AnalgesiaAnalgesia, EpiduralAnalgesia, ObstetricalAnalgesia, Patient-ControlledAnalgesics, OpioidPain, PostoperativeMorphinePain MeasurementBupivacaineAnesthetics, LocalAcupuncture AnalgesiaFentanylAnalgesicsAnesthesia, EpiduralMeperidineLabor PainPainSufentanilProton Pump InhibitorsInfusion PumpsInjections, SpinalNerve BlockLabor, ObstetricAnesthesia, ObstetricalAmidesIon PumpsAnesthesia, SpinalTramadolDouble-Blind MethodAnalgesics, Non-NarcoticNaloxoneCesarean SectionPostoperative Nausea and VomitingPain ThresholdInterpleural AnalgesiaDrug ToleranceReceptors, Opioid, muInfusion Pumps, ImplantableAnesthesia, GeneralConscious SedationKetorolacLabor Stage, FirstLidocaineHydromorphonePain ManagementAnesthesia, CaudalClonidineAnesthesia and AnalgesiaSodium-Potassium-Exchanging ATPaseKetamineFemoral NervePregnancyReceptors, OpioidPirinitramideHypnotics and SedativesAlfentanilButorphanolNalbuphineNarcotic AntagonistsAnesthetics, CombinedAnesthesia, ConductionThoracotomyOpioid PeptidesElectroacupunctureMepivacaineProspective StudiesPruritusKetoprofenDose-Response Relationship, DrugAdjuvants, AnesthesiaPlacebo EffectOuabainMorphine DerivativesHyperalgesiaAnesthesia, LocalPostoperative CarePeriaqueductal GrayNitrous OxidePain, IntractablePentazocinePiperidinesDexmedetomidineBrachial PlexusAmbulatory Surgical ProceduresHysterectomyOxycodoneAnesthesia, IntravenousPain PerceptionInjections, EpiduralAcetaminophenTime FactorsDrug Administration ScheduleCalcium-Transporting ATPasesAnesthetics, DissociativePrilocaineAnti-Inflammatory Agents, Non-SteroidalNociceptorsDelivery, ObstetricObstetric Labor ComplicationsInjections, Intravenous