Impact of an Interdisciplinary Asthma Care Network on Emergency Department Visits and Hospitalizations

Background: Current national and international asthma clinical practice guidelines emphasize care continuity and adherence to guideline-based care delivered through interdisciplinary teams. However, the efficacy of such teams in reducing urgent asthma-related care has not yet been assessed. Objective: To measure the impact of an interdisciplinary asthma care network (ACN) on health services utilization. Methods: We identified a retrospective cohort of individuals with confirmed or suspected asthma who received specialized interdisciplinary asthma care in Southeastern Ontario, Canada between 2009-2018. Individuals were matched (on age, sex, and year of asthma diagnosis) to controls with suspected asthma who were not enrolled in the ACN. Asthma-related emergency department (ED) and inpatient visits were compared via zero inflated Poisson regression, stratified between pediatric and adults. Results: 1248 ACN patients were matched to 3629 non-ACN controls. Asthma-related ED visits were reduced for 21% of ACN patients versus 6.7% of non-ACN participants. Similarly, hospitalizations were reduced for 10.7% of ACN participants post-index visit compared to 1.4% of non-ACN participants (both P