Venous PressureThrombosisPortal VeinVenous ThrombosisHypertensionHypertension, PortalFemoral VeinHypertension, PulmonaryAxillary VeinVaricose UlcerVenous InsufficiencyCerebral VeinsArteriovenous Shunt, SurgicalPortal SystemKlippel-Trenaunay-Weber SyndromeUpper Extremity Deep Vein ThrombosisArteriovenous FistulaSubclavian VeinVaricose VeinsCentral Nervous System Vascular MalformationsCranial SinusesVeinsPhlebographyCentral Venous PressureBrachiocephalic VeinsJugular VeinsConstriction, PathologicCoronary ThrombosisPortal PressureSinus Thrombosis, IntracranialHypertension, RenalLigationBlood PressureSaphenous VeinIntracranial ThrombosisPulmonary EdemaCarotid Artery ThrombosisHemodynamicsHypertension, RenovascularAntihypertensive AgentsRenal DialysisTreatment OutcomeVascular PatencyChronic DiseaseLegVascular Surgical ProceduresHypertension, MalignantMicrocirculationRisk FactorsLiver CirculationAnticoagulantsSplenic VeinMesenteric VeinsPortasystemic Shunt, SurgicalSagittal Sinus ThrombosisEsophageal and Gastric VaricesIntracranial Embolism and ThrombosisHypertension, Pregnancy-InducedTime FactorsIliac VeinLeukocytesFollow-Up StudiesThrombophiliaPulmonary ArteryVena Cava, InferiorRetrospective StudiesHepatic ArteryProspective StudiesOcular HypertensionLiver CirrhosisIntracranial HypertensionPregnancy Complications, CardiovascularHepatic VeinsPortographyDisease Models, AnimalRats, Inbred SHRReninBlood Pressure DeterminationThromboembolismHeparinKidneyRenal VeinsHemostasisFactor VFibrinolytic AgentsPortacaval Shunt, SurgicalGastrointestinal HemorrhagePrevalenceVascular ResistanceHeparin, Low-Molecular-WeightBlood CoagulationTomography, X-Ray ComputedCavernous Sinus ThrombosisRats, Inbred WKYPlatelet Aggregation InhibitorsLiverStentsBudd-Chiari SyndromeAntiphospholipid SyndromeIncidence