Speech DisordersIschemic Attack, TransientSpeechStrokeCerebrovascular DisordersCarotid StenosisSpeech PerceptionEndarterectomy, CarotidAspirinCarotid Artery DiseasesRecurrenceCarotid Artery, InternalBrain IschemiaRisk FactorsIntracranial Embolism and ThrombosisProspective StudiesCerebral InfarctionSpeech IntelligibilityIntracranial EmbolismSpeech AcousticsFollow-Up StudiesTime FactorsCerebral AngiographyDipyridamoleUltrasonography, Doppler, TranscranialSpeech Production MeasurementTreatment OutcomePlatelet Aggregation InhibitorsMagnetic Resonance AngiographyAtrial FibrillationSpeech TherapyEchocardiography, TransesophagealCarotid ArteriesRisk AssessmentAnticoagulantsGreat BritainAudiometry, SpeechReferral and ConsultationPrognosisTomography, X-Ray ComputedSeverity of Illness IndexFibrinolytic AgentsRetrospective StudiesCerebrovascular CirculationEnglandPatient SelectionAge FactorsPredictive Value of TestsCohort StudiesPhoneticsSpeech Articulation TestsIncidenceSpeech Discrimination TestsVertebrobasilar InsufficiencyEmbolismSpeech Recognition Software