Vasospasm, IntracranialSubarachnoid HemorrhageBasilar ArteryCoronary VasospasmIschemic Attack, TransientCerebral ArteriesCerebral AngiographyCisterna MagnaPapaverineIntracranial AneurysmAneurysm, RupturedCerebrovascular CirculationNimodipineUltrasonography, Doppler, TranscranialMiddle Cerebral ArteryVasoconstrictionCerebral InfarctionInjections, Intra-ArterialSubarachnoid SpaceDogsInfusions, Intra-ArterialVasodilator AgentsBrainDisease Models, AnimalNicardipine1-(5-Isoquinolinesulfonyl)-2-MethylpiperazineBrain IschemiaAngiography, Digital SubtractionChlorobutanolSpasmInjections, IntraventricularVentriculostomyOxyhemoglobinsTomography, X-Ray ComputedCerebral PalsyRupture, SpontaneousBlood Flow VelocityRabbitsCerebrospinal FluidMuscle, Smooth, VascularTreatment OutcomePipecolic AcidsErgonovineInfusion PumpsCerebral VeinsGlasgow Coma Scalerho-Associated KinasesTime FactorsCalcium Channel BlockersAngiographySerotoninInfarction, Middle Cerebral ArteryThromboxane-A SynthaseRats, Sprague-DawleyInjectionsEndothelin-1Vasoconstrictor AgentsPregnatrienesMalaria, CerebralVascular PatencyReceptor, PAR-1Cerebral HemorrhageMethacrylatesDose-Response Relationship, DrugAngina Pectoris, VariantAnterior Cerebral ArteryVasodilationRetrospective StudiesMyosin Light ChainsRegional Blood FlowNitric Oxide Synthase Type IIIMuscle ContractionInjections, SpinalEnzyme InhibitorsCarotid ArteriesHemodynamicsHSP72 Heat-Shock ProteinsPerfusion ImagingAmidesIntracranial PressureSerine Proteinase InhibitorsPosterior Cerebral ArteryBlood PressureDioxanesAntithrombin IIIIofetamineBrain EdemaTetrazolesPyridinesBloodProspective Studies