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Home-Based Prescribed Pulmonary Exercise in Patients with Stable Chronic Obstructive Pulmonary Disease
Published on: August 24, 2019
The minimal important difference of exercise tests in severe COPD.
M A Puhan1, D Chandra, Z Mosenifar
1Dept of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA. mpuhan@jhsph.edu
The European Respiratory Journal
|August 10, 2010
Summary
This study determined the minimal important difference (MID) for 6-min walk distance (6MWD) and maximal cycle exercise capacity (MCEC) in severe COPD patients. A MID of 26m for 6MWD and 4W for MCEC is suggested for clinical relevance.
Area of Science:
- Pulmonary Medicine
- Rehabilitation Science
- Clinical Exercise Physiology
Background:
- Severe chronic obstructive pulmonary disease (COPD) significantly impacts exercise capacity.
- Establishing minimal important differences (MIDs) is crucial for interpreting clinical trial outcomes and patient-reported changes in severe COPD.
Purpose of the Study:
- To determine the minimal important difference (MID) for 6-minute walk distance (6MWD) and maximal cycle exercise capacity (MCEC) in patients with severe COPD.
- To provide clinically relevant benchmarks for exercise test results in this population.
Main Methods:
- Anchor-based and distribution-based methods were used to estimate MID.
- Anchor selection included St George's Respiratory Questionnaire and UCSD Shortness of Breath Questionnaire.
- 1,218 patients from the National Emphysema Treatment Trial were analyzed pre- and post-rehabilitation and at 6 months post-randomization.
Main Results:
- Anchor-based MID for 6MWD ranged from 18.9m to 26.4m; distribution-based estimates were 25.7m to 30.6m.
- Anchor-based MID for MCEC ranged from 2.2W to 3.3W; distribution-based estimates were 5.3W to 5.5W.
- A suggested MID of 26 ± 2m for 6MWD and 4 ± 1W for MCEC was proposed for severe COPD.
Conclusions:
- The study provides evidence-based MIDs for key exercise parameters in severe COPD.
- These MIDs can aid in the interpretation of exercise test results in clinical practice and research.
- The suggested MIDs offer valuable guidance for assessing treatment efficacy in severe COPD patients.
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