-Angiotensin SystemEndothelium, VascularVena Cava, InferiorVasodilator AgentsMuscle, Smooth, VascularAldosteroneHeart RateRegional Blood FlowNorepinephrineNitric Oxide