Health characteristics of patients with asthma, COPD and asthma–COPD overlap in the NHANES database
Received 6 March 2018
Accepted for publication 23 July 2018
Published 12 September 2018 Volume 2018:13 Pages 2859—2868
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Amy Norman
Peer reviewer comments 3
Editor who approved publication: Dr Richard Russell
Jean-Pierre Llanos,1 Hector Ortega,2 Guillaume Germain,3 Mei Sheng Duh,4 Marie-Helene Lafeuille,3 Sean Tiggelaar,3 Christopher F Bell1, Beth Hahn1
1US Medical Affairs, GSK, Research Triangle Park, NC, USA; 2US Medical Affairs, GSK, La Jolla, CA, USA; 3Groupe d’Analyse, Ltée, Montréal, QC, Canada; 4Analysis Group, Inc., Boston, MA, USA
Introduction: Asthma and COPD have overlapping characteristics. As there are limited data on whether asthma–COPD overlap (ACO) represents a distinct condition, this study aimed to determine the similarities and differences of ACO with asthma and COPD.
Methods: US population-based, cross-sectional study using National Health and Nutrition Examination Survey data (2009–2012) compared participants with ACO vs those with asthma or COPD, each as mutually exclusive disease states. Demographics, health status, disability/limitations, health care resource utilization, clinical characteristics, and peripheral blood eosinophil counts were analyzed.
Results: A total of 1,609, 479, and 299 participants with asthma, COPD, and ACO, respectively, were included. An age-matched asthma subgroup included 299 participants from the asthma group. Compared with asthma and COPD, participants with ACO had worse health status, increased disease burden, and more comorbid conditions. The ACO, vs age-matched asthma subgroup, had lower percent predicted prebronchodilator forced expiratory volume in 1 second (82.1% vs 88.0%; P=0.017). The ACO group had significantly more asthma attacks in the past year than the age-matched asthma subgroup (49.8% vs 38.4%; P<0.001). The ACO group had more participants with postbronchodilator forced expiratory volume in 1 second <80% predicted (52.1%) vs COPD (30.8%; P=0.003) and more participants with blood eosinophil counts ≥400 cells/µL (16.9%) vs COPD (9.5%; P=0.007) and the asthma subgroup (6.7%; P=0.014).
Conclusion: The ACO group represents an important subset of patients with chronic respiratory disease with an increased burden of disease over asthma and COPD individually. Early identification of this population will enable appropriate therapeutic interventions in a timely manner.
Keywords: lung function, health status, eosinophils, asthma attack, respiratory disease
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