Carotid StenosisCarotid Artery, InternalCarotid ArteriesStrokeCarotid Artery DiseasesEndarterectomy, CarotidCarotid Artery, CommonBrain IschemiaCarotid Artery, ExternalUltrasonography, Doppler, DuplexRenal Artery ObstructionCarotid Artery ThrombosisAngiography, Digital SubtractionStentsCerebrovascular DisordersMagnetic Resonance AngiographyIschemic Attack, TransientAngiographyAngioplastyConstriction, PathologicAngioplasty, BalloonCoronary StenosisCerebral AngiographyRisk FactorsArteriesUltrasonography, Doppler, ColorProspective StudiesArterial Occlusive DiseasesTreatment OutcomeIntracranial EmbolismEndarterectomyUltrasonography, Doppler, TranscranialBlood Flow VelocityCerebral InfarctionTomography, X-Ray ComputedSeverity of Illness IndexFollow-Up StudiesPredictive Value of TestsAortic Valve StenosisCerebral ArteriesRenal ArterySensitivity and SpecificityCerebrovascular CirculationIntracranial ArteriosclerosisTime FactorsAmaurosis FugaxRetrospective StudiesUltrasonography, DopplerArteriosclerosisCarotid Artery, Internal, DissectionIntracranial Embolism and ThrombosisHypertension, RenovascularUltrasonographyRecurrenceTunica IntimaCarotid BodyObserver VariationRisk AssessmentEmbolismOphthalmic ArteryPostoperative ComplicationsSpinal StenosisMiddle Cerebral ArteryPulmonary ArteryReproducibility of ResultsVertebral ArteryCoronary AngiographyVertebrobasilar InsufficiencyFibrinolytic AgentsCarotid SinusPulmonary Valve StenosisBlood PressureTunica MediaMagnetic Resonance ImagingAsymptomatic DiseasesTracheal StenosisCoronary Artery BypassCerebral RevascularizationTissue Plasminogen ActivatorDoppler EffectInfarction, Middle Cerebral ArteryFemoral ArteryHemodynamicsAtherosclerosisCalcinosisCerebral HemorrhageAcute DiseaseBasilar ArteryIliac ArteryCatheterizationCollateral CirculationRetinal Artery OcclusionEmbolic Protection DevicesThrombolytic TherapyCarotid Intima-Media ThicknessCoronary DiseasePlaque, AtheroscleroticIntracranial Arterial DiseasesCohort StudiesHypertension