Ischemic Attack, TransientCarotid StenosisEndarterectomy, CarotidStrokeCarotid Artery DiseasesCarotid ArteriesRisk FactorsIntracranial EmbolismCarotid Artery, InternalCerebrovascular DisordersUltrasonography, Doppler, TranscranialAngioplastyStentsEndarterectomyFollow-Up StudiesProspective StudiesBrain IschemiaTreatment OutcomeTime FactorsUltrasonography, Doppler, DuplexCerebral AngiographyCarotid Artery, CommonMagnetic Resonance AngiographyRecurrenceConstriction, PathologicAngiographyIntracranial ArteriosclerosisCerebral InfarctionAmaurosis FugaxSeverity of Illness IndexPredictive Value of TestsTomography, X-Ray ComputedRisk AssessmentRetrospective StudiesAngioplasty, BalloonCerebrovascular CirculationAngiography, Digital SubtractionAspirinEmbolismPlatelet Aggregation InhibitorsIntracranial Embolism and ThrombosisPostoperative ComplicationsAortic Valve StenosisCarotid Artery ThrombosisCarotid Artery, ExternalIntracranial Arterial DiseasesArterial Occlusive DiseasesVertebrobasilar InsufficiencyAuscultationCohort StudiesCerebral RevascularizationUltrasonography, Doppler, ColorAge FactorsNeurologyBlood Flow VelocityUltrasonographyMagnetic Resonance ImagingUltrasonography, DopplerComorbiditySensitivity and SpecificityAnticoagulantsIncidenceSecondary PreventionCerebral ArteriesRiskCoronary StenosisTiclopidineMoyamoya DiseaseAtrial FibrillationCarotid BodySpinal StenosisArteriosclerosisPatient SelectionCerebral HemorrhageDiffusion Magnetic Resonance ImagingCarotid SinusRandomized Controlled Trials as TopicTracheal StenosisAtherosclerosisHypertensionObserver VariationReproducibility of ResultsOdds RatioPrevalenceForamen Ovale, PatentWarfarinInfarction, Posterior Cerebral ArteryEmergency Medical ServicesPrognosisBrainMultivariate AnalysisReflex, BabinskiMigraine DisordersSex FactorsRegistriesAcetazolamideLogistic ModelsCranial Nerve InjuriesMiddle Cerebral ArteryPyloric Stenosis