Basilar ArteryIntracranial AneurysmEmbolization, TherapeuticAneurysm, RupturedPosterior Cerebral ArteryCerebral AngiographySubarachnoid HemorrhageAneurysmAneurysm, InfectedArteriesVertebrobasilar InsufficiencyAortic AneurysmCerebral ArteriesVertebral ArteryAortic Aneurysm, ThoracicHeart AneurysmAneurysm, DissectingTreatment OutcomeIliac AneurysmTomography, X-Ray ComputedCarotid Artery, InternalArterial Occlusive DiseasesCarotid ArteriesAngiography, Digital SubtractionBlood Vessel Prosthesis ImplantationCoronary AneurysmPulmonary ArteryRenal ArteryFemoral ArteryAneurysm, FalseBrain Stem InfarctionsIliac ArteryBalloon OcclusionVasospasm, IntracranialCarotid Artery DiseasesStentsBlood Vessel ProsthesisAortic RuptureEndovascular ProceduresAngiographyMesenteric ArteriesAorta, AbdominalRetinal Artery OcclusionVasodilationCerebrovascular CirculationCoronary OcclusionVascular Surgical ProceduresDogsAortographySubclavian ArteryTime FactorsSplenic ArteryVasoconstrictionCircle of WillisMiddle Cerebral ArteryMuscle, Smooth, VascularCoronary Artery BypassFollow-Up StudiesRetinal Vein OcclusionMagnetic Resonance AngiographyCeliac ArteryRetrospective StudiesSurgical InstrumentsMesenteric Artery, SuperiorBrain IschemiaIschemic Attack, TransientRadial ArteryCerebral InfarctionCoronary VesselsCarotid Artery, CommonVasodilator AgentsMammary ArteriesInfarction, Middle Cerebral ArteryPostoperative ComplicationsPopliteal ArteryHepatic ArteryOphthalmic ArteryIntracranial Embolism and ThrombosisBrachial ArteryRabbitsAnterior Cerebral ArteryIntracranial ThrombosisDisease Models, AnimalSerotoninDilatation, PathologicVascular PatencyCerebral Arterial DiseasesConstriction, PathologicMechanical ThrombolysisCerebral RevascularizationUltrasonography, Doppler, TranscranialCollateral CirculationRegional Blood FlowPapaverineProsthesis DesignEndothelium, VascularTemporal ArteriesDental OcclusionPotassium ChlorideVasoconstrictor Agents