Allergy Asthma Immunol Res.  2017 Sep;9(5):431-437. 10.4168/aair.2017.9.5.431.

Asthma-COPD Overlap Shows Favorable Clinical Outcomes Compared to Pure COPD in a Korean COPD Cohort

Affiliations
  • 1Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea. littmann@yuhs.ac
  • 2Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea.
  • 3Regional Center for Respiratory Disease, Yeungnam University Medicial Center, Yeungnam University College of Medicine, Daegu, Korea.
  • 4Division of Respiratory and Allergy Medicine, Soonchunhyang University Seoul Hospital, Seoul, Korea.
  • 5Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
  • 6Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea.
  • 7Division of Pulmonary Medicine, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.

Abstract

PURPOSE
Comparisons of the characteristics of chronic obstructive pulmonary disease (COPD) and asthma-COPD overlap syndrome (ACOS) have been the focus of several studies since the diseases were defined by the Global Initiative for Asthma and Global Initiative for Chronic Obstructive Lung Disease guidelines. However, no consensus is available yet. In this study, we aimed to compare the characteristics of asthma-COPD overlap (ACO) and COPD.
METHODS
We retrospectively reviewed 1,504 patients with COPD in a Korean COPD Subtype Study cohort. The occurrence of ACO was defined as a positive response to a bronchodilator (an increase in forced expiratory volume in 1 second [FEV1] of 12% and 200 mL).
RESULTS
Among 1,504 patients with COPD, 223 (14.8%) were diagnosed with ACO. Men (95.5%) and current smokers (32.9%) were more prevalent in the ACO group compared with the pure COPD group (90.5% and 25.3%, respectively; P=0.015 and P=0.026, respectively). Patients with ACO had a better quality of life (St. George's Respiratory Questionnaire for COPD score=31.0±18.0 [mean±standard deviation]) than those with pure COPD (35.3±19.1) (P=0.002). Although the prevalence of acute exacerbation was not different between the 2 groups, patients with severe exacerbation required hospital admission significantly more frequently in the pure COPD group than in the ACO group. Patients with ACO showed a higher likelihood of FEV1 recovery than those with pure COPD (P<0.001).
CONCLUSIONS
We suggest that ACO is characterized by less severe symptoms, and therefore it might lead to rare severe exacerbation and the possibility of lung function recovery.

Keyword

Chronic obstructive pulmonary disease; asthma-chronic obstructive pulmonary disease overlap syndrome; disease progression

MeSH Terms

Asthma
Cohort Studies*
Consensus
Disease Progression
Forced Expiratory Volume
Humans
Lung
Male
Prevalence
Pulmonary Disease, Chronic Obstructive*
Quality of Life
Recovery of Function
Retrospective Studies

Figure

  • Fig. 1 Study flow. KOCOSS, Korean Chronic Obstructive Pulmonary Disease Subtype Study; COPD, chronic obstructive pulmonary disease; ACO, asthma-chronic obstructive pulmonary disease overlap.

  • Fig. 2 Comparisons of (A) exacerbation rates, (B) severe exacerbation rates required hospitalization, and (C) prevalence of severe exacerbation, between COPD and ACO. COPD, chronic obstructive pulmonary disease; ACO, asthma-chronic obstructive pulmonary disease overlap.

  • Fig. 3 Comparison of pulmonary function trends between COPD and ACO. Predicted FEV1 (A) and absolute FEV1 (B) are shown. COPD, chronic obstructive pulmonary disease; ACO, asthma-chronic obstructive pulmonary disease overlap; FEV1, forced expiratory volume in 1


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