Anesthesia, EpiduralAnesthesia, ObstetricalAnesthesia, GeneralSpinal CordAnesthesia, SpinalAnesthesiaAnesthetics, LocalLidocaineAnesthesia, ConductionBupivacaineAnesthesia, LocalMepivacaineSpinal Cord InjuriesAnesthetics, CombinedAnesthesia, CaudalAnesthesia, InhalationCesarean SectionProcaineAnesthesia, IntravenousAnalgesia, EpiduralAutonomic Nerve BlockAdjuvants, AnesthesiaShiveringEpidural SpacePain, PostoperativeEtilefrineAnesthesia Recovery PeriodFentanylMonitoring, IntraoperativeSkin TemperatureLumbosacral RegionNerve BlockThoracic VertebraeEphedrineAnesthesia, DentalAnesthetics, InhalationHorner SyndromeMethyl EthersThoraxEpinephrineIsofluraneAmidesInjections, SpinalAnesthetics, IntravenousPuerperal DisordersDihydroergotaminePropofolPain MeasurementInjections, EpiduralRitodrineHemodynamicsPregnancySpinal NervesBody Temperature RegulationSpinal Cord DiseasesMeperidineLabor Stage, FirstLabor, ObstetricHypothermiaAnesthesiologySpinal Nerve RootsAnalgesia, ObstetricalAnalgesiaSensationBlood PressureSpinal Cord NeoplasmsSpinal CanalPostoperative ComplicationsNitrous OxideSpinal DiseasesHeart RateSpinal Cord CompressionAnestheticsSurgical Procedures, OperativeProspective StudiesIntraoperative PeriodSpinal NeoplasmsLumbosacral PlexusTime FactorsPiroxicamHypotensionAnalgesics, OpioidDouble-Blind MethodDiagnostic Techniques, NeurologicalHalothaneSpinal StenosisSpinal FusionBlood CirculationBack PainPainMorphineSympathetic Fibers, PostganglionicDura MaterAnalgesia, Patient-ControlledPostoperative PeriodAnesthesia, Closed-CircuitAnesthetics, GeneralHysterectomyKetamineMesenteric Veins