Ischemic Attack, TransientStrokeCarotid StenosisCerebrovascular DisordersCarotid Artery DiseasesEndarterectomy, CarotidCarotid Artery, InternalCarotid ArteriesBrain IschemiaRecurrencePrognosisRisk FactorsAspirinProspective StudiesCerebral InfarctionIntracranial Embolism and ThrombosisFollow-Up StudiesIntracranial EmbolismCerebral AngiographyTime FactorsTreatment OutcomePlatelet Aggregation InhibitorsUltrasonography, Doppler, TranscranialMagnetic Resonance AngiographyDipyridamoleAtrial FibrillationAnticoagulantsRisk AssessmentEchocardiography, TransesophagealTomography, X-Ray ComputedRetrospective StudiesCerebrovascular CirculationPredictive Value of TestsCohort StudiesEndarterectomyEmbolismVertebrobasilar InsufficiencySeverity of Illness IndexFibrinolytic AgentsAge FactorsIntracranial ArteriosclerosisGreat BritainIncidenceCarotid Artery, CommonReferral and ConsultationIntracranial Arterial DiseasesAmaurosis FugaxNeurologyPatient SelectionCarotid Artery ThrombosisSecondary PreventionMoyamoya DiseaseCarotid Artery, ExternalCarotid BodyEnglandCerebral HemorrhageCerebral ArteriesMagnetic Resonance ImagingArterial Occlusive DiseasesCarotid SinusRiskAcute DiseaseMigraine DisordersDiffusion Magnetic Resonance ImagingForamen Ovale, PatentStentsUltrasonography, Doppler, DuplexAngioplastyEmergency Medical ServicesWarfarinAuscultationMyocardial InfarctionInfarction, Posterior Cerebral ArteryAngiographyReflex, BabinskiCerebral RevascularizationSulfinpyrazonePostoperative ComplicationsBrainComorbidityIntracranial HemorrhagesCardiovascular DiseasesHypertensionTiclopidineConstriction, PathologicNeurologic ExaminationUltrasonographyRegistriesIntracranial ThrombosisArteriosclerosisAngioplasty, BalloonCarotid Artery, Internal, DissectionBrain InfarctionVascular DiseasesBlindnessMyocardial IschemiaHeart DiseasesMultivariate AnalysisComplement Membrane Attack ComplexIschemia