Programmed Intermittent Epidural Bolus Versus Continuous Infusion in Labour Analgesia

Inclusion Criteria: * Pregnant nulliparous or multiparous woman in labour * Age ≥18 years * Obtained consent for epidural analgesia * ASA classification I-II-III * Early labour (cervical dilation ≤6cm) Exclusion Criteria: * Pregnancy-related comorbidities (preeclampsia, eclampsia, gestational diabetes, large for gestational age fetus) * Prematurity (\<36 weeks of gestation) * Multiple gestation * Fentanyl allergy or hypersensitivity * Patient unable to understand the PCEA * Fetal breech position * Maternal cardiac pathology and contraindication to Valsalva manoeuvre * Patient with a pain visual analog scale (VAS) not ≤1/10 20 minutes after the anesthesiologist's initial bolus * Intrathecal catheter or intravascular catheter * Accidental dural puncture * Patient refusal * Patient with a history of chronic pain (pain lasting more than 3 months) or fibromyalgia