Basilar ArteryIntracranial AneurysmAneurysmAneurysm, InfectedArteriesVertebrobasilar InsufficiencyAortic AneurysmCerebral AngiographyAortic Aneurysm, ThoracicHeart AneurysmSubarachnoid HemorrhageVertebral ArteryAneurysm, DissectingCerebral ArteriesEmbolization, TherapeuticIliac AneurysmTomography, X-Ray ComputedCoronary AneurysmPulmonary ArteryCarotid ArteriesBlood Vessel Prosthesis ImplantationRenal ArteryAngiography, Digital SubtractionAneurysm, FalseBrain Stem InfarctionsCarotid Artery, InternalFemoral ArteryVasospasm, IntracranialAortic RuptureIliac ArteryTreatment OutcomeBlood Vessel ProsthesisMesenteric ArteriesEndovascular ProceduresAorta, AbdominalCarotid Artery DiseasesStentsVasodilationAortographyAngiographyVascular Surgical ProceduresSplenic ArteryVasoconstrictionSubclavian ArteryMuscle, Smooth, VascularArterial Occlusive DiseasesCoronary Artery BypassCircle of WillisCerebrovascular CirculationCeliac ArteryDogsRadial ArteryFollow-Up StudiesMiddle Cerebral ArteryMammary ArteriesMesenteric Artery, SuperiorSurgical InstrumentsTime FactorsRetrospective StudiesCarotid Artery, CommonVasodilator AgentsMagnetic Resonance AngiographyPosterior Cerebral ArteryHepatic ArterySerotoninPostoperative ComplicationsDilatation, PathologicAnterior Cerebral ArteryBrachial ArteryOphthalmic ArteryPopliteal ArteryCoronary VesselsRabbitsPapaverinePotassium ChlorideIntracranial Embolism and ThrombosisMuscle ContractionVasoconstrictor AgentsIntracranial ThrombosisTemporal ArteriesIschemic Attack, TransientProsthesis DesignPicolinesEndothelium, VascularNeurosurgical ProceduresMechanical ThrombolysisUltrasonography, Doppler, TranscranialSumatriptanIntracranial ArteriosclerosisVertebral Artery DissectionMagnetic Resonance ImagingAcetylcholinePonsRenal Artery ObstructionThoracic ArteriesBronchial ArteriesAneurysm, RupturedUlnar ArteryCerebral InfarctionAngioplasty