Basilar ArteryIntracranial AneurysmAneurysmMiosisEmbolization, TherapeuticAneurysm, RupturedArteriesVertebrobasilar InsufficiencyAneurysm, InfectedCerebral AngiographyVertebral ArterySubarachnoid HemorrhageCerebral ArteriesAortic AneurysmCoronary AneurysmIliac AneurysmSplenic ArteryRenal ArteryTomography, X-Ray ComputedAneurysm, DissectingPulmonary ArteryAortic Aneurysm, ThoracicHeart AneurysmCarotid Artery, InternalCarotid ArteriesAngiography, Digital SubtractionBrain Stem InfarctionsBlood Vessel Prosthesis ImplantationFemoral ArteryIliac ArteryVasospasm, IntracranialTreatment OutcomeCarotid Artery DiseasesAneurysm, FalseMesenteric ArteriesAngiographyEndovascular ProceduresSubclavian ArteryVascular Surgical ProceduresStentsBlood Vessel ProsthesisCeliac ArteryVasodilationPopliteal ArteryMesenteric Artery, SuperiorHepatic ArteryVasoconstrictionArterial Occlusive DiseasesMagnetic Resonance AngiographyCircle of WillisAnterior Cerebral ArteryCoronary Artery BypassMuscle, Smooth, VascularAortic RuptureAorta, AbdominalRadial ArteryMiddle Cerebral ArteryPosterior Cerebral ArteryCerebrovascular CirculationBronchial ArteriesMammary ArteriesDogsAortographyOphthalmic ArteryFollow-Up StudiesVasodilator AgentsSurgical InstrumentsRetrospective StudiesCarotid Artery, CommonSerotoninBrachial ArteryTime FactorsCoronary VesselsDilatation, PathologicTemporal ArteriesUlnar ArteryMucocutaneous Lymph Node SyndromePapaverineIntracranial Embolism and ThrombosisVertebral Artery DissectionPotassium ChloridePostoperative ComplicationsRabbitsVascular PatencyVasoconstrictor AgentsMuscle ContractionNeurosurgical ProceduresIschemic Attack, TransientPicolinesIntracranial ThrombosisEndothelium, VascularSumatriptanUltrasonography, Doppler, TranscranialCoronary AngiographyRenal Artery ObstructionCarotid Artery, Internal, DissectionIntracranial ArteriosclerosisAcetylcholineAxillary ArteryConstriction, Pathologic