Venous ThrombosisPortal VeinThrombosisHypertension, PortalHypertensionVeinsThrombophlebitisHeartFemoral VeinPortal SystemHypertension, PulmonaryIliac VeinUpper Extremity Deep Vein ThrombosisPhlebographyMesenteric VeinsSplenic VeinRenal VeinsAnticoagulantsPulmonary EmbolismHeart RateVaricose VeinsJugular VeinsSaphenous VeinPopliteal VeinSubclavian VeinSinus Thrombosis, IntracranialIntracranial ThrombosisCoronary ThrombosisPortal PressureVena Cava, InferiorHypertension, RenalRisk FactorsFibrin Fibrinogen Degradation ProductsHeparin, Low-Molecular-WeightBlood PressureTreatment OutcomeAxillary VeinThrombophiliaHepatic VeinsBudd-Chiari SyndromeTime FactorsPortasystemic Shunt, SurgicalCerebral VeinsPostthrombotic SyndromeAntihypertensive AgentsCarotid Artery ThrombosisPulmonary VeinsHypertension, RenovascularUltrasonography, Doppler, DuplexProspective StudiesFollow-Up StudiesEsophageal and Gastric VaricesHeart FailureVenous ThromboembolismRetrospective StudiesHeparinLiver CirculationLegProtein S DeficiencyFactor VThromboembolismThrombectomyHypertension, MalignantHeart DiseasesWarfarinVena Cava FiltersFibrinolytic AgentsTomography, X-Ray ComputedMesenteric Vascular OcclusionPregnancy Complications, CardiovascularPlethysmography, ImpedanceLiver CirrhosisPostphlebitic SyndromeStockings, CompressionPostoperative ComplicationsHemorrhageHeart Defects, CongenitalIntermittent Pneumatic Compression DevicesSplenorenal Shunt, SurgicalUltrasonography, DopplerIncidenceSplenectomyHemodynamicsUmbilical VeinsHeart TransplantationPortacaval Shunt, SurgicalRisk AssessmentRecurrenceLiver TransplantationHepatic ArteryThrombolytic TherapyActivated Protein C ResistanceGastrointestinal HemorrhageUltrasonography, Doppler, ColorDisease Models, AnimalBandagesVenous InsufficiencyProthrombinAngiographySagittal Sinus Thrombosis