Subarachnoid HemorrhageBasilar ArteryVasospasm, IntracranialSubarachnoid SpaceIntracranial AneurysmCerebral HemorrhageAneurysm, RupturedCerebellumCerebral AngiographyHemorrhageCerebral ArteriesTomography, X-Ray ComputedIntracranial HemorrhagesRupture, SpontaneousSubarachnoid Hemorrhage, TraumaticVertebral ArteryHydrocephalusSpinal PunctureGlasgow Outcome ScaleCisterna MagnaCerebrovascular CirculationIschemic Attack, TransientArteriesVertebrobasilar InsufficiencyBrain IschemiaAngiography, Digital SubtractionIntracranial PressureEmbolization, TherapeuticNimodipineSurgical InstrumentsBrainCerebral InfarctionRetinal HemorrhageVentriculostomyTreatment OutcomeGlasgow Coma ScaleVitreous HemorrhageHematoma, SubduralNeurosurgical ProceduresTime FactorsProspective StudiesVertebral Artery DissectionCraniotomyVasoconstrictionCerebrovascular DisordersMagnetic Resonance ImagingPostpartum HemorrhagePregnatrienesArachnoidUltrasonography, Doppler, TranscranialBrain Stem InfarctionsMiddle Cerebral ArteryHeadacheIntracranial Hemorrhage, HypertensiveCarotid Artery, InternalGastrointestinal HemorrhageRetrospective StudiesHematomaPapaverineDisease Models, AnimalCarotid ArteriesPosterior Cerebral ArteryDogsIntracranial Arteriovenous MalformationsMagnetic Resonance AngiographyEye HemorrhageCerebral VentriculographyVentriculoperitoneal ShuntCerebral VentriclesStrokeCerebrospinal FluidAngiographyFatal OutcomeHeadache Disorders, PrimaryBrain EdemaComaNeurosurgeryFollow-Up StudiesRisk FactorsIntracranial HypertensionAcute DiseaseAneurysmPutaminal HemorrhageConsciousness DisordersCortical Spreading DepressionMeningesVasodilator AgentsVasodilationCircle of WillisPulmonary ArteryRecurrenceRabbitsBrain InjuriesNeurologic ExaminationHemosiderinMagnesium SulfateMuscle, Smooth, VascularAnterior Cerebral ArteryRats, Sprague-DawleyIncidence