Subarachnoid HemorrhageSubarachnoid SpaceVasospasm, IntracranialIntracranial AneurysmAneurysm, RupturedCerebral AngiographyBasilar ArterySubarachnoid Hemorrhage, TraumaticCisterna MagnaSpinal PunctureArachnoidHydrocephalusCerebral ArteriesTomography, X-Ray ComputedRupture, SpontaneousGlasgow Outcome ScaleIntracranial PressureAnesthesia, SpinalIschemic Attack, TransientSurgical InstrumentsCerebral HemorrhageCerebrovascular CirculationCerebrospinal FluidArachnoiditisNimodipineVentriculostomyMeningesBrain IschemiaAngiography, Digital SubtractionEmbolization, TherapeuticHematoma, SubduralCerebral VentriculographyNeurosurgical ProceduresPregnatrienesVertebral ArteryCraniotomyGlasgow Coma ScaleCerebral InfarctionBrainHeadacheCerebral VentriclesTreatment OutcomeDura MaterMagnetic Resonance ImagingVentriculoperitoneal ShuntVertebral Artery DissectionCerebrospinal Fluid PressureProspective StudiesTime FactorsNeurosurgeryHeadache Disorders, PrimaryCerebral AqueductAnesthesia, ObstetricalCerebrovascular DisordersIntracranial HypertensionInjections, SpinalConsciousness DisordersCortical Spreading DepressionCerebrospinal Fluid ShuntsSubdural SpaceBupivacaineUltrasonography, Doppler, TranscranialHemosiderinIntracranial HemorrhagesDisease Models, AnimalRetrospective StudiesPapaverineBrain EdemaVasoconstrictionMiddle Cerebral ArteryPneumocephalusPosterior Cerebral ArteryBrain InjuriesMagnesium SulfatePia MaterIntracranial Arteriovenous MalformationsMyelographyArachnoid CystsCranial Fossa, PosteriorSiderosisFourth VentricleDogsNeurologic ExaminationBlood-Brain BarrierFollow-Up StudiesHead Injuries, ClosedAminocaproatesSyringomyeliaExtravasation of Diagnostic and Therapeutic MaterialsAneurysmFatal OutcomeMeningitisComaIncidenceAnesthetics, LocalAngiographyIntracranial Hemorrhage, HypertensiveArnold-Chiari MalformationPneumoencephalographyAcute Disease