Subarachnoid HemorrhageVasospasm, IntracranialIntracranial AneurysmCerebral AngiographyAneurysm, RupturedBasilar ArteryIschemic Attack, TransientSubarachnoid SpaceGlasgow Outcome ScaleCerebral ArteriesHydrocephalusCisterna MagnaRupture, SpontaneousMagnesium SulfateTomography, X-Ray ComputedVentriculostomyCoronary VasospasmBrain IschemiaNimodipinePregnatrienesUltrasonography, Doppler, TranscranialSpinal PunctureCerebrovascular CirculationCerebral HemorrhageAngiography, Digital SubtractionGlasgow Coma ScaleTreatment OutcomeSurgical InstrumentsProspective StudiesHypovolemiaIntracranial HypertensionCortical Spreading DepressionVentriculoperitoneal ShuntCerebral InfarctionNicardipineDioxanesHemorrhageIntracranial PressurePapaverineNeurosurgical ProceduresTime FactorsThird VentriclePerfusion ImagingRetrospective StudiesPituitary Function TestsMicrodialysisBrain