Basilar ArteryIntracranial AneurysmAneurysmCerebral AngiographyCerebral ArteriesAneurysm, RupturedSubarachnoid HemorrhageEmbolization, TherapeuticArteriesVertebrobasilar InsufficiencyVertebral ArteryAneurysm, InfectedAngiography, Digital SubtractionSurgical InstrumentsAortic AneurysmTomography, X-Ray ComputedVasospasm, IntracranialCarotid ArteriesCerebrovascular CirculationPulmonary ArteryCarotid Artery, InternalMiddle Cerebral ArteryBrain Stem InfarctionsAneurysm, DissectingCerebral InfarctionRenal ArteryTreatment OutcomeMagnetic Resonance AngiographyCircle of WillisFemoral ArteryEndovascular ProceduresAortic Aneurysm, ThoracicHeart AneurysmMesenteric ArteriesCarotid Artery DiseasesIliac ArteryVasodilationNeurosurgical ProceduresVasoconstrictionAnterior Cerebral ArteryMuscle, Smooth, VascularPlatinumStentsAngiographyIliac AneurysmArterial Occlusive DiseasesBlood Vessel Prosthesis ImplantationCarotid Artery, CommonMicrosurgeryCoronary Artery BypassVascular Surgical ProceduresSubclavian ArteryBrain IschemiaIntracranial ThrombosisCraniotomyBlood Vessel ProsthesisDogsFollow-Up StudiesOphthalmic ArterySplenic ArteryAneurysm, FalseRadial ArteryCoronary AneurysmRetrospective StudiesVasodilator AgentsBrainMammary ArteriesCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientMagnetic Resonance ImagingSerotoninTime FactorsInfarction, Middle Cerebral ArteryModels, CardiovascularIntracranial Embolism and ThrombosisRetreatmentRupture, SpontaneousImaging, Three-DimensionalCeliac ArteryPostoperative ComplicationsPapaverineHepatic ArteryMesenteric Artery, SuperiorBrachial ArteryGlasgow Outcome ScaleAortic RuptureDisease Models, AnimalBlood Flow VelocityAorta, AbdominalCerebral RevascularizationCerebrovascular DisordersPotassium ChlorideCerebral PalsyCoronary VesselsRabbitsVasoconstrictor AgentsCerebral VeinsMuscle ContractionPicolines