Ischemic Attack, TransientStrokeCerebrovascular DisordersBrain IschemiaCarotid StenosisRisk FactorsAspirinCerebral InfarctionProspective StudiesRecurrenceEndarterectomy, CarotidCarotid Artery, InternalCarotid Artery DiseasesIntracranial Embolism and ThrombosisFollow-Up StudiesIntracranial EmbolismTime FactorsCerebral AngiographyTreatment OutcomeDipyridamoleFibrinolytic AgentsPlatelet Aggregation InhibitorsAtrial FibrillationMagnetic Resonance AngiographyUltrasonography, Doppler, TranscranialAnticoagulantsRisk AssessmentEchocardiography, TransesophagealTomography, X-Ray ComputedPrognosisCarotid ArteriesSeverity of Illness IndexCohort StudiesGreat BritainCerebrovascular CirculationRetrospective StudiesPredictive Value of TestsAge FactorsIncidenceAcute DiseaseReferral and ConsultationCerebral HemorrhagePatient SelectionEmbolismEnglandBrain InfarctionMyocardial IschemiaVertebrobasilar InsufficiencyTissue Plasminogen ActivatorMagnetic Resonance ImagingIschemiaThrombolytic TherapyMyocardial InfarctionIntracranial HemorrhagesIntracranial Arterial DiseasesInfarction, Middle Cerebral ArteryNeurologyBrainAmaurosis FugaxMigraine DisordersCardiovascular DiseasesWarfarinIntracranial ArteriosclerosisRecovery of FunctionRiskDiffusion Magnetic Resonance ImagingHypertensionCerebral ArteriesNeurologic ExaminationParesis