Preoperative CareSpinal CordAnesthesia, GeneralAnesthesiaAnesthesia, SpinalAnesthesia, LocalSpinal Cord InjuriesAnesthesia, EpiduralAnesthesia, ConductionAnesthesia, InhalationPreoperative PeriodAnesthesia, IntravenousAnesthesia, ObstetricalAnesthesia Recovery PeriodAnesthesia, DentalInjections, SpinalAnesthetics, IntravenousAnesthetics, InhalationAdjuvants, AnesthesiaPropofolAnesthetics, LocalMonitoring, IntraoperativeSpinal Cord DiseasesAnesthesiologySpinal NervesPostoperative ComplicationsIsofluraneMethyl EthersSpinal Nerve RootsSpinal Cord NeoplasmsAnesthetics, CombinedSpinal CanalSpinal Cord CompressionTreatment OutcomeSpinal DiseasesSpinal NeoplasmsNitrous OxideSpinal FusionAnestheticsRetrospective StudiesLidocaineSpinal StenosisHalothaneProspective StudiesBupivacaineAmbulatory Surgical ProceduresPostoperative PeriodIntraoperative ComplicationsPreanesthetic MedicationFentanylTime FactorsIntraoperative PeriodPain, PostoperativeNerve BlockAnesthesia, Closed-CircuitAnesthetics, GeneralKetamineThoracic VertebraePain MeasurementSpinal InjuriesThiopentalAnesthesia, CaudalAnesthesia Department, HospitalIntraoperative CareMuscular Atrophy, SpinalSpinal Cord IschemiaSurgical Procedures, OperativeSpinePostoperative CareLaminectomyPentobarbitalIntubation, IntratrachealFollow-Up StudiesSurgical Procedures, ElectiveConscious SedationAnesthetics, DissociativeLumbar VertebraeGanglia, SpinalEnfluraneTomography, X-Ray ComputedXylazineRectal NeoplasmsCervical VertebraeCesarean SectionParaplegiaMagnetic Resonance ImagingMotor NeuronsAnesthesia, IntratrachealPainLumbosacral RegionAnalgesics, OpioidRecovery of FunctionTuberculosis, SpinalSpinal CurvaturesRats, Sprague-DawleyPremedicationHematoma, Epidural, SpinalOrthopedic ProceduresElectroencephalographyPrilocaine