Basilar ArteryIntracranial AneurysmEmbolization, TherapeuticAneurysm, RupturedCerebral AngiographyPosterior Cerebral ArterySubarachnoid HemorrhageAneurysmAneurysm, InfectedArteriesVertebrobasilar InsufficiencyAortic AneurysmAortic Aneurysm, ThoracicHeart AneurysmVertebral ArteryAneurysm, DissectingCerebral ArteriesIliac AneurysmTreatment OutcomeTomography, X-Ray ComputedCoronary AneurysmPulmonary ArteryCarotid ArteriesBlood Vessel Prosthesis ImplantationRenal ArteryAngiography, Digital SubtractionAneurysm, FalseBrain Stem InfarctionsCarotid Artery, InternalFemoral ArteryVasospasm, IntracranialAortic RuptureIliac ArteryBlood Vessel ProsthesisMesenteric ArteriesEndovascular ProceduresAorta, AbdominalStentsCarotid Artery DiseasesVasodilationAortographyAngiographyVascular Surgical ProceduresSplenic ArteryVasoconstrictionSubclavian ArteryMuscle, Smooth, VascularArterial Occlusive DiseasesCoronary Artery BypassCircle of WillisCeliac ArteryCerebrovascular CirculationRadial ArteryDogsMiddle Cerebral ArteryMesenteric Artery, SuperiorMammary ArteriesFollow-Up StudiesSurgical InstrumentsCarotid Artery, CommonVasodilator AgentsRetrospective StudiesMagnetic Resonance AngiographyTime FactorsHepatic ArterySerotoninPostoperative ComplicationsDilatation, PathologicAnterior Cerebral ArteryBrachial ArteryOphthalmic ArteryPopliteal ArteryCoronary VesselsRabbitsPapaverinePotassium ChlorideIntracranial Embolism and ThrombosisVasoconstrictor AgentsMuscle ContractionIntracranial ThrombosisTemporal ArteriesPicolinesIschemic Attack, TransientEndothelium, VascularProsthesis DesignMechanical ThrombolysisUltrasonography, Doppler, TranscranialSumatriptanIntracranial ArteriosclerosisNeurosurgical ProceduresVertebral Artery DissectionAcetylcholineRenal Artery ObstructionThoracic ArteriesBronchial ArteriesAngioplastyUlnar ArteryCerebral InfarctionRetreatmentVascular Patency