Anesthesia, EpiduralAnalgesiaAnesthesia, ObstetricalAnalgesia, EpiduralAnesthesia, GeneralAnesthesia, SpinalAnesthetics, LocalAnalgesia, ObstetricalSpinal CordAnesthesiaBupivacaineLidocaineAnesthesia, ConductionAnesthesia, LocalAnalgesia, Patient-ControlledPain, PostoperativeMepivacaineAnesthetics, CombinedAnesthesia, CaudalSpinal Cord InjuriesInjectionsAnalgesics, OpioidCesarean SectionFentanylPain MeasurementAnesthesia, InhalationAnesthesia, IntravenousProcaineNerve BlockAdjuvants, AnesthesiaAutonomic Nerve BlockInjections, SpinalMorphineEpidural SpaceMeperidineAmidesAnesthesia Recovery PeriodShiveringAnesthesia, DentalInjections, EpiduralMonitoring, IntraoperativeEtilefrineLumbosacral RegionLabor, ObstetricSkin TemperatureThoracic VertebraePainEphedrineAnesthetics, InhalationPregnancyEpinephrineMethyl EthersThoraxHorner SyndromeAnalgesicsLabor Stage, FirstDouble-Blind MethodIsofluraneAnesthetics, IntravenousInjections, IntravenousPropofolAcupuncture AnalgesiaPuerperal DisordersHemodynamicsTime FactorsProspective StudiesSufentanilSpinal NervesNitrous OxideDihydroergotamineRitodrineBody Temperature RegulationAnesthesiologyBlood PressureSpinal Nerve RootsHypothermiaPostoperative ComplicationsSpinal Cord DiseasesKetamineSensationHeart RateInjections, IntramuscularAnestheticsPiroxicamDose-Response Relationship, DrugIntraoperative PeriodSurgical Procedures, OperativeHypotensionLabor PainLumbosacral PlexusSpinal DiseasesSpinal Cord NeoplasmsSpinal CanalConscious SedationHysterectomySpinal Cord CompressionAmbulatory Surgical ProceduresThoracotomyTreatment OutcomeRats, Sprague-Dawley