Abstract |
Postexertional wheezing is an important clinical sign of nonspecific airway hyperreactivity. We have studied wheezing after exercise in 6 asthmatic subjects, 13 to 20 yr of age, using spectral analysis of recorded tracheal sounds. Automated spectral characterization was used to measure wheezing as a proportion of respiratory time. Anticholinergic treatment with ipratropium bromide ( Atrovent) was compared with placebo to investigate effects on postexertional wheezing, and pulmonary function was compared with the result of respiratory sound analysis. Atrovent did not abolish exercise-induced bronchospasm but improved preexercise lung function and thereby caused a parallel upward shift in the response curves. Wheezing after Atrovent was significantly less, later in onset, and mainly expiratory at 20 min after exercise. Wheezing as a percentage of total respiratory time correlated well with FEV1, Vmax50, and SGaw. Analysis of respiratory sounds and automated quantification of wheezing may be a useful complementary test of bronchial obstruction in asthma.
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Authors | H Pasterkamp, A Tal, F Leahy, R Fenton, V Chernick |
Journal | The American review of respiratory disease
(Am Rev Respir Dis)
Vol. 132
Issue 1
Pg. 16-21
(Jul 1985)
ISSN: 0003-0805 [Print] United States |
PMID | 3160273
(Publication Type: Clinical Trial, Controlled Clinical Trial, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Atropine Derivatives
- Ipratropium
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Topics |
- Adolescent
- Adult
- Asthma
(drug therapy)
- Asthma, Exercise-Induced
(diagnosis, drug therapy, physiopathology)
- Atropine Derivatives
(therapeutic use)
- Auscultation
- Female
- Humans
- Ipratropium
(therapeutic use)
- Male
- Respiratory Function Tests
- Respiratory Sounds
(diagnosis, physiopathology)
- Spirometry
- Trachea
(physiopathology)
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