New research linking epidural anaesthesia during childbirth to reduced risk for postpartum depression suggests that pain control during labor and delivery may lower women’s risk of developing the serious mood disorder.
To examine the relationship between pain during labor and postpartum depression, Ting Ding, MD, from the Department of Anesthesiology and the Department of Surgical Intensive Care, Peking University First Hospital, Beijing, China, and colleagues enrolled a cohort of women preparing for a vaginal delivery in a prospective, observational study from May 1 to August 10, 2009.
Of the 214 study participants included in the final data analysis, 107 requested and received epidural labor analgesia.
At 6 weeks postpartum, 14.0% of the women who had opted for epidural anaesthesia during delivery had depressive symptoms compared with 34.6% of the women who did not choose epidural anesthesia, the authors report in an article published in the August issue of Anesthesia & Analgesia.
Although causal connections cannot be drawn from observational studies, the confirmation of a relationship between pain during labor and postpartum depression warrants further investigation, the authors write. The potential link is particularly important in light of the extensive evidence that postpartum depression can have serious adverse effects on new mothers, their infants, and their families.
For the current investigation, the researchers collected baseline data, including demographic variables, medical and present pregnancy history, and smoking and alcohol use, as well as relevant antenatal, perinatal, and postpartum variables such as childbirth education, duration of labor, pain scores, and breast-feeding status.
All participants underwent mental health assessment using the Edinburgh Postnatal Depression Scale (EPDS) at 3 days and 6 weeks postpartum, and a score of 10 or higher at 6 weeks was the cut-off for clinically significant postpartum depression.
Of the full cohort, 52 women, including 15 women in the epidural group and 37 in the no-epidural group, were diagnosed with postpartum depression based on their EPDS scores at 6 weeks, the authors report. They note a significant correlation between the EPDS scores at 3 days and those at 6 weeks. Attendance at childbirth classes during pregnancy and continued breast-feeding after delivery were also associated with decreased risk for postpartum depression, they write.
In multivariate logistic regression analyses, epidural analgesia during labor was significantly associated with a decreased risk for depression at 6 weeks and remained predictive with the exclusion of EPDS score at 3 days postpartum and breast-feeding at 6 weeks postpartum, the authors write.
On the basis of the findings, as well as the significant body of literature linking pain and depression, “Further study with a large sample size is clearly needed to evaluate the impact of epidural analgesia on the occurrence of postpartum depression,” the authors conclude.
In an accompanying editorial Katherine Wisner, MD, from the Asher Center for the Study and Treatment of Depressive Disorders, Department of Psychiatry, Northwestern University, Chicago, Illinois, and colleagues note that the study is one of the few that examines the relationship between pain during labor and postpartum depression.
“It’s a huge omission that there has been almost nothing in postpartum depression research about pain during labor and delivery and postpartum depression,” Dr. Wisner notes in a news release. “Pain control gets the mother off to a good beginning rather than starting off defeated and exhausted,” she continued.
“Whether it’s vaginal or cesarean section delivery, pain control postpartum is an issue for all new mothers. There is no way to have a delivery without pain. The objective here is to avoid severe pain. Controlling that delivery pain so a woman can comfortably develop as a mother is something that makes a lot of sense,” she adds.
“These findings are quite exciting and further research should be done to confirm them, especially in women at increased risk of postpartum depression and in women from other cultures,” Dr. Wisner concludes.