Biologic changes after delivery may prevent development of chronic pain

Published on December 19, 2012 at 2:43 PM · No Comments

Chronic pain from childbirth is remarkably rare, according to a study from the January issue of Anesthesiology. Additionally, in a second study, researchers at Wake Forest School of Medicine, Winston-Salem, N.C., found the biologic changes after delivery may prevent the development of pain.

Childbirth is often associated with physical injury. Whether women deliver vaginally or through cesarean section, many experience unavoidable physical injury and may be at risk for the development of chronic pain. Researchers wanted to determine whether childbirth represents a major cause of chronic pain in women.

In the first study, 1,228 women were interviewed within 36 hours of delivery. Of these women, 76 percent successfully completed a telephone interview at two months, and, if they had pain, at six and 12 months after delivery.

Pain that began at the time of delivery was remarkably rare six and 12 months later. Only 1.8% of the women who had pain that began at the time of delivery had pain 6 months later and only 0.3% of women with pain beginning at the time of delivery had pain at 12 months.

"The study suggests there may be a protecting mechanism that is active around the time of childbirth to prevent chronic pain from physical injury," said James C. Eisenach, M.D., Professor, Anesthesiology-Obstetric and Gynecologic Anesthesia, Wake Forest Baptist Medical Center. "In our accompanying lab study, we analyzed the sources of this natural protection in hopes we may be able to develop treatments to prevent chronic pain from happening after other types of trauma or surgery, similar to vaccines to prevent infectious diseases."

In the second study, preliminary research in rats was conducted to assess a possible mechanism for a low incidence of chronic pain after childbirth. The effect of pregnancy and delivery on hypersensitivity induced by peripheral nerve injury (spinal nerve ligation (SNL)) to mechanical stimuli was investigated. The effects of spinal injection of atosiban (an antagonist of oxytocin, a hormone that is important during and after childbirth) and naloxone (an opioid receptor blocker) were also examined, as well as oxytocin concentration in lumbar cerebrospinal fluid.

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