It depends. Sometimes women have asymptomatic ruptures that don't require any medical intervention at all and they heal on their own. Sometimes it can be bad enough to have to go in and stitch it up, but after the baby is delivered vaginally. Sometimes the baby will try to get through the rupture instead of the birth canal, requiring a C-section, and then they stitch you up again, just like any other C-section circumstance. Sometimes the baby is completely delivered through the rupture, damaging baby and mom's internal organs, possibly resulting in infant death, hysterectomy, and/or maternal death.
HOWEVER, the slightly increased risk of uterine rupture (0.7-1.5%, depending on where you look) is the ONLY added risk of a VBAC, and that includes ALL instances of rupture, not just the really bad cases resulting in death. And rupture can occur in a first-time vaginal birth with no history if uterine surgery.
at 1:13 PM on Dec. 7, 2010