Anesthesia, SpinalCesarean SectionAnesthesia, ObstetricalBupivacaineAnesthesia, GeneralAnesthetics, LocalSpinal CordAnesthesia, EpiduralAnesthesiaEphedrinePregnancyAnesthesia, LocalAnesthesia, ConductionDelivery, ObstetricCesarean Section, RepeatTrial of LaborAnesthesia Recovery PeriodAdjuvants, AnesthesiaHypotensionVaginal Birth after CesareanSpinal Cord InjuriesInjections, SpinalLidocaineAnesthesia, InhalationAnesthesia, IntravenousTetracaineLabor, InducedSpecific GravityObstetric Labor ComplicationsPregnancy OutcomeFentanylMepivacaineAnalgesia, ObstetricalNerve BlockPain, PostoperativeApgar ScoreUterine RuptureLabor Stage, FirstAmbulatory Surgical ProceduresAnesthetics, CombinedSurgical Procedures, ElectiveMonitoring, IntraoperativePrilocaineProspective StudiesBreech PresentationDouble-Blind MethodPostoperative Nausea and VomitingSurgical Procedures, MinorSensationIntraoperative ComplicationsAnesthetics, IntravenousInfant, NewbornDrug Delivery SystemsAnalgesics, OpioidPropofolAnesthesia, DentalEndometritisPost-Dural Puncture HeadacheSufentanilCarticaineIsotonic SolutionsSpinal PunctureShiveringSpinal Nerve RootsPain MeasurementAmidesAnesthetics, InhalationOxytocicsAnalgesia, EpiduralPuerperal InfectionParityHernia, InguinalPlasma SubstitutesConscious SedationFemoral NerveAnestheticsHydroxyethyl Starch DerivativesTime FactorsPreanesthetic MedicationPhenylephrineMorphineSpinal NervesGestational AgeTerm BirthIsofluraneSpinal Cord DiseasesPregnancy ComplicationsLabor, ObstetricMethyl EthersAnesthesiologyNeedlesHemodynamicsLabor PainEtilefrinePelvimetryPostoperative ComplicationsLabor PresentationPregnancy Complications, CardiovascularSubarachnoid SpaceRetrospective Studies