Subarachnoid HemorrhageBasilar ArteryVasospasm, IntracranialSubarachnoid SpaceIntracranial AneurysmCerebral HemorrhageAneurysm, RupturedCerebral AngiographyPeptidesCerebral ArteriesHemorrhageArteriesVertebrobasilar InsufficiencyVertebral ArteryTomography, X-Ray ComputedIntracranial HemorrhagesRupture, SpontaneousSubarachnoid Hemorrhage, TraumaticHydrocephalusCerebrovascular CirculationCisterna MagnaSpinal PunctureIschemic Attack, TransientGlasgow Outcome ScaleAngiography, Digital SubtractionEmbolization, TherapeuticBrain IschemiaNimodipineBrain Stem InfarctionsTreatment OutcomeVasoconstrictionCerebral InfarctionCarotid ArteriesIntracranial PressureSurgical InstrumentsCarotid Artery, InternalTime FactorsPulmonary ArteryRetinal HemorrhageVentriculostomyMiddle Cerebral ArteryGlasgow Coma ScaleBrainProspective StudiesUltrasonography, Doppler, TranscranialDogsNeurosurgical ProceduresVertebral Artery DissectionCerebrovascular DisordersVasodilationHematoma, SubduralVitreous HemorrhageMagnetic Resonance AngiographyPapaverineMesenteric ArteriesMuscle, Smooth, VascularVasodilator AgentsRetrospective StudiesCraniotomyMagnetic Resonance ImagingRenal ArteryDisease Models, AnimalPeptide FragmentsPosterior Cerebral ArteryHeadachePostpartum HemorrhageFemoral ArteryArachnoidPregnatrienesRabbitsAngiographyIntracranial Hemorrhage, HypertensiveCircle of WillisGastrointestinal HemorrhageComaStrokeCarotid Artery DiseasesFollow-Up StudiesIntracranial Arteriovenous MalformationsHematomaAneurysmSerotoninPeptide LibraryFatal OutcomeRisk FactorsAcute DiseaseCerebrospinal FluidArterial Occlusive DiseasesRats, Sprague-DawleyEye HemorrhagePeptides, CyclicCerebral VentriculographyVentriculoperitoneal ShuntCerebral VentriclesBrain EdemaHeadache Disorders, PrimaryIliac ArteryIntracranial ThrombosisNeurosurgeryPons