AnalgesiaAnalgesia, EpiduralAnalgesia, Patient-ControlledAnalgesia, ObstetricalPain, PostoperativeAnalgesics, OpioidBupivacaineAnesthetics, LocalFentanylPain MeasurementMorphineDesulfitobacteriumTetrachloroethyleneAcupuncture AnalgesiaLabor, ObstetricAnalgesicsAmidesAnesthesia, EpiduralCesarean SectionPostoperative Nausea and VomitingMeperidineLabor PainSufentanilPainDouble-Blind MethodNerve BlockInjections, SpinalAnesthesia, ObstetricalAnesthesia, SpinalTramadolGram-Negative Aerobic BacteriaAnalgesics, Non-NarcoticPregnancyNaloxoneOxidoreductasesPain ThresholdInterpleural AnalgesiaPatient SatisfactionDrug ToleranceReceptors, Opioid, muAnesthesia, GeneralConscious SedationKetorolacLabor Stage, FirstHydromorphoneLidocainePain ManagementAnesthesia, CaudalClonidineAnesthesia and AnalgesiaKetamineFemoral NerveReceptors, OpioidPirinitramideHypnotics and SedativesButorphanolAlfentanilNalbuphineNarcotic AntagonistsAnesthetics, CombinedAnesthesia, ConductionThoracotomyOpioid PeptidesElectroacupunctureMepivacainePruritusKetoprofenAdjuvants, AnesthesiaPlacebo EffectMorphine DerivativesHyperalgesiaTreatment OutcomeProspective StudiesAnesthesia, LocalPeriaqueductal GrayNitrous OxidePentazocinePostoperative CareDexmedetomidineAmbulatory Surgical ProceduresHysterectomyPiperidinesDose-Response Relationship, DrugBrachial PlexusPain, IntractableOxycodonePain PerceptionInjections, EpiduralAcetaminophenAnesthesia, IntravenousAnesthetics, DissociativePrilocaineNociceptorsDelivery, ObstetricObstetric Labor ComplicationsNeostigmineNociceptive PainInjections, IntravenousExtraction, ObstetricalDipyrone