AnalgesiaAnalgesia, EpiduralAnesthetics, DissociativeAnalgesia, ObstetricalAnalgesia, Patient-ControlledAnalgesics, OpioidPain, PostoperativeAnalgesicsMorphinePain MeasurementBupivacaineAnesthetics, LocalFentanylAcupuncture AnalgesiaAnesthesia, EpiduralPainMeperidineInjections, SpinalSufentanilDouble-Blind MethodLabor PainAnesthetics, CombinedXylazineNerve BlockConscious SedationAnesthesia, ObstetricalLabor, ObstetricAnesthesia, CaudalTramadolAnesthesia, GeneralAmidesAnesthesia, SpinalMidazolamAnalgesics, Non-NarcoticExcitatory Amino Acid AntagonistsAdjuvants, AnesthesiaNaloxonePain ThresholdDrug ToleranceAnesthesia, IntravenousAnestheticsPostoperative Nausea and VomitingCesarean SectionLidocaineDose-Response Relationship, DrugAnesthetics, IntravenousReceptors, Opioid, muPropofolInterpleural AnalgesiaDrug Administration ScheduleInjections, IntravenousAnesthesiaInfusions, IntravenousThiopentalPreanesthetic MedicationInjections, IntramuscularRats, Sprague-DawleyClonidineHydromorphoneTime FactorsKetorolacPain, IntractableAlfentanilPregnancyButorphanolReceptors, OpioidReceptors, N-Methyl-D-AspartateKetamineHyperalgesiaLabor Stage, FirstDexmedetomidineNarcotic AntagonistsProspective StudiesMedetomidineNitrous OxidePain ManagementDrug InteractionsHypnotics and SedativesAnesthesia and AnalgesiaFemoral NerveDepressive Disorder, Treatment-ResistantThoracotomyOpioid PeptidesPiperidinesTreatment OutcomeKetoprofenPentobarbitalPirinitramideStereoisomerismAcepromazineAdministration, OralNalbuphineDrug CombinationsAnesthesia Recovery PeriodAnesthesia, ConductionAdministration, RectalRespirationNefopamAmbulatory Surgical ProceduresElectroacupuncture