Does the timing of neuraxial analgesia initiation in elective induction of multiparous women prolong the duration of delivery?

To investigate whether the early initiation of neuraxial analgesia prolongs the duration of electively induced labor in Japanese multiparous women.This retrospective study included multiparous term women who underwent elective induction of labor using combined spinal-epidural analgesia at the Showa University Hospital between October 2018 and March 2021. The participants were divided into two groups: early and late. If neuraxial analgesia was initiated when the cervical dilation was ≤3 cm, the patient was included in the early group. The remaining patients were included in the late group. The obstetric and neonatal outcomes were compared between the two groups. The primary outcome was the duration of delivery. The secondary outcomes were the rates of instrumental and cesarean deliveries.Two hundred and ninety-seven women (early group = 139, late group = 158) were included in the analysis. The duration of the first stage of labor did not differ significantly between the early and late groups (median: 232 vs. 260 min, p = 0.35). Similarly, there was no significant difference in the duration of the second stage (37 vs. 40 min, p = 0.20). Moreover, the rates of instrumental and cesarean deliveries did not differ significantly between the groups, and the neonatal outcomes were comparable.Early initiation of neuraxial analgesia in the elective induction of parous Japanese women did not prolong the duration of delivery. Our results suggest that neuraxial analgesia may be initiated whenever a parturient desires it.