Anesthesia, SpinalAnesthesia, ObstetricalAnesthesia, GeneralAnesthesiaSensationAnesthesia, EpiduralAnesthesia, LocalBupivacaineAnesthetics, LocalSpinal CordAnesthesia, ConductionAnesthesia, InhalationCesarean SectionAnesthesia, IntravenousAnesthesia Recovery PeriodAdjuvants, AnesthesiaEphedrineAdministration, InhalationLidocaineSpinal Cord InjuriesAnesthesia, DentalHypotensionAnesthetics, InhalationInhalation ExposureAnesthetics, IntravenousAnesthetics, CombinedTetracaineInjections, SpinalPropofolNerve BlockAmbulatory Surgical ProceduresMepivacaineMonitoring, IntraoperativeFentanylSpecific GravityPrilocaineIsofluranePain, PostoperativeAnestheticsSmoke Inhalation InjurySurgical Procedures, MinorAnesthesiologyMethyl EthersDouble-Blind MethodNitrous OxideBurns, InhalationIntraoperative ComplicationsPreanesthetic MedicationCarticaineHalothaneConscious SedationInhalationProspective StudiesPostoperative Nausea and VomitingPost-Dural Puncture HeadachePain MeasurementShiveringKetamineSpinal PunctureSufentanilAnalgesics, OpioidPregnancyAnesthesia, Closed-CircuitSpinal Nerve RootsIsotonic SolutionsHernia, InguinalTime FactorsAmidesAnesthetics, GeneralHemodynamicsFemoral NervePlasma SubstitutesSensation DisordersHydroxyethyl Starch DerivativesThiopentalHeart RateMidazolamAnesthesia, CaudalIntraoperative PeriodNeedlesConsciousnessPostoperative ComplicationsEnfluraneThermosensingHypnotics and SedativesBlood PressureSpinal Cord DiseasesSpinal NervesPentobarbitalIntubation, IntratrachealMorphineAnesthetics, DissociativeEtilefrineSubarachnoid SpaceElectroencephalographyXylazineDose-Response Relationship, DrugLumbosacral RegionApgar ScoreParesthesia