The Effect of Prophylactic Balloon Occlusion in Patients with Placenta Accreta Spectrum: a Bayesian Network Meta-Analysis

Placenta accreta spectrum (PAS) can induce severe life-threatening obstetric hemorrhage. Herein, we conducted a Bayesian network meta-analysis of previous studies to evaluate the relative benefits of different prophylactic balloon occlusion (PBO) procedures. PubMed, Embase, Cochrane Library, and Web of Science were searched from inception to July 2021. Blood loss volume, blood transfusion volume, and hysterectomy rate were regarded as the primary endpoints. The data were pooled using a Bayesian network and traditional pairwise meta-analysis. Fifty-nine articles with a total sample size of 5150 patients were included. Compared with no PBO (non-PBO) intervention, PBO of the abdominal aorta (PBOAA, mean difference(MD) − 1.02, 95% credible interval (CrI) − 1.4 to − 0.67), common iliac artery (PBOCIA, MD − 0.84; 95%CrI − 1.36 to − 0.06) and internal iliac artery (PBOIIA, MD − 0.42; 95%CrI − 0.72 to − 0.13) significantly lowered blood loss volume, with PBOAA being more effective than PBOIIA (MD − 0.60; 95%CrI − 1.05 to − 0.17). PBOAA and PBOIIA also significantly decreased blood loss volume (MD − 2.33; 95%CrI − 3.74 to − 0.94, MD − 1.57; 95%CrI − 2.77 to − 0.47 respectively) and hysterectomy rate (OR 0.31; 95%CrI 0.16 to 0.54, OR 0.53; 95%CrI 0.29 to 0.92 respectively). PBOAA has the highest probability of being more effective in reducing the blood loss volume, blood transfusion volume, and hysterectomy rate. Performing PBOAA, PBOCIA, or PBOIIA in PAS patients is an effective way to minimize blood loss volume, while PBOAA and PBOIIA also reduce blood transfusion volume and hysterectomy rate. PBOAA is a notably more effective strategy to reduce blood loss volume than PBOIIA. • PBOAA, PBOCIA, and PBOIIA procedures can significantly reduce the blood loss volume compared to non-PBO intervention in PAS patients, of which PBOAA was more effective than the PBOIIA procedure. • PBOAA and PBOIIA could significantly reduce the blood transfusion volume and hysterectomy rate in contrast to the non-PBO intervention in patients with PAS. • According to our statistical treatment ranking, PBOAA was statistically superior in reducing blood transfusion volume, blood transfusion volume, and hysterectomy rate than other PBO procedures.