| Summary: | Objective: Recently, Bakri balloon (BBT) was effective for women with placenta previa to reduce hemorrhage. However, about 10% of women needed to receive an invasive strategy. Thus, the identification of risk factors and the development of additional measurements for BBT failure was needed. The aim of our study is to investigate the cause and measurements of failing prophylactic BBT in women with placenta previa. Materials and methods: Women with placenta previa who underwent cesarean section and had a prophylactic BBT inserted during the operation at our institution between January 2015 and December 2017 were enrolled. Patients requiring additional procedures after cesarean section for massive hemorrhage were defined as BBT failures. Additionally, the patterns and risk factors of BBT failure were retrospectively evaluated. Results: Seventy women met the inclusion criteria. Of them, 9 (13%) were in the balloon failure group and 61 (87%), in the balloon success group. Between two groups, the median of postoperative blood loss was 1153 g vs. 70 g (p < 0.01) and the total blood loss 2409 g vs. 971 g (p < 0.01). There were two types of failures in the balloon failure group: balloon prolapse in eight patients (89%) and accidental placental retention in one patient (11%). The hemorrhage was controlled in all patients with balloon prolapse by reinsertion and inflation of the balloon. The patient with placental retention required a uterine artery embolization (UAE). Although three patients required a blood transfusion, none required a hysterectomy. The logistic regression for the risk of balloon failure revealed classification of major previa to be the highest risk factor (Hazard Ratio; 19.1, 95% Confidence Interval; 3.17–367.9, p < 0.01). Conclusion: The major cause of BBT failure was balloon prolapse. It could be treated with non-invasive methods; however, patients with placental retention could not avoid invasive treatment to stop the hemorrhage. Keywords: Bakri balloon, Cesarean section, Placenta previa, Postpartum hemorrhage, Uterine atony
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