Analysis of high risk factors and causes of 1707 cases postpartum hemorrhage

Objective To explore the risk factors and the causes of postpartum hemorrhage.Methods All 1707 cases of postpartum hemorrhage in 5 hospitals in Jiangsu Province from 1999 to 2008 were collected and retrospectively an alyzed.Risk factors of postpartum hemorrhage,bleeding reasons and blood loss amount were estimated.Results ①The percent of history of abortion,hypertensive disorder complicating pregnancy and placental abruption of postpartum hemorrhage were 55.1%,17.9% and 15.9% respectively.The blood loss of pregnant women with high risk factors [(782.3±683.3) mL] were significantly higher than those without high risk factors [(571.0 ±225.7) mL](P 0.05).②There were statistical differences in blood loss between cesarean section [(836.2 ±763.2) mL] and vaginal delivery [(634.1± 377.1) mL](P 0.05).③ Uterine atony,placenta factor,obstetric trauma and coagulation defects were the 4 main causes of the 1707 cases postpartum hemorrhage.There was no statistical significance of postpartum haemorrhage amount differences between uterine atony and obstetric trauma groups.There was significant differences in blood loss between placenta factor group and blood coagulation dysfunction group.④Most postpartum hemorrhage(86.0%,1468/ 1707) were occurred in 2 hours.Conclusion ①The blood loss of pregnant women with high risk factors is significantly higher that of pregnant women with no high risk factors.② The blood loss of cesarean section patients is more than that of vaginal delivery patients.③Uterine atony is still the main cause of postpartum hemorrhage.The blood loss of postpartum hemorrhage caused by placental factors and coagulation defects are significantly higher than those of uter ine atony and obstetric trauma.