Trends in and Outcomes of Deliveries Complicated by Cystic Fibrosis.

Objective: To characterize current trends and outcomes in pregnancies complicated by cystic fibrosis (CF) that resulted in delivery.

Methods: This repeated cross-sectional study used the U.S. National Inpatient Sample to identify delivery hospitalizations of patients with CF between 2000 and 2019. Trends in delivery hospitalizations of patients with CF were assessed using joinpoint regression to determine the average annual percent change (AAPC). The risk of adverse maternal and obstetric outcomes was compared between patients with and without CF using adjusted logistic regression models accounting for demographic, clinical, and hospital characteristics, with adjusted odds ratios (aORs) with 95% CIs as measures of association. The proportion of patients with CF and other chronic conditions such as pregestational diabetes was analyzed over time.

Results: From 2000 to 2019, the prevalence of CF at delivery increased from 2.1 to 10.4 per 100,000 deliveries (AAPC 6.7%, 95% CI 5.7-8.2%). The proportion of patients with CF and other chronic conditions increased from 18.0% to 37.3% (AAPC 3.1%, 95% CI 1.0-5.3%). Patients with CF were more likely to experience severe maternal morbidity (aOR 2.61, 95% CI 1.71-3.97), respiratory complications (aOR 17.45, 95% CI 11.85-25.68), venous thromboembolism (aOR 3.59, 95% CI 1.33-9.69), preterm delivery (aOR 2.15, 95% CI 1.79-2.59), abruption and antepartum hemorrhage (aOR 1.63, 95% CI 1.10-2.41), and gestational diabetes (aOR 2.47, 95% CI 2.47-3.70).

Conclusion: Although still infrequent (approximately 1 in 10,000), deliveries complicated by CF increased approximately fivefold over the study period. The proportion of patients with CF and other chronic conditions is increasing. Patients with CF are at increased risk for a broad range of adverse outcomes.