Basilar ArteryCarotid ArteriesCarotid Artery DiseasesCarotid Artery, InternalCarotid Artery, CommonCarotid StenosisArteriesCarotid Artery, ExternalEndarterectomy, CarotidCarotid Artery ThrombosisCerebral ArteriesVertebrobasilar InsufficiencyVertebral ArteryPulmonary ArteryCerebral AngiographyFemoral ArteryCarotid Artery, Internal, DissectionRenal ArteryMesenteric ArteriesCarotid BodyArterial Occlusive DiseasesCarotid SinusTunica IntimaMagnetic Resonance AngiographyCoronary Artery BypassStentsSubclavian ArteryIliac ArteryMuscle, Smooth, VascularRadial ArterySubarachnoid HemorrhageCerebrovascular CirculationVasodilationCarotid Artery InjuriesIschemic Attack, TransientIntracranial AneurysmAngiography, Digital SubtractionMammary ArteriesAngiographyTunica MediaTomography, X-Ray ComputedVasoconstrictionBrachial ArteryMiddle Cerebral ArteryBrain Stem InfarctionsAngioplasty, BalloonCarotid Intima-Media ThicknessUltrasonography, Doppler, DuplexVasospasm, IntracranialTreatment OutcomeOphthalmic ArteryCircle of WillisArteriosclerosisCoronary VesselsBrain IschemiaSplenic ArteryIntracranial ArteriosclerosisUltrasonography, Doppler, TranscranialCerebrovascular DisordersVasodilator AgentsEndothelium, VascularStrokeDogsHepatic ArteryTime FactorsIntracranial Embolism and ThrombosisAngioplastyEndarterectomyAneurysmCerebral InfarctionTemporal ArteriesEmbolization, TherapeuticBlood PressureRisk FactorsCeliac ArteryRegional Blood FlowRabbitsCatheterizationMesenteric Artery, SuperiorProspective StudiesUmbilical ArteriesConstriction, PathologicBlood Flow VelocityIntracranial EmbolismRenal Artery ObstructionFollow-Up StudiesVasoconstrictor AgentsThoracic ArteriesAneurysm, RupturedRetinal Artery OcclusionSerotoninUltrasonography, Doppler, ColorAcetylcholineCerebral RevascularizationUltrasonographyBronchial ArteriesRetrospective StudiesPopliteal ArteryInjections, Intra-ArterialHemodynamics