Subarachnoid HemorrhageVasospasm, IntracranialSubarachnoid SpaceCoronary VasospasmBasilar ArteryIntracranial AneurysmCerebral AngiographyAneurysm, RupturedCisterna MagnaIschemic Attack, TransientCerebral ArteriesTomography, X-Ray ComputedPapaverineRupture, SpontaneousNimodipineCerebrovascular CirculationSpasmUltrasonography, Doppler, TranscranialSubarachnoid Hemorrhage, TraumaticAngiography, Digital SubtractionHydrocephalusPregnatrienesGlasgow Outcome ScaleSpinal PunctureIntracranial PressureArachnoidVentriculostomyVasoconstrictionSurgical InstrumentsBrain IschemiaNicardipineCerebrospinal FluidAnesthesia, SpinalMiddle Cerebral ArteryEmbolization, TherapeuticTreatment OutcomeBrainGlasgow Coma ScaleCerebral HemorrhageErgonovineVasodilator AgentsCerebral InfarctionCraniotomyVertebral ArteryDogsInfusions, Intra-ArterialDisease Models, AnimalNeurosurgical ProceduresArachnoiditisTime FactorsDioxanesMeningesPerfusion ImagingHeadache Disorders, PrimaryHematoma, SubduralInjections, Intra-ArterialProspective StudiesCerebral VentriculographyHeadacheCortical Spreading DepressionAngina Pectoris, VariantIntracranial Hypertension1-(5-Isoquinolinesulfonyl)-2-MethylpiperazineMagnetic Resonance ImagingRetrospective StudiesConsciousness DisordersInjections, SpinalMagnesium SulfateAnterior Cerebral ArteryCerebrovascular DisordersAngiographyBlood Flow VelocityCerebral VentriclesPia MaterInjections, IntraventricularPosterior Cerebral ArteryRabbitsCarotid Artery, InternalCerebrospinal Fluid ProteinsBrain InjuriesNeurologic ExaminationBrain EdemaDura MaterVentriculoperitoneal ShuntVertebral Artery DissectionIofetamineOxyhemoglobinsCerebrospinal Fluid PressureHemodilutionMuscle, Smooth, VascularIntracranial Arteriovenous MalformationsNeurosurgeryCerebral AqueductAnesthesia, ObstetricalMagnetic Resonance AngiographyPredictive Value of TestsSerotoninAcute DiseaseEndothelin-1Aneurysm