For women with a previous cesarean delivery, successful VBAC
deliveries were generally associated with lower morbidity than scheduled
repeat procedures (with the exception of ruptured uterus, which
was not significantly different). However, failed trials of labor were
associated with increased rates for three of the morbidities compared
with scheduled repeat procedures, which is consistent with many other
studies (24–27) and especially true for ruptured uterus. Attempting a
trial of labor with the current delivery after a previous cesarean delivery
is a consistent predictor of ruptured uterus (15,27,28), although this
morbidity is still very rare.