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Abstract Objective: To investigate the application of placenta accreta score by ultrasound for evaluating the patients with dangerous placenta previa before operation. Methods: The data of 118 women with dangerous placenta previa were retrospectively analyzed. According to placenta accreta score by ultrasound, the included patients were divided into group A (≤ 5 points), group B (6-10 points), and group C (≥10 points). The volume of intraoperative bleeding and blood transfusion, hysterectomy rate, and hospitalization days, and rate of maternal and infant complication of patients in the three groups were analyzed. Results: There were significant difference in gestational weeks, number of delivery, and number of cesarean section of patients among the three groups (P<0.05), but there were no significant difference in age, number of pregnancy, number of abortion, the rate of emergency operation, newborn weight, and the time interval from the last cesarean section of patients among the three groups (P>0.05). The volume of intraoperative blood loss and intraoperative blood transfusion, the rate of postoperative complication, and operative duration of patients, and number of patients who received hysterectomy, the number of neonatal asphyxia in group C were the highest among the three groups, and the days of hospitalization of patients in group C was also longest (P<0.05). The placenta accreta score was positively correlated with volume of intraoperative blood loss (r=0.77, P<0.05). Conclusion: The preoperative ultrasound placenta accreta score can predict the risk of postpartum hemorrhage. The measures should be conducted for patients with dangerous placenta previa based on individualize evaluation, which can reduce postpartum hemorrhage and perinatal complications, and improve the maternal and infant outcomes.
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