Favorable longitudinal change of lung function in patients with asthma-COPD overlap from a COPD cohort

Respir Res. 2018 Mar 2;19(1):36. doi: 10.1186/s12931-018-0737-8.

Abstract

Background: The recognition of asthma-chronic obstructive pulmonary disease (COPD) overlap (ACO) as a distinct phenotype of COPD or asthma has increased. Although ACO has worse clinical features than non-ACO COPD, limited information is available on long-term outcomes of lung function decline for ACO and non-ACO COPD.

Methods: COPD patients with at least 3 years of follow-up were selected from the Korean Obstructive Lung Disease cohort. ACO was defined based on 3 major criteria: 1) airflow limitation in individuals 40 years of age and older, 2) ≥10 pack-years of smoking history, and 3) a history of asthma or bronchodilator response of > 400 mL in forced expiratory volume in 1 s (FEV1) at baseline; and at least 1 minor criterion: 1) history of atopy or allergic rhinitis, 2) two separated bronchodilator responses of ≥12% and 200 mL in FEV1, or 3) peripheral blood eosinophils ≥300 cells/μL. Lung function decline was compared using a linear mixed effects model for longitudinal data with random intercept and random slope.

Results: Among 239 patients, 47 were diagnosed with ACO (19.7%). During the follow-up period, change in smoking status, use of inhaled corticosteroids (ICS) and long-acting β2-agonists or ICS and at least 2 exacerbations per year were similar between patients with non-ACO COPD and ACO. Over a median follow-up duration of 5.8 years, patients with non-ACO COPD experienced a faster annual decline in pre-bronchodilator FEV1 than patients with ACO (- 29.3 ml/year vs. -13.9 ml/year, P = 0.042), which was persistent after adjustment for confounders affecting lung function decline.

Conclusion: Patients with ACO showed favorable longitudinal changes in lung function compared to COPD patients over a median follow-up of 5.8 years.

Keywords: Asthma; Chronic obstructive pulmonary disease; Lung function.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Asthma / diagnosis*
  • Asthma / epidemiology
  • Asthma / physiopathology*
  • Cohort Studies
  • Female
  • Follow-Up Studies
  • Humans
  • Longitudinal Studies
  • Lung / physiology*
  • Male
  • Middle Aged
  • Pulmonary Disease, Chronic Obstructive / diagnosis*
  • Pulmonary Disease, Chronic Obstructive / epidemiology
  • Pulmonary Disease, Chronic Obstructive / physiopathology*
  • Respiratory Function Tests / trends
  • Spirometry / trends