CraniotomyPropofolAnesthetics, IntravenousNeurosurgical ProceduresPneumocephalusAdministration, OralHypnotics and SedativesConscious SedationFrontal BoneHematoma, Subdural, AcuteTrephiningAnesthesia, GeneralConsciousness MonitorsMonitoring, IntraoperativeBrain NeoplasmsDelayed Emergence from AnesthesiaFentanylHead Injuries, PenetratingAnesthesiaAnesthetics, CombinedAnesthesia Recovery PeriodHematoma, SubduralSupratentorial NeoplasmsIntracranial AneurysmDura MaterDose-Response Relationship, DrugMeningeal NeoplasmsSurgical Fixation DevicesThiopentalAnesthetics, InhalationFrontal SinusMeningiomaMethyl EthersArachnoid CystsSubdural SpaceMicrosurgeryDrug Administration ScheduleTime FactorsTomography, X-Ray ComputedAlfentanilInjections, IntravenousElectroencephalographyPiperidinesMidazolamGlasgow Coma ScaleIsofluraneHematoma, Epidural, CranialDeep SedationHematoma, Subdural, ChronicCerebrospinal Fluid RhinorrheaMagnetic Resonance ImagingFourth VentriclePostoperative ComplicationsTemporal BoneInfusions, IntravenousStereotaxic TechniquesCranial Fossa, AnteriorRats, Sprague-DawleyBrain AbscessEtomidateNeurosurgeryMethohexitalHematoceleSurgical InstrumentsBrainBrain InjuriesUnited States Food and Drug AdministrationCerebellar DiseasesAnesthetics, GeneralVentriculostomySurgical FlapsDouble-Blind MethodTreatment OutcomeAnestheticsRats, WistarSkull BaseDrug Administration RoutesCranial Nerve NeoplasmsSkull FracturesSubarachnoid HemorrhageNitrous OxideCerebral AngiographyAneurysm, RupturedDrug InteractionsSkull Base NeoplasmsIntracranial HemorrhagesDecompression, SurgicalCerebral VeinsBrain DiseasesBlood PressureConsciousnessKetamineProspective StudiesCraniopharyngiomaAnterior Cerebral ArteryOrbitSkullAnesthetics, DissociativeCranial Fossa, MiddleNeuroendoscopy