When the amniotic sac<unk> s, production of prostaglandins increases and the cushioning between the fetus and uterus is decreased, both of which are processes that increase the frequency and intensity of contractions. On occasion, with the<unk> , particularly if the head is not engaged, the umbilical cord may prolapse. A cord prolapse is an obstetrical emergency, as the descending head may block fetal-placental circulation. Once the<unk>  are<unk> d, bacteria may ascend and could lead to amnionitis and fetal infection. A premature<unk>  can have multiple effects on the fetus such as increasing his/her risk of prematurity and facing neonatal or perinatal complications.
Rupture of membranes
Artificial rupture of membranes
Placental expulsion
Pneumonolysis
Placental infarction
Uterine inversion
Amniotic fluid embolism
Uterine perforation