Graft Occlusion, VascularVascular PatencyVeinsSaphenous VeinBlood Vessel ProsthesisPolytetrafluoroethyleneConstriction, PathologicGraft SurvivalUltrasonography, Doppler, DuplexArterial Occlusive DiseasesVascular GraftingLegCarotid StenosisVascular Surgical ProceduresPopliteal ArteryBlood Vessel Prosthesis ImplantationIschemiaTreatment OutcomeReoperationAortic Valve StenosisFemoral ArteryCoronary Artery BypassTime FactorsJugular VeinsCoronary StenosisFollow-Up StudiesCoronary OcclusionArteriovenous Shunt, SurgicalBalloon OcclusionAmputationSpinal StenosisAngioplasty, BalloonRetinal Artery OcclusionRetinal Vein OcclusionLife TablesRetrospective StudiesTracheal StenosisPostoperative ComplicationsPolyethylene TerephthalatesAnastomosis, SurgicalStentsProspective StudiesHyperplasiaTibial ArteriesPopliteal VeinCoronary AngiographyPyloric StenosisMitral Valve StenosisPulmonary Valve StenosisThrombosisCarotid Artery, InternalDental OcclusionTunica IntimaTomography, X-Ray ComputedLower ExtremityRisk FactorsFemoral VeinInguinal CanalInternal Mammary-Coronary Artery AnastomosisCoronary-Subclavian Steal SyndromeBrain IschemiaLimb SalvageAngiographyIntermittent ClaudicationInfarction, Middle Cerebral ArteryPeripheral Vascular DiseasesCollateral CirculationCerebral AngiographyMesenteric Vascular OcclusionBlood Flow VelocityRenal Artery ObstructionAspirinMagnetic Resonance AngiographyDogsIschemic Attack, TransientConstrictionIliac ArteryCoronary CirculationCerebral InfarctionCoronary DiseaseFibrinolytic AgentsArteriesAngiography, Digital SubtractionCerebral ArteriesCarotid Artery DiseasesHemodynamicsCoronary VesselsKidney TransplantationCatheterizationCerebrovascular CirculationVertebrobasilar InsufficiencyEndarterectomy, CarotidDental Occlusion, CentricEmbolization, TherapeuticTherapeutic OcclusionMarylandProsthesis DesignDisease Models, AnimalRecurrenceSeverity of Illness Index