Abstract: Objective：To analyze the clinical feature and treatment of dangerous placenta previa. Methods：The clinical data of 9 640 people who delivered in our hospital in July 2012—June 2014 were reviewed retrospectively, including 1 284 cases with once or more history of cesarean section, accounted for 1.3% （128/9 640） of the delivery of pregnant women at the same period. 128 cases of placenta previa, accounted for 2.6% （34/1 284） of the scar uterus pregnant women at the same period. Including 94 cases （73.4%） of ordinary placenta previa and 34 cases （26.6%） of dangerous placenta previa. Results：The incidence of dangerous placenta previa complicated by placenta accreta was significantly higher than that of common placenta previa group （χ2=11.04, P=0.00）. The duration of operation, amount of bleeding in or after operation and the amount of blood transfusion were higher than the common placenta previa group （P＜0.05）. There were no significant difference in the Hb value before operation （P＞0.05）, but the amended Hb value in dangerous placenta previa group was lower than the ordinary placenta previa group after operation （P＜0.05）. Conclusions：The rate of dangerous placenta previa complicated by placenta accreta was high, the operation was difficult, liable to accur severe intrapartum and postpartum hemorrhage, so it was dangerous to mother and perinatal fetus. Elective surgery with full preparation and by experienced obstetrician is the key to successful treatment. Strictly for the first time cesarean section pointer, in order to reduce the incidence of dangerous placenta previa.

Key words: Placenta previa, Cesarean section, Postpartum hemorrhage, Scarred uterus