Basilar ArteryIntracranial AneurysmEmbolization, TherapeuticAneurysm, RupturedPosterior Cerebral ArteryCerebral AngiographySubarachnoid HemorrhageAneurysmAneurysm, InfectedArteriesVertebrobasilar InsufficiencyAortic AneurysmAortic Aneurysm, ThoracicHeart AneurysmVertebral ArteryAneurysm, DissectingCerebral ArteriesTreatment OutcomeIliac AneurysmTomography, 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 DiseasesVasodilationAngiographyAortographyVascular Surgical ProceduresSplenic ArteryVasoconstrictionSubclavian ArteryMuscle, Smooth, VascularArterial Occlusive DiseasesCoronary Artery BypassCircle of WillisCeliac ArteryCerebrovascular CirculationRadial ArteryDogsMiddle Cerebral ArteryMesenteric Artery, SuperiorMammary ArteriesSurgical InstrumentsFollow-Up StudiesCarotid Artery, CommonVasodilator AgentsRetrospective StudiesTime FactorsMagnetic Resonance AngiographyHepatic ArterySerotoninPostoperative ComplicationsDilatation, PathologicAnterior Cerebral ArteryBrachial ArteryOphthalmic ArteryPopliteal ArteryCoronary VesselsRabbitsPapaverinePotassium ChlorideIntracranial Embolism and ThrombosisVasoconstrictor AgentsMuscle ContractionIntracranial ThrombosisTemporal ArteriesPicolinesEndothelium, VascularIschemic Attack, TransientProsthesis DesignMechanical ThrombolysisUltrasonography, Doppler, TranscranialNeurosurgical ProceduresSumatriptanIntracranial ArteriosclerosisVertebral Artery DissectionAcetylcholineRenal Artery Obstruction