Cerebral AngiographyCerebral VentriclesInjections, IntraventricularAngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionCoronary AngiographyCerebral ArteriesShiveringIntracranial AneurysmAnemarrhenaPempidineCerebral InfarctionCisterna MagnaIntracranial Arteriovenous MalformationsSubarachnoid HemorrhageTomography, X-Ray ComputedPhysostigmineInjectionsBody Temperature RegulationBrainCerebrovascular CirculationCerebral VeinsCranial SinusesVertebral ArteryCarotid Artery, InternalMoyamoya DiseaseCerebral HemorrhageBody TemperaturePosterior Cerebral ArteryIschemic Attack, TransientCerebrovascular DisordersCircle of WillisCentral Nervous System Vascular MalformationsMiddle Cerebral ArteryAneurysm, RupturedBrain IschemiaMagnetic Resonance ImagingHypothalamusFluorescein AngiographyIntracranial Embolism and ThrombosisCerebral RevascularizationBasilar ArteryVasospasm, IntracranialEmbolization, TherapeuticArterial Occlusive DiseasesCerebral Arterial DiseasesCatsAnterior Cerebral ArteryCerebral PalsyNorepinephrineInjections, IntravenousVasculitis, Central Nervous SystemCarotid Artery DiseasesContrast MediaCarotid StenosisAtropineVertebrobasilar InsufficiencySinus Thrombosis, IntracranialIntracranial ArteriosclerosisCraniotomySerotoninBlindness, CorticalArteriovenous FistulaEpilepsy, Tonic-ClonicCollateral CirculationEndarterectomyArteriovenous MalformationsBlood Flow VelocityNeurosurgical ProceduresCarotid ArteriesNeurologic ExaminationBlood PressureIntracranial EmbolismHematoma, SubduralSensitivity and SpecificityInfarction, Middle Cerebral ArteryCranial Fossa, AnteriorProspective StudiesTreatment OutcomeLateral Medullary SyndromeConstriction, PathologicCarotid-Cavernous Sinus FistulaCavernous SinusVertebral Artery DissectionSheepRats, WistarSurgical InstrumentsMalaria, CerebralTemporal ArteriesHematoma, Subdural, IntracranialTime FactorsFollow-Up StudiesRetrospective StudiesComaHeadacheAmyotrophic Lateral SclerosisIntracranial HemorrhagesHematomaHeart Rate