Abstract
To the Editors: We applaud the American Thoracic Society (ATS) and the European Respiratory Society for their continuing efforts to optimise pulmonary function testing practice through disseminating guidelines, such as the recent spirometry guidelines 1. In reviewing this document, we wish to point out a spirometry practice that, although mentioned (but not endorsed) in the guidelines, can, in our experience, substantially improve and streamline the performance of spirometry by pulmonary function laboratories 2. Specifically, we point out the benefits of a modified spirometry technique in which the expiratory effort is relaxed after the first 3 s of expiration. As evaluated and reported in a small, randomised, controlled, crossover trial of two expiratory techniques and …
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