[A meta-analysis of prognosis after bipolar umbilical cord coagulation or radiofrequency ablation to reduce complicated monochorionic multiple pregnancies].

Objective: To evaluate the prognosis and complications after reduction of monochorionic multifetal pregnancies using bipolar umbilical cord coagulation (BCC) or radiofrequency ablation (RFA). Methods: A literature search were performed by using online databases including PubMed, Embase, and COCHRANE.The publications that described prognosis and complications after selective reduction of monochorionic twin pregnancies using either BCC or RFA for studies with clear outcome data were identified. Results: We identified five retrospective cohort studies for the meta-analysis and 231 cases of BCC and 174 cases of RFA.There was no statistical difference in overall survival after reduction between BCC group (79.2%) and RFA groups (76.4%) ( RR =0.96; 95% CI : 0.86~1.08; P =0.48). Neonatal mortality was similar in both groups (8.2% vs 11.1%, respectively; RR =1.34; 95% CI : 0.60~2.99; P =0.48). However, intrauterine fetal death (IUFD) in the RFA group was 13.6%, and it significantly higher than that in the BCC group 7.7% ( RR =2.15; 95% CI : 1.10~4.21; P =0.03). In contrast, after reduction, those in the RFA group had less preterm premature rupture of membranes (PPROM) compared with the BCC group (17.1% vs 27.5%, RR =0.58; 95% CI : 0.39~0.86; P =0.007). Conclusions: RFA and BCC groups have similar overall survival for complicated monochromic multiple pregnancies, but RFA was more prone to IUFD, and BCC tended to have more PPROM.Thus, procedures should be chosen according to specific clinical situations and pregnancy conditions.