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Testing bronchodilator responsiveness

Martin R. Miller
European Respiratory Journal 2019 54: 1902036; DOI: 10.1183/13993003.02036-2019
Martin R. Miller
Institute of Applied Health Sciences, University of Birmingham, Birmingham, UK
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Extract

The recent paper in the European Respiratory Journal by Janson et al. [1] on testing bronchodilator responsiveness suggests that it has no value in distinguishing asthma from COPD. The authors correctly state that “there are many different ways of defining bronchodilator reversibility.” However, they do not then mention any of them other than using the change in forced expiratory volume in 1 s (FEV1) standardised by the start value. This can lead to a sex and size bias in assessing bronchodilator response [2]. One method, that was recommended by the European Respiratory Society many years ago [3], standardises the change in FEV1 by the subject's predicted value and not their start value. Using this method it has been found that a change in FEV1 of 8% of predicted or more due to a bronchodilator was associated with a survival advantage [2]. This approach avoided all the pitfalls around the clinical diagnosis of COPD versus asthma. Previously it has been found that a change in FEV1 of 4% of predicted in COPD patients was associated with subjects being able to appreciate that their breathlessness was improved [4].

Abstract

A paper in the ERJ suggests that testing bronchodilator responsiveness is not helpful but the authors have not used the most appropriate method http://bit.ly/2MJR3KM

Footnotes

  • Conflict of interest: M.R. Miller has nothing to disclose.

  • Received October 16, 2019.
  • Accepted October 17, 2019.
  • Copyright ©ERS 2019
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Vol 54 Issue 6 Table of Contents
European Respiratory Journal: 54 (6)
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Testing bronchodilator responsiveness
Martin R. Miller
European Respiratory Journal Dec 2019, 54 (6) 1902036; DOI: 10.1183/13993003.02036-2019

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Testing bronchodilator responsiveness
Martin R. Miller
European Respiratory Journal Dec 2019, 54 (6) 1902036; DOI: 10.1183/13993003.02036-2019
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