The association between polyhydramnios and the risk of placenta abruption: a meta-analysis.

Background: The results of studies about the effect of polyhydramnios on the risk of placental abruption are a controversy. This study was conducted to determine the association between polyhydramnios and the risk of placental abruption.Methods: PubMed, Scopus, and Web of Science were searched in September 2017 along with references from meta-analyses and reviews. We assessed publication bias using the rank correlation test (Begg's test) and the regression asymmetry test (Egger's test). The studies' heterogeneity was measured by the Q-statistic and I-squared (I2) tests. The random-effects model was conducted to obtain pooled odds ratio (OR) as a measure of the association between polyhydramnios and the risk of placental abruption.Results: A total of 10 studies were included in this meta-analysis with a sample of 198,359 participants. There was a significant association between polyhydramnios and the risk of placental abruption [OR: 1.93 (95% CI: 1.23-2.63)].Conclusions: The present study is the first meta-analysis that reported polyhydramnios is a risk factor for placental abruption.