[The influence of the intrapartum inventions on the maternal and neonatal outcomes of vaginal birth after cesarean].

Objective: To investigate the maternal and neonatal outcomes after different intrapartum interventions for vaginal birth after cesarean (Vaginal Birth After Cesarean-section, VBAC). Methods: One hundred and forty three cases in Beijing Obstetrics & Gynecology Hospital, Capital Medical University from January 2015 to November 2016 were selected retrospectively.The relationship between the intrapartum inventions such as induction style, oxytocin usage and spinal analgesia and the maternal and neonatal outcomes such as delivery way, labor time, postpartum hemorrhage and fetal distress were analyzed in pregnant women underwent VBAC. Results: (1) Maternal and neonatal outcomes: No maternal and newborn deaths occurred in the 143 cases of VBAC.One hundred and thirteen cases underwent vaginal delivery (79.0%) and 30 cases underwent operative vaginal delivery (21.0%). Twenty-four cases (16.8%) occurred postpartum hemorrhage, 32 cases (24.3%) fetal distress, and 2 (1.4%) asphyxia.(2) Intrapartum inventions: 123 cases (86.0%) were spontaneous onset of labor and 20 cases (14.0%) induction of labor.41 cases (30.6%) used oxytocin during labor to strengthen contractions, 37 cases (25.9%) underwent spinal analgesia.The operative vaginal delivery rate in the induction labor group was significantly higher than that in natural labor group (P<0.05). The duration of the first stage, second stage and total labor in the group using oxytocin were significantly longer than those in the group not using oxytocin (P<0.05). The rate of operative vaginal delivery in the group using oxytocin was significantly higher than that in the group not using oxytocin (P<0.05). The duration of the first stage, second stage and total labor in analgesia group were significantly longer than those in the group not using analgesia (P<0.05). The incidence of postpartum hemorrhage and operative vaginal delivery in analgesia group was significantly higher than those in the group not using analgesia (P<0.05). Conclusion: Oxytocin may increase the rate of vaginal delivery in VBAC.Spinal analgesia and oxytocin may prolong the labor time and increase the incidence of postpartum hemorrhage in VBAC.