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Expiratory flow limitation (EFL) detected non-invasively as a phenotypic characteristic of COPD

Bernt Bøgvald Aarli, Peter M.A. Calverley, Tomal Mikal Lind Eagan, Per Sigvald Bakke, Jon Andrew Hardie
European Respiratory Journal 2011 38: p925; DOI:
Bernt Bøgvald Aarli
1Department of Thoracic Medicine, Haukeland University Hospital, Bergen, Norway
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Peter M.A. Calverley
3University Department of Medicine, University Hospital Aintree, Liverpool, United Kingdom
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Tomal Mikal Lind Eagan
2Institute of Medicine, University of Bergen, Bergen, Norway
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Per Sigvald Bakke
2Institute of Medicine, University of Bergen, Bergen, Norway
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Jon Andrew Hardie
2Institute of Medicine, University of Bergen, Bergen, Norway
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Abstract

Within-breath change in reactance at 5Hz during tidal breathing reliably detects EFL in patients with COPD. We used the method proposed by Dellaca et al to determine presence of EFL and its relationship to spirometry and demographics of 424 healthy smokers and COPD patients from the Bergen cohort of the ECLIPSE study.

Aim: Establish the prevalence of EFL by GOLD stage and its relationship to dyspnoea and BMI.

274 stable COPD patients and 150 healthy smoking controls performed spirometry and tidal impulse oscillometry.

Results: Presence of EFL in healthy smokers, COPD grade 2,3, and 4 was.7%, 13%, 28% and 40% respectively. Inspiratory resistance and reactance at 5Hz were higher in COPD than smokers but differed little across GOLD stages.

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Conclusion: EFL became more common in higher GOLD stages, but a significant number of patiens in all GOLD stages were not flow limited at rest. In GOLD stage 2 and 3 EFL patients were more breathless, despite similar spirometry, but EFL also tracked obesity, which may contribute to both EFL and dyspnoea. Presence of EFL has potential to be an independent phenotypic characteristic in stable COPD.

  • © 2011 ERS
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Expiratory flow limitation (EFL) detected non-invasively as a phenotypic characteristic of COPD
Bernt Bøgvald Aarli, Peter M.A. Calverley, Tomal Mikal Lind Eagan, Per Sigvald Bakke, Jon Andrew Hardie
European Respiratory Journal Sep 2011, 38 (Suppl 55) p925;

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Expiratory flow limitation (EFL) detected non-invasively as a phenotypic characteristic of COPD
Bernt Bøgvald Aarli, Peter M.A. Calverley, Tomal Mikal Lind Eagan, Per Sigvald Bakke, Jon Andrew Hardie
European Respiratory Journal Sep 2011, 38 (Suppl 55) p925;
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