Subarachnoid HemorrhageBasilar ArteryIntracranial AneurysmAneurysmVasospasm, IntracranialSubarachnoid SpaceAneurysm, RupturedCerebral AngiographyArteriesEmbolization, TherapeuticCerebral ArteriesCerebral HemorrhageTomography, X-Ray ComputedVertebral ArteryAneurysm, InfectedCoronary AneurysmSplenic ArteryHemorrhageIliac AneurysmAngiography, Digital SubtractionVertebrobasilar InsufficiencyRenal ArteryCarotid Artery, InternalRupture, SpontaneousTreatment OutcomeAortic AneurysmPulmonary ArteryAneurysm, DissectingCarotid ArteriesSurgical InstrumentsAngiographyFemoral ArteryIliac ArteryCarotid Artery DiseasesBlood Vessel Prosthesis ImplantationCerebrovascular CirculationEndovascular ProceduresIntracranial HemorrhagesVascular Surgical ProceduresHydrocephalusAortic Aneurysm, ThoracicAnterior Cerebral ArteryIschemic Attack, TransientGlasgow Outcome ScaleHeart AneurysmPopliteal ArteryCeliac ArterySubclavian ArteryAneurysm, FalseNeurosurgical ProceduresSubarachnoid Hemorrhage, TraumaticMiddle Cerebral ArteryMesenteric ArteriesCisterna MagnaHepatic ArteryTime FactorsRetrospective StudiesMesenteric Artery, SuperiorVertebral Artery DissectionSpinal PunctureMagnetic Resonance AngiographyStentsPosterior Cerebral ArteryBrain IschemiaFollow-Up StudiesVasoconstrictionBlood Vessel ProsthesisCerebral InfarctionCircle of WillisCraniotomyBrain Stem InfarctionsBronchial ArteriesNimodipineCoronary Artery BypassProspective StudiesRadial ArteryIntracranial PressureArterial Occlusive DiseasesMagnetic Resonance ImagingVasodilationPostoperative ComplicationsOphthalmic ArteryGlasgow Coma ScaleDogsMucocutaneous Lymph Node SyndromeMuscle, Smooth, VascularMammary ArteriesUltrasonography, Doppler, TranscranialIntracranial Arteriovenous MalformationsVentriculostomyFatal OutcomeRisk FactorsCarotid Artery, Internal, DissectionCerebrovascular DisordersHematomaRetinal HemorrhageCarotid Artery, CommonVasodilator AgentsBrainAorta, Abdominal