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2001 SEP 6 - (NewsRx Network) -- Contrary to what has previously been reported, epidural analgesia, used to relieve women's pain during labor, does not appear to increase a woman's chances of having a cesarean section, according to an analysis of hospital records by researchers at the U.S. National Institute of Child Health and Human Development (NICHD) and Tripler Army Medical Center in Hawaii.
The researchers also found that epidural analgesia, or pain relief, does not increase the chances for difficult birth, as many had feared, but does prolong labor by an average of 25 minutes. The findings were reported recently in the American Journal of Obstetrics and Gynecology.
More than 50% of pregnant women in the U.S. receive epidural analgesia to relieve the pain of labor, said the study's principal investigator, Dr. Jun (Jim) Zhang, PhD, MD, of NICHD's Division of Epidemiology, Statistics and Prevention Research. The procedure involves using a needle to inject a pain reliever into a space next to the spinal cord in the lower back. Many obstetricians have been concerned that the procedure may also slow down labor and thus increase the chances that a woman in labor may need a cesarean section.
The researchers began by examining the labor records from the Tripler Army Medical Center. In late 1993, the U.S. Department of Defense required that epidural analgesia be made available to women in labor at military medical centers. As a result, the rate at which first time mothers received epidural analgesia at the medical center increased from 1% to 84%. During that time, there were no major staffing changes at the hospital and no change in delivery procedures.
"This unique natural experiment offers an ideal opportunity to study the impact of epidural analgesia on the course of labor and delivery," the researchers wrote.
For the study, they analyzed the records of two groups of first-time mothers: those who gave birth in the 12 months before October 1, 1993, designated the "before period" and those who gave birth in the 12 months after October 1, 1995, the "after" group. In all, there were 507 women in the "before" group and 581 women in the "after" group.
The researchers found that ...