Maternal asthma and the risk of hypertensive disorders of pregnancy: a systematic review and meta-analysis of cohort studies.

Objective: The aim of this study was to demonstrate the association between maternal asthma and the risk of hypertensive disorders of pregnancy. Methods: A systematic search of seven databases was conducted. A meta-analysis was performed to calculate risk ratios and 95% CI using random-effects models. Results: Asthma was associated with an increased risk of pregnancy-induced hypertension (RR 1.45, 95%CI 1.29-1.63), transient hypertension of pregnancy (RR 2.00, 95%CI 1.52-2.63), preeclampsia or eclampsia (RR 1.28, 95%CI 1.25-1.32), preeclampsia (RR 1.43, 95%CI 1.31-1.57) and eclampsia (RR 1.56, 95%CI 1.13-2.15). Conclusion: The meta-analysis illustrated that asthma was significantly increased risk of hypertension during pregnancy.