Carotid Artery, ExternalCarotid ArteriesCarotid Artery DiseasesCarotid Artery, InternalCarotid StenosisCarotid Artery, CommonEndarterectomy, CarotidCarotid Artery ThrombosisCarotid BodyArteriesCarotid SinusCerebral AngiographyCarotid Artery, Internal, DissectionVertebral ArteryMetergolineTunica IntimaUltrasonography, Doppler, DuplexMaxillary ArteryCarotid Artery InjuriesTunica MediaCerebral ArteriesEndarterectomyCarotid Intima-Media ThicknessStentsArterial Occlusive DiseasesCerebral RevascularizationAngiography, Digital SubtractionAngiographyCarotid Body TumorIschemic Attack, TransientCerebrovascular CirculationMagnetic Resonance AngiographyEmbolization, TherapeuticAngioplasty, BalloonArteriosclerosisAmaurosis FugaxCavernous SinusSubclavian ArteryFemoral ArteryCerebrovascular DisordersBlood Flow VelocityPulmonary ArteryOphthalmic ArteryTomography, X-Ray Computed5-MethoxytryptamineBrain IschemiaAngioplastyTemporal ArteriesCollateral CirculationIntracranial Embolism and ThrombosisBasilar ArteryMiddle Cerebral ArteryRegional Blood FlowUltrasonography, Doppler, ColorUltrasonography, Doppler, TranscranialTreatment OutcomeMeningeal ArteriesNeckStrokeRenal ArteryBlood PressureLigationMesenteric ArteriesRisk FactorsSumatriptanEpistaxisTime FactorsInjections, Intra-ArterialProspective StudiesHemodynamicsDissectionConstrictionUltrasonographyIntracranial EmbolismCatheterizationMoyamoya DiseaseArteriovenous FistulaCentral Nervous System Vascular MalformationsMuscle, Smooth, VascularCoronary Artery BypassDogsRadial ArteryAtherosclerosisPostoperative ComplicationsFollow-Up StudiesBrachial ArteryIntracranial ArteriosclerosisSympathectomyIliac ArteryAneurysmRetrospective StudiesCerebral InfarctionCircle of WillisIntracranial AneurysmMethiothepinVascular Surgical ProceduresMammary ArteriesMagnetic Resonance ImagingVasoconstrictionUltrasonography, Doppler