Trends in and Maternal Outcomes of Delivery Hospitalizations of Patients With an Asthma Diagnosis.

Objective: To characterize asthma prevalence and outcomes during U.S. delivery hospitalizations.
Methods: For this repeated cross-sectional analysis, deliveries to women aged 15-54 years with asthma were identified in the 2000-2018 National Inpatient Sample, which approximates a 20% stratified sample of all hospitalizations nationally. Temporal trends in asthma were analyzed using joinpoint regression to estimate the average annual percent change with 95% CIs. The association of asthma with other comorbid conditions was analyzed. The relationship between asthma and several adverse maternal outcomes was analyzed with unadjusted and adjusted logistic regression models, with unadjusted odds ratios and adjusted odds ratios (aORs) as measures of effect. Risk for and trends in a composite of rare, but severe, respiratory complications also were analyzed.
Results: An estimated 73,109,790 delivery hospitalizations from 2000 to 2018 were included in the analysis, of which 2,221,644 (3.0%) had a diagnosis of asthma. (Unweighted, the study sample included 15,213,024 deliveries, of which 462,276 [3.0%] had a diagnosis of asthma.) Asthma diagnoses rose from 1.2% in 2000 to 5.3% in 2018, representing an average annual percent change of 8.3% (95% CI 7.4-9.2%). Asthma was more common among women with obesity and chronic hypertension. In adjusted analyses, asthma was associated with severe maternal morbidity (aOR 1.50, 95% CI 1.45-1.55), preeclampsia and gestational hypertension (aOR 1.29, 95% CI 1.26-1.30), postpartum hemorrhage (aOR 1.21, 95% CI 1.19-1.24), cesarean delivery (aOR 1.16, 95% CI 1.15-1.18), gestational diabetes (aOR 1.20, 95% CI 1.18-1.21), venous thromboembolism (aOR 1.79, 95% CI 1.65-1.95), and preterm delivery (aOR 1.27, 95% CI 1.25-1.29). From 2000 to 2018, severe respiratory complications decreased from 72 per 10,000 deliveries with asthma to 14 per 10,000 deliveries with asthma (average annual percent change -9.4%, 95% CI -13.3% to -5.3%). This decreasing risk was offset on a population level by an increase in the risk of asthma.
Conclusion: Asthma is increasing during deliveries, is associated with adverse maternal outcomes, and is associated with comorbid conditions. Severe respiratory complications are decreasing proportionately among deliveries with asthma, but are stable on a population basis.
Competing Interests: Financial Disclosure Dr. D'Alton had a senior leadership role in ACOG II's Safe Motherhood Initiative, which received unrestricted funding from Merck for Mothers. Dr. Wright disclosed that he received royalties from UpToDate for writing/review of chapters related to cervical dysplasia, human papillomavirus, and cervical cancer. He served as a consultant for Clovis Oncology and participated in their advisory board (March 2019). He performed medicolegal review of malpractice cases related to delayed diagnosis of gynecologic cancer and intraoperative complications during gynecologic surgery. He is currently serving on the SGO Board of Directors (no monetary compensation) from 2019 to 2022. He conducted epidemiologic research trials examining patterns of care for ovarian, uterine, and cervical cancer for Merck. Lastly, he has also performed analysis of and provided education on clinical trials data for Otsuka Pharmacovigilance. The other authors did not report any potential conflicts of interest.
(Copyright © 2021 by the American College of Obstetricians and Gynecologists. Published by Wolters Kluwer Health, Inc. All rights reserved.)