CraniotomyElectrodesElectrodes, ImplantedNeurosurgical ProceduresPneumocephalusIon-Selective ElectrodesPostoperative ComplicationsFrontal BoneHematoma, Subdural, AcuteTrephiningElectrochemistrySubdural SpaceTreatment OutcomeBrain NeoplasmsDura MaterHead Injuries, PenetratingIntracranial AneurysmMicrosurgeryTomography, X-Ray ComputedHematoma, SubduralDelayed Emergence from AnesthesiaMeningeal NeoplasmsElectrochemical TechniquesSupratentorial NeoplasmsSurgical Fixation DevicesStereotaxic TechniquesMeningiomaFrontal SinusTemporal BoneArachnoid CystsRetrospective StudiesMagnetic Resonance ImagingBariatric SurgeryNeurosurgeryTime FactorsMonitoring, IntraoperativeMicroelectrodesGlasgow Coma ScaleHematoma, Epidural, CranialCerebrospinal Fluid RhinorrheaSurgical InstrumentsHematoma, Subdural, ChronicSurgical FlapsGeneral SurgeryCranial Fossa, AnteriorSurgery, Computer-AssistedEquipment DesignFourth VentriclePreoperative CareDecompression, SurgicalPotentiometryBrain AbscessProspective StudiesThoracic SurgeryAnesthesia, GeneralFluorocarbon PolymersAnesthesiaSkull BaseHematoceleVentriculostomyCerebellar DiseasesGraphiteCardiac Surgical ProceduresElectroencephalographyFollow-Up StudiesBiosensing TechniquesConsciousness MonitorsIntraoperative ComplicationsBrain InjuriesAneurysm, RupturedIntraoperative CareCerebral AngiographySubarachnoid HemorrhageSkull FracturesCranial Nerve NeoplasmsSkull Base NeoplasmsConscious SedationElectric StimulationReoperationNeuronavigationPostoperative PeriodSurgical Procedures, Minimally InvasiveBrain DiseasesOrbitCerebral VeinsGoldIntracranial HemorrhagesPropofolSurgery, PlasticNeuroendoscopySkullEpilepsyCochlear ImplantationCochlear ImplantsAnesthetics, IntravenousConductometryCraniopharyngiomaElectric ImpedanceFentanylAnterior Cerebral Artery