CraniotomyElectrodesElectrodes, ImplantedNeurosurgical ProceduresPneumocephalusIon-Selective ElectrodesFrontal BoneHematoma, Subdural, AcuteTrephiningElectrochemistrySubdural SpaceHead Injuries, PenetratingBrain NeoplasmsDelayed Emergence from AnesthesiaElectrochemical TechniquesHematoma, SubduralDura MaterIntracranial AneurysmSurgical Fixation DevicesMeningeal NeoplasmsSupratentorial NeoplasmsFrontal SinusStereotaxic TechniquesMeningiomaArachnoid CystsTemporal BoneMicrosurgeryTomography, X-Ray ComputedMicroelectrodesGlasgow Coma ScaleHematoma, Epidural, CranialHematoma, Subdural, ChronicCerebrospinal Fluid RhinorrheaMagnetic Resonance ImagingCranial Fossa, AnteriorFourth VentriclePotentiometryNeurosurgeryBrain AbscessPostoperative ComplicationsFluorocarbon PolymersHematoceleSurgical InstrumentsGraphiteBiosensing TechniquesCerebellar DiseasesEquipment DesignVentriculostomySurgical FlapsBrain InjuriesSkull BaseConsciousness MonitorsElectroencephalographyCranial Nerve NeoplasmsSkull FracturesMonitoring, IntraoperativeElectric StimulationCerebral AngiographySubarachnoid HemorrhageAneurysm, RupturedGoldSkull Base NeoplasmsConscious SedationCerebral VeinsIntracranial HemorrhagesDecompression, SurgicalCochlear ImplantsConductometryCraniopharyngiomaCochlear ImplantationBrain DiseasesSkullElectric ImpedanceAnesthesiaAnterior Cerebral ArteryEnzymes, ImmobilizedOrbitCranial Fossa, MiddleNeuroendoscopyIntracranial Hemorrhage, HypertensiveNeuronavigationEpilepsy