AnalgesiaAnalgesia, EpiduralAnalgesia, ObstetricalAnalgesia, Patient-ControlledAnalgesics, OpioidPain, PostoperativeMorphinePain MeasurementBupivacaineAnesthetics, LocalAcupuncture AnalgesiaFentanylAnalgesicsAnesthesia, EpiduralMeperidinePainSufentanilLabor PainInjections, SpinalNerve BlockDouble-Blind MethodLabor, ObstetricAnesthesia, ObstetricalAmidesAnesthesia, SpinalTramadolAnalgesics, Non-NarcoticNaloxoneCesarean SectionDrug TolerancePain ThresholdPostoperative Nausea and VomitingInterpleural AnalgesiaReceptors, Opioid, muConscious SedationAnesthesia, GeneralHydromorphoneKetorolacLidocaineDrug Administration ScheduleLabor Stage, FirstClonidineKetaminePregnancyPain ManagementAnesthesia, CaudalHypnotics and SedativesAnesthesia and AnalgesiaReceptors, OpioidFemoral NerveNarcotic AntagonistsInjections, IntravenousAlfentanilPirinitramideButorphanolNalbuphineProspective StudiesTime FactorsAnesthetics, CombinedAnesthesia, ConductionOpioid PeptidesTreatment OutcomeInfusions, IntravenousKetoprofenThoracotomyAdjuvants, AnesthesiaElectroacupunctureMepivacainePruritusMorphine DerivativesPlacebo EffectPiperidinesAdministration, OralNitrous OxideHyperalgesiaAnesthesia, LocalRats, Sprague-DawleyPentazocinePeriaqueductal GrayPostoperative CareAcetaminophenDexmedetomidineRadiation DosageLethal Dose 50OxycodonePain, IntractableAmbulatory Surgical ProceduresHysterectomyAnti-Inflammatory Agents, Non-SteroidalAnesthesia, IntravenousBrachial PlexusDose-Response Relationship, DrugInjections, IntramuscularAnesthetics, DissociativeInjections, EpiduralPain PerceptionNociceptorsDrug CombinationsNeostigmineNarcotics