Femoral VeinVeinsSaphenous VeinPopliteal VeinIliac VeinVaricose VeinsPortal VeinBlood VesselsVenous InsufficiencyVenous ValvesPhlebographyJugular VeinsVenous ThrombosisUltrasonography, Doppler, DuplexMesenteric VeinsPulmonary VeinsThighCatheterization, PeripheralFemoral ArteryLegThrombophlebitisSubclavian VeinHepatic VeinsVascular PatencyVena Cava, InferiorVascular MalformationsLymphatic VesselsCatheterization, Central VenousUmbilical VeinsRenal VeinsVascular Surgical ProceduresVenous PressureRetinal VesselsArteriovenous Shunt, SurgicalVascular GraftingBlood Flow VelocityBlood Vessel ProsthesisThrombosisVascular NeoplasmsVaricose UlcerCatheters, IndwellingVena Cava FiltersRegional Blood FlowDogsLower ExtremityCoronary VesselsTime FactorsPulmonary EmbolismCerebral VeinsSplenic VeinRetinal VeinUltrasonography, Doppler, ColorTreatment OutcomeCatheterizationCardiac CatheterizationConstriction, PathologicPhlebotomyDissectionBlood Vessel Prosthesis ImplantationLigationGraft Occlusion, VascularCentral Venous PressureBandagesPolytetrafluoroethyleneAnastomosis, SurgicalPostthrombotic SyndromeCadaverBrachiocephalic VeinsAzygos VeinPolyethylene TerephthalatesHemodynamicsGravity SuitsAxillary VeinRetinal Vein OcclusionTomography, X-Ray ComputedValsalva ManeuverEndothelium, VascularSaccharumFollow-Up Studies