Subarachnoid HemorrhageBasilar ArteryThrombinNeisseria mucosaSubarachnoid SpaceIntracranial AneurysmCerebral HemorrhageAneurysm, RupturedCerebral AngiographyCerebral ArteriesHemorrhageArteriesReceptors, ThrombinVertebrobasilar InsufficiencyVertebral ArteryTomography, X-Ray ComputedIntracranial HemorrhagesRupture, SpontaneousSubarachnoid Hemorrhage, TraumaticHydrocephalusCerebrovascular CirculationCisterna MagnaIschemic Attack, TransientSpinal PunctureGlasgow Outcome ScaleAngiography, Digital SubtractionEmbolization, TherapeuticBrain IschemiaNimodipineBrain Stem InfarctionsTreatment OutcomeCarotid ArteriesVasoconstrictionCerebral InfarctionIntracranial PressureSurgical InstrumentsCarotid Artery, InternalPulmonary ArteryTime FactorsRetinal HemorrhageVentriculostomyMiddle Cerebral ArteryGlasgow Coma ScaleProspective StudiesUltrasonography, Doppler, TranscranialNeurosurgical ProceduresVertebral Artery DissectionBrainDogsCerebrovascular DisordersVasodilationHematoma, SubduralVitreous HemorrhagePapaverineMagnetic Resonance AngiographyThrombin TimeMuscle, Smooth, VascularFemoral ArteryMesenteric ArteriesReceptor, PAR-1Retrospective StudiesCraniotomyMagnetic Resonance ImagingPosterior Cerebral ArteryRenal ArteryVasodilator AgentsPostpartum HemorrhageHeadacheArachnoidDisease Models, AnimalAngiographyPregnatrienesRabbitsSerotoninIntracranial Hemorrhage, HypertensiveGastrointestinal HemorrhageCircle of WillisHirudinsComaStrokeCarotid Artery DiseasesHematomaIntracranial Arteriovenous MalformationsFollow-Up StudiesAneurysmRisk FactorsFatal OutcomeAcute DiseaseCerebrospinal FluidArterial Occlusive DiseasesEye HemorrhageBrain EdemaCerebral VentriculographyVentriculoperitoneal ShuntBlood PlateletsIntracranial ThrombosisCerebral VentriclesHeadache Disorders, PrimaryRats, Sprague-DawleyIliac Artery