StrokeIschemic Attack, TransientBrain IschemiaCerebrovascular DisordersRisk FactorsCerebral InfarctionFibrinolytic AgentsCerebral HemorrhageProspective StudiesAcute DiseaseTissue Plasminogen ActivatorTime FactorsFollow-Up StudiesThrombolytic TherapyTreatment OutcomeBrain InfarctionRecurrenceIntracranial HemorrhagesTomography, X-Ray ComputedCarotid StenosisCohort StudiesAnticoagulantsIntracranial EmbolismInfarction, Middle Cerebral ArteryAtrial FibrillationAspirinIntracranial Arterial DiseasesCerebral AngiographyPlatelet Aggregation InhibitorsPredictive Value of TestsIncidenceMagnetic Resonance ImagingSeverity of Illness IndexBrainRetrospective StudiesMagnetic Resonance AngiographyRisk AssessmentNeurologyIntracranial ArteriosclerosisAge FactorsCarotid Artery DiseasesSecondary PreventionEndarterectomy, CarotidEmbolismIntracranial Embolism and ThrombosisCerebrovascular CirculationRiskWarfarinIschemiaPrognosisCase-Control StudiesRecovery of FunctionDiffusion Magnetic Resonance ImagingIntracranial ThrombosisComorbidityCerebral ArteriesAmaurosis FugaxRegistriesHypertensionCarotid Artery, InternalOdds RatioMigraine DisordersNeurologic ExaminationMyocardial InfarctionCyclic Nucleotide Phosphodiesterases, Type 3Multivariate AnalysisRandomized Controlled Trials as TopicMyocardial IschemiaSex FactorsPrevalenceMiddle Cerebral ArteryParesisLogistic ModelsVertebrobasilar InsufficiencyCarotid ArteriesProportional Hazards ModelsArterial Occlusive DiseasesBiological MarkersThromboembolismEmergency Medical ServicesRegression AnalysisCerebral RevascularizationHeparinoidsUltrasonography, Doppler, TranscranialDouble-Blind MethodUnited StatesEndarterectomyHospitalizationHeart DiseasesDipyridamoleDiabetes ComplicationsEchocardiography, TransesophagealStroke, LacunarPrimary PreventionBlood PressureHemorrhageCoronary DiseaseNeuroprotective AgentsTiclopidineInfarction, Posterior Cerebral Artery