Portal VeinVenous ThrombosisVeinsThrombosisPhlebitisHypertension, PortalFemoral VeinCatheterization, PeripheralHypertensionParenteral NutritionThrombophlebitisPortal SystemHypertension, PulmonaryCatheterization, Central VenousIliac VeinUpper Extremity Deep Vein ThrombosisPhlebographyMesenteric VeinsCatheters, IndwellingSplenic VeinRenal VeinsParenteral Nutrition, TotalAnticoagulantsPulmonary EmbolismVaricose VeinsTime FactorsJugular VeinsSaphenous VeinDogsPopliteal VeinSubclavian VeinInfusions, IntravenousCatheterizationInjections, IntravenousSinus Thrombosis, IntracranialIntracranial ThrombosisCoronary ThrombosisPortal PressureLiverVena Cava, InferiorHypertension, RenalFibrin Fibrinogen Degradation ProductsBlood PressureHeparin, Low-Molecular-WeightRisk FactorsTreatment OutcomeAxillary VeinThrombophiliaHepatic VeinsBudd-Chiari SyndromeCerebral VeinsPostthrombotic SyndromePortasystemic Shunt, SurgicalCarotid Artery ThrombosisUltrasonography, Doppler, DuplexAntihypertensive AgentsHypertension, RenovascularPulmonary VeinsEsophageal and Gastric VaricesVenous ThromboembolismHeparinLegRetrospective StudiesProspective StudiesFollow-Up StudiesLiver CirculationProtein S DeficiencyFactor VThromboembolismThrombectomyHypertension, MalignantVena Cava FiltersFibrinolytic AgentsPeripheral NervesWarfarinTomography, X-Ray ComputedMesenteric Vascular OcclusionPregnancy Complications, CardiovascularPlethysmography, ImpedanceLiver CirrhosisPostphlebitic SyndromeStockings, CompressionIntermittent Pneumatic Compression DevicesHemorrhagePostoperative ComplicationsSplenorenal Shunt, SurgicalUltrasonography, DopplerSplenectomyUmbilical VeinsRecurrencePortacaval Shunt, SurgicalHepatic ArteryLiver TransplantationActivated Protein C ResistanceUltrasonography, Doppler, ColorThrombolytic TherapyIncidenceGastrointestinal HemorrhageBandagesLower Extremity