VeinsVaricose VeinsSaphenous VeinPulmonary VeinsFemoral VeinPortal VeinMesenteric VeinsJugular VeinsHepatic VeinsBlood VesselsVenous InsufficiencyVena Cava, InferiorVena Cava, SuperiorLegUltrasonography, Doppler, DuplexLymphatic VesselsUmbilical VeinsRenal VeinsIliac VeinRetinal VesselsMuscle, Smooth, VascularPopliteal VeinCoronary VesselsCerebral VeinsSplenic VeinRetinal VeinSubclavian VeinBrachiocephalic VeinsAzygos VeinAxillary VeinRetinal Vein OcclusionEndothelium, VascularArteriesVenous ThrombosisNeovascularization, PhysiologicEndothelial CellsNeovascularization, PathologicPhlebographyGraft Occlusion, VascularTime FactorsVascular PatencyBlood Vessel ProsthesisHuman Umbilical Vein Endothelial CellsTreatment OutcomeRegional Blood FlowLymphatic SystemFemoral ArteryBlood Flow VelocityMicrocirculationCapillariesVasoconstrictionVascular Surgical ProceduresConstriction, PathologicVascular Endothelial Growth Factor AVasodilationImmunohistochemistryArteriolesUltrasonography, Doppler, ColorRetinal ArteryThrombophlebitisIschemiaCells, CulturedTomography, X-Ray ComputedThrombosisAortaMagnetic Resonance AngiographyLymphangiogenesisVascular GraftingRabbitsAnastomosis, SurgicalVenae CavaeLigationCollateral CirculationDogsDisease Models, AnimalAntigens, CD31Carotid ArteriesTunica IntimaFollow-Up StudiesStentsVascular ResistanceVascular DiseasesCerebral ArteriesEndotheliumPericytesMesenteric ArteriesVenulesHyperplasiaArteriovenous Shunt, SurgicalVasoconstrictor AgentsVasodilator AgentsBlood Vessel Prosthesis ImplantationPulmonary ArteryProspective StudiesUltrasonography, InterventionalRetrospective StudiesCatheterizationVenous ValvesModels, CardiovascularCatheter Ablation