From what I have experienced most OBs AROM or pts SROM on their own. If the OB is in house I don't ever remember them not AROMing the patient. I had a pt the other night who walked in complete and intact, was pushing and OB showed up AROM and delivered w/ next push. I don't know if pushing while intact would cause a AI, from what I understand of the physiology is caused by a break in the placental vasculature system allowing fluid to travel into maternal vasculature. That doesn't necessarily happen when pushing. Baby's delivered en cul (sp?) ie the BOW intact, is very rare, and as long as it is ruptured immediately the risk of aspiration is about the same as a c/s birth. I would assume that the pressure of delivery would rupture the sac spontaneously. As a side note is it considered to be good fortune for a baby to be born en cul.