Ischemic Attack, TransientStrokeBrain IschemiaCerebrovascular DisordersRisk FactorsCerebral InfarctionCerebral HemorrhageFibrinolytic AgentsProspective StudiesTime FactorsAcute DiseaseFollow-Up StudiesTissue Plasminogen ActivatorCarotid StenosisTreatment OutcomeTomography, X-Ray ComputedIntracranial EmbolismThrombolytic TherapyRecurrenceBrain InfarctionCohort StudiesIntracranial ArteriosclerosisIntracranial HemorrhagesRetrospective StudiesCarotid Artery DiseasesPredictive Value of TestsCerebral AngiographyInfarction, Middle Cerebral ArteryIntracranial Arterial DiseasesEndarterectomy, CarotidAnticoagulantsMagnetic Resonance ImagingIncidenceIntracranial ThrombosisSeverity of Illness IndexNeurologyAspirinAtrial FibrillationPlatelet Aggregation InhibitorsMagnetic Resonance AngiographyCerebrovascular CirculationIntracranial Embolism and ThrombosisRiskEmbolismBrainCerebral ArteriesAge FactorsComorbiditySecondary PreventionDiffusion Magnetic Resonance ImagingRisk AssessmentRegistriesCarotid Artery, InternalWarfarinVertebrobasilar InsufficiencyPrognosisCarotid ArteriesEndarterectomyCerebral RevascularizationSensitivity and SpecificityCase-Control StudiesEarly DiagnosisOdds RatioEmergency Medical ServicesUltrasonography, Doppler, TranscranialMoyamoya DiseaseNeurologic ExaminationInfarction, Posterior Cerebral ArteryRecovery of FunctionMultivariate AnalysisAmaurosis FugaxHypertensionParesisLogistic ModelsProportional Hazards ModelsMigraine DisordersForamen Ovale, PatentSex FactorsNeuroprotective AgentsReproducibility of ResultsArterial Occlusive DiseasesUnited StatesMiddle Cerebral ArteryReperfusionVascular DiseasesDelayed DiagnosisPrevalenceCerebral Arterial DiseasesBiological MarkersIschemiaEchocardiography, TransesophagealCarotid Artery ThrombosisRandomized Controlled Trials as TopicMyocardial InfarctionRegression AnalysisHospitalizationAngiographyNervous System DiseasesPrenatal DiagnosisTiclopidine