Intrapartum synthetic oxytocin linked to lower breastfeeding post-vaginal delivery, higher distress post-C-section.

Synthetic oxytocin is widely used for labor induction and augmentation, mimicking the natural hormone crucial for uterine contractions and milk ejection. While essential for managing labor, its exogenous administration can impact the delicate physiological balance of the postpartum period. Concerns exist regarding potential associations with maternal outcomes beyond labor, including breastfeeding initiation and postpartum mental health. Understanding these associations is critical, as complications like postpartum depression and traumatic stress significantly affect maternal and infant well-being, and current interventions often fall short in prevention.

Researchers conducted a prospective cohort study involving 1,296 postpartum women who delivered at a single tertiary care center. Participants were assessed from the third trimester through approximately two months postpartum. Intrapartum synthetic oxytocin exposure, including its use for labor induction or augmentation, was meticulously extracted from electronic medical records. The primary outcomes evaluated were exclusive breastfeeding rates, symptoms of postpartum depression, and childbirth-related traumatic stress. Analyses were rigorously stratified by delivery mode (vaginal vs. unscheduled cesarean) and adjusted for key maternal and obstetric covariates to control for confounding factors.

Overall, a significant proportion of participants, 63.3%, received intrapartum synthetic oxytocin. Among women who had a vaginal delivery, oxytocin exposure was significantly associated with lower exclusive breastfeeding rates at two months postpartum. Specifically, 58.2% of the oxytocin-exposed group exclusively breastfed compared to 70.3% in the unexposed group, yielding an adjusted relative risk (RR) of 0.86 (95% CI 0.76-0.97; p = 0.02). However, for vaginal deliveries, oxytocin exposure showed no association with postpartum mental health outcomes.

Among participants undergoing unscheduled cesarean delivery, intrapartum oxytocin exposure was independently linked to several adverse mental health outcomes: higher immediate postpartum depressive symptoms (F = 4.97, p = 0.03), increased acute childbirth-related stress (F = 4.56, p = 0.03), and elevated two-month childbirth-related posttraumatic stress symptoms (F = 4.30, p = 0.04). No association was found with two-month depressive symptoms in this group.