Epidural Analgesia Compared with Combined Spinal–Epidural Analgesia during Labor in Nulliparous Women

Abstract
Among nulliparous women, there appears to be an association between the use of epidural analgesia during labor and an increased risk of dystocia. We tested the hypothesis that combined spinal–epidural analgesia, which permits ambulation during labor, is associated with a lower incidence of dystocia than continuous lumbar epidural analgesia.