the one uterine rupture i knew the stats on was a g3/p2, attempting second vbac (first vbac successful). she came in and got an epidural, which slowed her contractions, so then pitocin augmentation was given. when it came time to push, she wasn't pushing effectively.
the doc had forcepts sitting right on his table, but didn't like to use them. he ordered fundal pressure instead. the mother indicated it hurt (through the epidural - that was so strong she couldn't push - hellooo!). they let her try again. fundal pressure was ordered again. her uterus ruptured.
i caught the baby after a stat section. i truly thought i'd been handed a dead baby. apgars something like 1:4:7. didn't even try to gasp until nearly 10 minutes old. the baby went to level ii, but was off the vent later that afternoon. went home doing well - big term 8-pounder as i recall.
the ob spent hours sewing mom's uterus back together, only to tell her not to get pregnant again.
some places don't allow pitocin for vbacs, some don't even allow epidurals. i have mixed feelings about vbacs. but the problem isn't really the vbacs. the problem is not preventing the original c-section in the first place.
if i had a dollar for every woman who vbaced a bigger baby the the c-section baby she was 'too small to deliver', i'd be a rich woman and wouldn't have to work.