Subarachnoid HemorrhageBasilar ArteryCerebral ArteriesVasospasm, IntracranialSubarachnoid SpaceIntracranial AneurysmMiddle Cerebral ArteryCerebral AngiographyArteriesCerebral HemorrhageAneurysm, RupturedInfarction, Middle Cerebral ArteryCerebrovascular CirculationCerebral InfarctionVertebral ArteryHemorrhageBrain IschemiaTomography, X-Ray ComputedPosterior Cerebral ArteryVertebrobasilar InsufficiencyIschemic Attack, TransientAnterior Cerebral ArteryCarotid ArteriesPulmonary ArteryBrainIntracranial HemorrhagesCarotid Artery, InternalRupture, SpontaneousVasoconstrictionUltrasonography, Doppler, TranscranialAngiography, Digital SubtractionCisterna MagnaHydrocephalusEmbolization, TherapeuticMesenteric ArteriesRenal ArteryCerebral Arterial DiseasesFemoral ArteryTreatment OutcomeSubarachnoid Hemorrhage, TraumaticNimodipineArterial Occlusive DiseasesSpinal PunctureTime FactorsCerebrovascular DisordersGlasgow Outcome ScaleMagnetic Resonance AngiographyIntracranial PressureVasodilationCircle of WillisMagnetic Resonance ImagingCarotid Artery DiseasesStrokeDisease Models, AnimalMuscle, Smooth, VascularSurgical InstrumentsBrain Stem InfarctionsBrain EdemaIntracranial Embolism and ThrombosisProspective StudiesDogsIliac ArteryVasodilator AgentsBlood Flow VelocityNeurosurgical ProceduresCoronary Artery BypassRats, Sprague-DawleyRadial ArteryAngiographyPapaverineCraniotomyVertebral Artery DissectionRetrospective StudiesGlasgow Coma ScaleMammary ArteriesVentriculostomyRetinal HemorrhageBlood PressureHematoma, SubduralCerebral RevascularizationCerebral VeinsTemporal ArteriesSubclavian ArteryFollow-Up StudiesIntracranial Arteriovenous MalformationsPia MaterIntracranial ThrombosisAneurysmHeadacheAcute DiseasePregnatrienesRegional Blood FlowArachnoidCarotid Artery, CommonRabbitsVitreous HemorrhageSerotoninSplenic ArteryRisk FactorsCerebral Ventricles