The most rare yet most serious risk of vaginal birth after cesarean (VBAC) is that the scar on the uterus may break open (rupture) during labor. Women who have a low transverse cesarean scar have a lower risk of rupturing than women who have a vertical incision scar. About 5 to 9 out of 1,000 women (0.5% to 0.9%) with a low transverse scar have a uterine rupture during a trial of labor.1
A woman's risk of uterine rupture increases with:
It is likely that the women who have a rupture have other risk factors, which are things that make them more likely to have this complication.
Having had a vaginal delivery during another pregnancy lowers the risk of uterine rupture during VBAC. Women who have delivered vaginally and later had a cesarean delivery have about one-fourth the risk of women who have had a cesarean delivery but no vaginal delivery.1
In the rare event that a uterine scar ruptures, it can be dangerous to both the mother and her infant.
Depending on severity, a rupture can:
|Primary Medical Reviewer||Sarah Marshall, MD - Family Medicine|
|Specialist Medical Reviewer||Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology|
|Last Revised||March 28, 2011|
Last Revised: March 28, 2011
Author: Healthwise Staff
To learn more visit Healthwise.org
© 1995-2013 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.