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Acute postbronchodilator changes in pulmonary function parameters in patients with chronic airways obstruction
1Division of Pulmonary and Critical Care Medicine, VA Medical Center, Lexington, KY 40511.
Chest
|March 1, 1988
Summary
Assessing chronic airways obstruction reversibility in nonasthmatic patients using bronchodilators rarely requires more than FEV1 and FEF25-75% measurements. Other pulmonary function tests provide limited additional diagnostic value and may introduce errors.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Chronic airways obstruction is a significant respiratory condition.
- Assessing reversibility is crucial for effective management.
- Nonasthmatic patients present unique challenges in diagnosis.
Purpose of the Study:
- To evaluate the diagnostic utility of various pulmonary function tests beyond FEV1.
- To determine the value of FVC, FEF25-75%, static lung volumes, Raw, and sGaw in assessing bronchodilator reversibility.
- To identify potential sources of misleading results in chronic airways obstruction assessment.
Main Methods:
- Conducted pulmonary function studies before and after inhaled bronchodilator administration.
- Analyzed data from 686 spirometric tests in 517 nonasthmatic patients.
- Compared responses in FEV1, FEF25-75%, and FVC measurements.
Main Results:
- 38% of tests showed a significant response to bronchodilators.
- FEV1 and/or FEF25-75% changes accounted for 93% of significant responses.
- Isolated FVC improvement occurred in only 7% of responsive studies.
- Other parameters (static lung volumes, Raw, sGaw) offered little additional information.
Conclusions:
- FEV1 and FEF25-75% are the most informative spirometric parameters for assessing bronchodilator reversibility in nonasthmatic patients.
- Routine analysis of static lung volumes, Raw, and sGaw provides limited clinical value.
- Measurement errors in FVC and FEF25-75% can lead to misleading interpretations.