AnalgesiaNauseaAnalgesia, EpiduralAnalgesia, ObstetricalAnalgesia, Patient-ControlledPostoperative Nausea and VomitingAnalgesics, OpioidPain, PostoperativeVomitingAntiemeticsMorphinePain MeasurementBupivacaineAnesthetics, LocalFentanylAcupuncture AnalgesiaAnalgesicsAnesthesia, EpiduralMeperidineSufentanilPainOndansetronDouble-Blind MethodLabor PainInjections, SpinalNerve BlockAnesthesia, ObstetricalAnesthesia, SpinalLabor, ObstetricAmidesAnesthesia, GeneralAnalgesics, Non-NarcoticDroperidolCesarean SectionTramadolMotion SicknessNaloxoneDrug Administration ScheduleVomiting, AnticipatoryDrug TolerancePain ThresholdInterpleural AnalgesiaKetorolacAcupressureMorning SicknessGranisetronHydromorphoneConscious SedationReceptors, Opioid, muProchlorperazinePain ManagementPregnancyLidocaineInfusions, IntravenousProspective StudiesLabor Stage, FirstTreatment OutcomeAlfentanilMetoclopramideDose-Response Relationship, DrugClonidineKetaminePruritusAnesthesia, ConductionFemoral NerveAnesthesia, CaudalPirinitramideAnesthesia and AnalgesiaHypnotics and SedativesNitrous OxideAnesthetics, CombinedSerotonin 5-HT3 Receptor AntagonistsHyperemesis GravidarumNalbuphineReceptors, OpioidAdjuvants, AnesthesiaElectroacupunctureNarcotic AntagonistsPiperidinesButorphanolPlacebo EffectKetoprofenThoracotomyInjections, IntravenousGynecologic Surgical ProceduresOpioid PeptidesAnesthesia, IntravenousAnesthesia, LocalOxycodonePostoperative CareAcupuncture PointsHysterectomyMepivacaineMorphine DerivativesPreanesthetic MedicationAnesthesia Recovery PeriodHyperalgesiaNeostigminePain, IntractableAcetaminophen