AnalgesiaAnalgesia, EpiduralAnalgesia, ObstetricalAnalgesia, Patient-ControlledAnalgesics, OpioidPain, PostoperativeMorphinePain MeasurementBupivacaineAnesthetics, LocalFentanylAcupuncture AnalgesiaAnalgesicsAnesthesia, EpiduralMeperidineSufentanilLabor PainPainNerve BlockInjections, SpinalAnesthesia, ObstetricalLabor, ObstetricDouble-Blind MethodAnesthesia, SpinalAmidesTramadolAnalgesics, Non-NarcoticNaloxoneCesarean SectionPostoperative Nausea and VomitingInjections, IntravenousPain ThresholdInterpleural AnalgesiaAnesthesia, GeneralDrug ToleranceConscious SedationReceptors, Opioid, muKetorolacDorsomedial Hypothalamic NucleusLabor Stage, FirstHydromorphoneClonidineKetaminePain ManagementAnesthesia, CaudalPirinitramideAlfentanilFemoral NerveAnesthesia and AnalgesiaPregnancyHypnotics and SedativesReceptors, OpioidDose-Response Relationship, DrugAnesthetics, CombinedNarcotic AntagonistsButorphanolAnesthesia, ConductionNalbuphineDrug Administration ScheduleProspective StudiesThoracotomyEnterococcus faeciumOpioid PeptidesAdjuvants, AnesthesiaElectroacupunctureMorphine DerivativesPruritusDiet, ReducingNitrous OxideAnesthesia, IntravenousPlacebo EffectPiperidinesHyperalgesiaAnesthesia, LocalPostoperative CarePeriaqueductal GrayInfusion PumpsAmbulatory Surgical ProceduresDexmedetomidinePentazocineBrachial PlexusHysterectomyTime FactorsAnesthetics, DissociativeInfusions, ParenteralPain, IntractableInjections, EpiduralOxycodoneAcetaminophenPain PerceptionAnesthetics, IntravenousTreatment OutcomeNeostigminePropofolDeglutitionPrilocaineNociceptorsRats, Sprague-DawleyDelivery, ObstetricObstetric Labor Complications