Impact of Asthma Medications During Pregnancy on Asthma Exacerbation, Maternal, and Neonatal Outcomes.

ABSTRACT

BACKGROUND: Asthma affects 5% to 13% of pregnant women, and many require daily pharmacotherapy to achieve asthma control; however, adherence to medication during pregnancy often decreases. OBJECTIVE: To understand the association between the use of or adherence to asthma medication with asthma exacerbation and maternal/neonatal outcomes. METHODS: Using linked population-based administrative databases from Alberta, Canada (2012-2018), pregnant women with asthma were categorized based on asthma medication use 1 year before pregnancy short-acting ß-agonists (SABA), inhaled corticosteroids (ICS), and ICS with long-acting ß-agonists (ICS+LABA). Women on ICS+LABA were grouped by trajectory of adherence during pregnancy using group-based trajectory modeling. Logistic regressions were used to estimate the associations between the use of or trajectories of adherence to asthma medication during pregnancy with asthma exacerbation and maternal/neonatal outcomes. RESULTS: Overall, 13,509 of 238,751 (5.7%) pregnant women had asthma before pregnancy (SABA 24.7%; ICS 12.5%; ICS+LABA 25.1%; none 36.1%). The use of SABA (adjusted odds ratio [aOR] 1.79, 95% confidence interval [CI] 1.21, 2.64), ICS (aOR 3.37, 95% CI 2.10, 5.39), and ICS+LABA (aOR 3.64, 95% CI 2.57, 5.17) had greater odds of disease exacerbation than no asthma medication during pregnancy. ICS+LABA adherence groups during pregnancy included low (79.8%), moderate-to-decreasing (14.0%), and moderate-to-increasing (6.2%). The moderate-to-decreasing (aOR 1.45, 95% CI 1.14, 1.84) and moderate-to-increasing (aOR 2.06, 95% CI 1.50, 2.83) adherence groups had greater odds of disease exacerbation than the low adherence group. ICS use during pregnancy decreased odds of preterm birth (aOR 0.62; 95% CI 0.39, 0.99) and neonatal intensive care unit admission (aOR 0.66; 95% CI 0.45, 0.97). Other group comparisons were not statistically significant. CONCLUSIONS: Our study shows the importance of continuing asthma maintenance medication during pregnancy to improve outcomes. Future research should study the postpartum and long-term outcomes with asthma medication during pregnancy.