Vasospasm, IntracranialBaroreflexSubarachnoid HemorrhageBasilar ArteryCerebral ArteriesIschemic Attack, TransientCisterna MagnaCerebral AngiographyPapaverineIntracranial AneurysmCoronary VasospasmCerebrovascular CirculationAneurysm, RupturedNimodipineMiddle Cerebral ArteryCerebral InfarctionUltrasonography, Doppler, TranscranialVasoconstrictionBlood PressureDogsHeart RateVasodilator AgentsInjections, Intra-ArterialBrainDisease Models, AnimalPressoreceptorsSubarachnoid SpaceInfusions, Intra-ArterialSympathetic Nervous System1-(5-Isoquinolinesulfonyl)-2-MethylpiperazineInjections, IntraventricularBrain IschemiaChlorobutanolCerebral PalsyNicardipinePhenylephrineAngiography, Digital SubtractionRabbitsOxyhemoglobinsVentriculostomyVasoconstrictor AgentsRupture, SpontaneousTomography, X-Ray ComputedCarotid SinusCerebrospinal FluidRats, Sprague-DawleyBlood Flow VelocityMuscle, Smooth, VascularTreatment OutcomeTime FactorsInfusion PumpsPipecolic AcidsCerebral VeinsInfarction, Middle Cerebral ArteryCarotid ArteriesMalaria, CerebralInjectionsHemodynamicsVagus NerveAutonomic Nervous Systemrho-Associated KinasesNitroprussideGlasgow Coma ScaleAngiographyCalcium Channel BlockersThromboxane-A SynthaseSpasmReflexDose-Response Relationship, DrugSerotoninCerebral HemorrhageReceptor, PAR-1Endothelin-1Vascular PatencyRegional Blood FlowMethacrylatesSolitary NucleusBradycardiaArteriesEnzyme InhibitorsValsalva ManeuverMuscle ContractionNitric Oxide Synthase Type IIIVasodilationAnterior Cerebral ArteryRetrospective StudiesInjections, SpinalMyosin Light ChainsVasomotor SystemHSP72 Heat-Shock ProteinsTetrazolesSerine Proteinase InhibitorsDenervationConsciousnessTrimethaphanAmidesCardiovascular SystemErgonovineAntithrombin IIISupine Position