ok, here's some stuff i found:http://www.emedicine.com/med/topic3746.htm:
The initial signs and symptoms of uterine rupture are typically nonspecific, a condition which makes diagnosis difficult and which sometimes delays definitive therapy. From the time of diagnosis to delivery, only 10-37 minutes are available before clinically significant fetal morbidity becomes inevitable. Fetal morbidity invariably occurs because of catastrophic hemorrhage, fetal anoxia, or both. The inconsistent premonitory signs and the short time for instituting therapeutic action make uterine rupture a fearful event.http://www.medscape.com/viewarticle/458963_6:
n a larger study, Leung et al. evaluated 78 cases of uterine rupture in a large tertiary care medical center and reported significant neonatal morbidity when 18 minutes or more elapsed between the onset of prolonged deceleration and birth. When the prolonged deceleration was preceded by severe late or variable decelerations, fetal asphyxia occurred as early as 10 minutes from the onset of prolonged deceleration.
and at the end of this very disturbing article:
Prompt intervention does not always prevent severe, fetal metabolic acidosis or neonatal death. Even in facilities with immediate access to cesarean birth uterine rupture can result in catastrophic outcome. A non-reassuring FHR pattern, occurring prior to the time of uterine rupture, further decreases the amount of time available before fetal insult occurs.
ok i'm stopping. i can't look at these kinds of numbers anymore, or else i'll never VBAC.