Although the patient is at risk for uterine dehiscence/uterine rupture because of her history of a prior Cesarean delivery, these are infrequent occurrences so the most likely cause of postpartum hemorrhage in this patient is uterine atony. Background: Precipitate labour is a vaginal delivery which occurs within 3 hours after onset of labour, there is limited data available on risk factors associated with precipitate labour. The most common etiology of uterine inversion, however, is excessive (iatrogenic) traction on the umbilical cord during the third stage of delivery. Grand multiparity, multiple gestation, polyhydramnios and macrosomia are all risk factors. Factors that lead to an over-distended uterus are risk factors for uterine inversion. Patients at risk for genital tract lacerations are those who have a precipitous labor, macrosomia or who have an instrument-assisted delivery or manipulative delivery (i.e. However, the procedure itself may precipitate premature labour. Risk factors for uterine atony include precipitous labor, multiparity, general anesthesia, oxytocin use in labor, prolonged labor, macrosomia, hydramnios, twins and chorioamnionitis. The course of delivery at twins is often accompanied by significant complications. C Uterine atony is the most common cause of postpartum hemorrhage.
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