Basilar ArteryMigraine DisordersMigraine with AuraMigraine without AuraArteriesVertebrobasilar InsufficiencyCerebral ArteriesVertebral ArteryPulmonary ArteryCarotid ArteriesSubarachnoid HemorrhageBrain Stem InfarctionsCerebral AngiographySumatriptanVasospasm, IntracranialMesenteric ArteriesRenal ArteryFemoral ArteryVasodilationVasoconstrictionTryptaminesCarotid Artery, InternalHeadacheIntracranial AneurysmMuscle, Smooth, VascularIliac ArteryCoronary Artery BypassCerebrovascular CirculationVasodilator AgentsMagnetic Resonance AngiographyRadial ArteryArterial Occlusive DiseasesMammary ArteriesSerotoninDogsHeadache DisordersCarotid Artery DiseasesMiddle Cerebral ArterySubclavian ArteryTension-Type HeadacheTomography, X-Ray ComputedVasoconstrictor AgentsPotassium ChlorideCircle of WillisSplenic ArteryBrachial ArteryTreatment OutcomePapaverineCoronary VesselsUltrasonography, Doppler, TranscranialMuscle ContractionHepatic ArteryCarotid Artery, CommonPicolinesIschemic Attack, TransientRabbitsEndothelium, VascularAcetylcholineAngiography, Digital SubtractionCeliac ArteryIntracranial Embolism and ThrombosisPhotophobiaIntracranial ArteriosclerosisAneurysm, RupturedOphthalmic ArteryPonsMesenteric Artery, SuperiorSerotonin Receptor AgonistsEmbolization, TherapeuticTemporal ArteriesCortical Spreading DepressionCerebral InfarctionAngiographyMeningeal ArteriesUmbilical ArteriesErgotamineRenal Artery ObstructionNitroglycerinThoracic ArteriesVasomotor SystemPosterior Cerebral ArteryDose-Response Relationship, DrugBrain StemDihydroergotamineBronchial ArteriesTime FactorsNitroprussidePopliteal ArteryMuscle RelaxationUlnar ArteryCalcitonin Gene-Related PeptideMagnetic Resonance ImagingSubclavian Steal SyndromeFlunarizineComaStentsRats, Sprague-DawleyRegional Blood FlowInfusions, Intra-ArterialCerebrovascular Disorders