Anesthesia, SpinalSpinal CordAnesthesia, ObstetricalAnesthesia, GeneralBupivacaineSpinal Cord InjuriesAnesthetics, LocalAnesthesiaAnesthesia, EpiduralCesarean SectionAnesthesia, LocalEphedrineInjections, SpinalAnesthesia, ConductionAdjuvants, AnesthesiaAnesthesia Recovery PeriodLidocaineAnesthesia, InhalationHypotensionTetracaineAnesthesia, IntravenousSpinal Nerve RootsSpecific GravitySpinal NervesMepivacaineNerve BlockSpinal Cord DiseasesAmbulatory Surgical ProceduresAnesthetics, CombinedSpinal Cord NeoplasmsSpinal CanalPrilocainePain, PostoperativeSensationSpinal DiseasesSpinal Cord CompressionFentanylSurgical Procedures, MinorMonitoring, IntraoperativeAnesthetics, IntravenousSpinal PunctureSpinal NeoplasmsPropofolPost-Dural Puncture HeadacheAnesthesia, DentalDouble-Blind MethodCarticaineSpinal StenosisIntraoperative ComplicationsSpinal FusionShiveringProspective StudiesPostoperative Nausea and VomitingPregnancyIsotonic SolutionsSufentanilAnalgesics, OpioidPain MeasurementLumbosacral RegionAnesthetics, InhalationFemoral NerveHernia, InguinalSpinal InjuriesPlasma SubstitutesConscious SedationAnestheticsHydroxyethyl Starch DerivativesMuscular Atrophy, SpinalPreanesthetic MedicationAmidesSubarachnoid SpaceIsofluraneSpinal Cord IschemiaMethyl EthersTime FactorsGanglia, SpinalAnesthesiologyMorphineEtilefrineKetamineHematoma, Subdural, IntracranialLabor PainCerebrospinal Fluid PressureNeedlesLumbar VertebraePost and Core TechniqueMotor NeuronsApgar ScoreNitrous OxidePostoperative ComplicationsSpineThoracic VertebraeHemodynamicsTransurethral Resection of ProstateParaplegiaHallux VarusMidazolamPhenylephrineTuberculosis, SpinalOrthopedic Procedures