Cerebral VentriclesSubarachnoid HemorrhageSubarachnoid SpaceVasoconstrictionCerebrospinal FluidInjections, IntraventricularCerebral HemorrhageCisterna MagnaFourth VentricleHemorrhageVasospasm, IntracranialShiveringCerebral ArteriesHeart VentriclesCerebrospinal Fluid ProteinsBrainHydrocephalusIntracranial AneurysmCerebral AngiographyIntracranial HemorrhagesInjectionsBody TemperatureCerebral InfarctionCerebrovascular CirculationBody Temperature RegulationLateral VentriclesBlood PressureAneurysm, RupturedEpendymaDogsNorepinephrinePerfusionHypothalamusCatsBasilar ArteryThird VentriclePempidineTime FactorsSpinal PunctureChoroid PlexusRetinal HemorrhageCerebral Ventricle NeoplasmsTomography, X-Ray ComputedRats, Sprague-DawleyHypnosis, AnestheticMiddle Cerebral ArteryPhysostigmineConsciousnessCerebrospinal Fluid RhinorrheaHexamethonium CompoundsSerotoninCerebrospinal Fluid PressureCerebrospinal Fluid ShuntsBrain IschemiaIntracranial PressureTranylcypromineCharadriiformesCerebral PalsyRats, WistarMagnetic Resonance ImagingMeningitisPhentolamineRegional Blood FlowHeart RatePostpartum HemorrhageDose-Response Relationship, DrugArachnoidHistamine AgentsPyrogensCerebral VentriculographyInjections, IntravenousCerebral VeinsVascular ResistanceVitreous HemorrhageGastrointestinal HemorrhageIschemic Attack, TransientVentriculostomyRabbitsHemodynamicsRupture, SpontaneousSympathetic Nervous SystemArteriolesEye HemorrhageReserpineDrinkingLysergic Acid DiethylamideInfarction, Middle Cerebral ArteryPentobarbitalAnoxiaDisease Models, AnimalAsparaginasePulmonary CirculationMalaria, CerebralAtropineBrain DiseasesRats, Inbred StrainsParasympathomimeticsFeverCerebrovascular DisordersBlood Flow Velocity