4.5 Review

Defining hyperinflation as 'dynamic': Moving toward the slope

Journal

RESPIRATORY MEDICINE
Volume 107, Issue 7, Pages 953-958

Publisher

W B SAUNDERS CO LTD
DOI: 10.1016/j.rmed.2013.02.012

Keywords

Bronchodilator effect; Exercise; Helium; Hyperoxia; Lung diseases; Obstructive; Lung volume measurements

Funding

  1. National Sanitarium Association-University of Toronto Chair in Respiratory Rehabilitation Research
  2. NIHR
  3. National Institute for Health Research [CL-2010-11-002] Funding Source: researchfish

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Measuring the severity of dynamic hyperinflation is a useful clinical approach to assess the effect of therapeutic interventions and explain their impact on exercise tolerance. Dynamic hyperinflation is typically quantified by the change in end expiratory lung volume from rest to the end of exercise. The result may be inconsistent with disease severity and does not clearly explain how exercise tolerance improves with therapy. Using a re-examination of selected studies, we suggest an operational definition of dynamic hyperinflation using the slope derived from serial measures of inspiratory capacity expressed as a linear function of ventilation that clearly differentiates whether therapies affect static or dynamic hyperinflation or affect lung volume only as a consequence of reducing ventilation. With this approach, the magnitude of the result is consistent with disease severity and is a more reliable outcome as it uses serial measures rather than a single time point estimate. The therapies re-evaluated are breathing helium or hyperoxic gas mixtures, bronchodilation and exercise training. A clear definition of dynamic hyperinflation will assist clinicians in assessing the impact of therapeutic interventions. (C) 2013 Elsevier Ltd. All rights reserved.

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