BupivacaineAnesthetics, LocalAnalgesia, EpiduralAnesthesia, SpinalAnalgesia, ObstetricalAnesthesia, EpiduralAmidesAnesthesia, ObstetricalAnalgesics, OpioidPain, PostoperativeNerve BlockLidocaineSufentanilAnesthesia, CaudalAnesthetics, CombinedAdjuvants, AnesthesiaDouble-Blind MethodEtidocaineAnesthesia, LocalInjections, SpinalFentanylCesarean SectionPain MeasurementMepivacaineAnalgesiaCarticaineAnalgesia, Patient-ControlledMorphinePreanesthetic MedicationAnesthetics, IntravenousStereoisomerismAnesthesia, GeneralDose-Response Relationship, DrugAnesthesia Recovery PeriodSubarachnoid SpaceSensationAmbulatory Surgical ProceduresLabor, ObstetricInjections, EpiduralBrachial PlexusPregnancyMeperidinePrilocaineThoracotomyProcaineClonidineTramadolEpinephrinePostoperative Nausea and VomitingDrug CombinationsHemodynamicsProspective StudiesPropofolSpecific GravityDexmedetomidineSciatic NerveMidazolamAnesthesia, Intravenous