AnalgesiaPreoperative CareAnalgesia, EpiduralAnalgesia, ObstetricalAnalgesia, Patient-ControlledPreoperative PeriodAnalgesics, OpioidPain, PostoperativePain MeasurementMorphineBupivacaineAnesthetics, LocalAcupuncture AnalgesiaFentanylAnalgesicsAnesthesia, EpiduralMeperidinePainSufentanilLabor PainTreatment OutcomePostoperative ComplicationsNerve BlockInjections, SpinalRetrospective StudiesAnesthesia, ObstetricalLabor, ObstetricProspective StudiesPostoperative PeriodPostoperative CareDouble-Blind MethodAnesthesia, SpinalAmidesTramadolAnalgesics, Non-NarcoticAnesthesia, GeneralPostoperative Nausea and VomitingCesarean SectionPain ThresholdNaloxoneRectal NeoplasmsTime FactorsInterpleural AnalgesiaConscious SedationFollow-Up StudiesIntraoperative CareKetorolacDrug ToleranceReceptors, Opioid, muThoracotomyPerioperative CareLidocainePain ManagementLabor Stage, FirstIntraoperative PeriodHydromorphoneClonidineFemoral NerveAmbulatory Surgical ProceduresAnesthesia, CaudalKetamineTomography, X-Ray ComputedAnesthesia and AnalgesiaAnesthesia, ConductionPregnancyHypnotics and SedativesReceptors, OpioidPredictive Value of TestsAlfentanilPremedicationPirinitramideNeoadjuvant TherapyHysterectomySurgical Procedures, OperativeButorphanolAnesthesia, LocalKetoprofenNalbuphineArthroplasty, Replacement, KneeNarcotic AntagonistsSurgical Procedures, ElectiveAnesthetics, CombinedPreanesthetic MedicationIntraoperative ComplicationsAnesthesiaOpioid PeptidesElectroacupunctureOrthopedic ProceduresMepivacainePruritusCardiac Surgical ProceduresNeoplasm StagingPrognosisNitrous OxideCombined Modality TherapyHyperalgesiaPatient SatisfactionAdjuvants, AnesthesiaPlacebo EffectLength of Stay