Ischemic Attack, TransientStrokeCerebrovascular DisordersCarotid StenosisBrain IschemiaEndarterectomy, CarotidRecurrenceCarotid Artery DiseasesCarotid Artery, InternalRisk FactorsProspective StudiesCerebral InfarctionIntracranial EmbolismAspirinFollow-Up StudiesTime FactorsIntracranial Embolism and ThrombosisCerebral AngiographyTreatment OutcomeUltrasonography, Doppler, TranscranialDipyridamolePlatelet Aggregation InhibitorsCarotid ArteriesMagnetic Resonance AngiographyAtrial FibrillationRisk AssessmentEchocardiography, TransesophagealTomography, X-Ray ComputedSeverity of Illness IndexAnticoagulantsPrognosisFibrinolytic AgentsCerebrovascular CirculationRetrospective StudiesGreat BritainPredictive Value of TestsCohort StudiesVertebrobasilar InsufficiencyIncidenceReferral and ConsultationEnglandAge FactorsPatient SelectionEmbolismAcute DiseaseIntracranial ArteriosclerosisCerebral HemorrhageSecondary PreventionEndarterectomyMagnetic Resonance ImagingStentsDiffusion Magnetic Resonance ImagingMyocardial InfarctionBrainAngioplastyAngioplasty, BalloonCardiovascular DiseasesBrain InfarctionNeurologyMyocardial IschemiaParesisIntracranial HemorrhagesIntracranial Arterial DiseasesPostoperative ComplicationsRiskInfarction, Middle Cerebral ArteryTriageIschemiaCerebral ArteriesTissue Plasminogen ActivatorWarfarinAmaurosis FugaxMigraine DisordersThrombolytic TherapyRecovery of FunctionEmergency Medical ServicesComorbidityStroke VolumeRegistriesHypertensionFeasibility StudiesIntracranial ThrombosisNeurologic ExaminationComplement Membrane Attack ComplexStroke, LacunarHemiplegiaMoyamoya DiseaseForamen Ovale, PatentInfarction, Posterior Cerebral ArterySex FactorsArterial Occlusive DiseasesBlood PressureCerebral RevascularizationCalciumBlood Vessel Prosthesis ImplantationSulfinpyrazoneSensitivity and SpecificityProportional Hazards ModelsHeart DiseasesCoronary Disease