SufentanilAnesthesia, GeneralAnesthesiaFentanylAnesthesia, SpinalAnesthesia, IntravenousAnesthesia, LocalAnesthesia, EpiduralAnalgesia, ObstetricalAnesthesia, InhalationAnalgesics, OpioidAnesthesia, ObstetricalAnesthetics, IntravenousAnesthesia, ConductionBupivacaineAnalgesia, EpiduralAnestheticsAnesthesia Recovery PeriodAdjuvants, AnesthesiaAnesthetics, LocalAnesthetics, CombinedAlfentanilAnesthesia, DentalPropofolPreanesthetic MedicationInjections, SpinalAnesthetics, InhalationPain, PostoperativeIsofluraneMethyl EthersNitrous OxideDouble-Blind MethodLabor, ObstetricMonitoring, IntraoperativeAnesthesiologyLabor Stage, FirstKetamineCesarean SectionHalothaneAnalgesia, Patient-ControlledIntubation, IntratrachealMidazolamAnalgesiaAmidesPostoperative Nausea and VomitingPain MeasurementSubarachnoid SpaceLidocaineProspective StudiesIntraoperative ComplicationsMorphineHypnotics and SedativesPiperidinesConscious SedationAnesthesia, Closed-CircuitPruritusHemodynamicsInfusions, IntravenousConsciousnessAnesthetics, GeneralInjections, EpiduralElectroencephalographyPregnancy