Ischemic Attack, TransientStrokeRecurrenceCerebrovascular DisordersBrain IschemiaCarotid StenosisRisk FactorsAspirinEndarterectomy, CarotidCerebral InfarctionCarotid Artery DiseasesProspective StudiesCarotid Artery, InternalIntracranial Embolism and ThrombosisIntracranial EmbolismFollow-Up StudiesTime FactorsCerebral AngiographyTreatment OutcomeDipyridamoleUltrasonography, Doppler, TranscranialPlatelet Aggregation InhibitorsMagnetic Resonance AngiographyFibrinolytic AgentsAtrial FibrillationEchocardiography, TransesophagealAnticoagulantsRisk AssessmentCarotid ArteriesTomography, X-Ray ComputedPrognosisGreat BritainSeverity of Illness IndexRetrospective StudiesCerebrovascular CirculationCohort StudiesPredictive Value of TestsReferral and ConsultationIncidenceAge FactorsAcute DiseasePatient SelectionCerebral HemorrhageEnglandEmbolismVertebrobasilar InsufficiencyTissue Plasminogen ActivatorThrombolytic TherapyBrain InfarctionIntracranial ArteriosclerosisMagnetic Resonance ImagingIntracranial HemorrhagesInfarction, Middle Cerebral ArteryIntracranial Arterial DiseasesIntracranial ThrombosisMyocardial InfarctionIschemiaBrainNeurologyMyocardial IschemiaCerebral ArteriesCardiovascular DiseasesRiskSecondary PreventionDiffusion Magnetic Resonance ImagingWarfarinComorbidityEndarterectomyMigraine DisordersRegistriesCerebral RevascularizationAmaurosis FugaxEmergency Medical ServicesCase-Control StudiesNeurologic ExaminationRecovery of FunctionHypertensionMoyamoya DiseaseOdds RatioInfarction, Posterior Cerebral ArteryArterial Occlusive DiseasesNeuroprotective AgentsComplement Membrane Attack ComplexReperfusionParesisForamen Ovale, PatentMultivariate Analysis