Background Each year in the United States, approximately 60percent of women with a prior cesarean delivery who become pregnantagain attempt labor. Concern persists that a trial of labormay increase the risk of uterine rupture, an uncommon but seriousobstetrical complication.
Methods We conducted a population-based, retrospective cohortanalysis using data from all primiparous women who gave birthto live singleton infants by cesarean section in civilian hospitalsin Washington State from 1987 through 1996 and who delivereda second singleton child during the same period (a total of20,095 women). We assessed the risk of uterine rupture for deliverieswith spontaneous onset of labor, those with labor induced byprostaglandins, and those in which labor was induced by othermeans; these three groups of deliveries were compared with repeatedcesarean delivery without labor.
Results Uterine rupture occurred at a rate of 1.6 per 1000 amongwomen with repeated cesarean delivery without labor (11 women),5.2 per 1000 among women with spontaneous onset of labor (56women), 7.7 per 1000 among women whose labor was induced withoutprostaglandins (15 women), and 24.5 per 1000 among women withprostaglandin-induced labor (9 women). As compared with therisk in women with repeated cesarean delivery without labor,uterine rupture was more likely among women with spontaneousonset of labor (relative risk, 3.3; 95 percent confidence interval,1.8 to 6.0), induction of labor without prostaglandins (relativerisk, 4.9; 95 percent confidence interval, 2.4 to 9.7), andinduction with prostaglandins (relative risk, 15.6; 95 percentconfidence interval, 8.1 to 30.0).
Conclusions For women with one prior cesarean delivery, therisk of uterine rupture is higher among those whose labor isinduced than among those with repeated cesarean delivery withoutlabor. Labor induced with a prostaglandin confers the highestrisk.
Source Information
From the Center for Women's Health Research, Department of Family and Child Nursing, School of Nursing (M.L.-R.), the Department of Epidemiology, School of Public Health and Community Medicine (V.L.H.), the Department of Obstetrics and Gynecology, School of Medicine (T.R.E.), and the Department of Health Services, School of Public Health and Community Medicine (M.L.-R., D.P.M.), University of Washington, Seattle.
Address reprint requests to Dr. Lydon-Rochelle at the Center for Women's Health Research, Mailstop 357262, University of Washington, Seattle, WA 98195-7262, or at minot{at}u.washington.edu.
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