Summary
A vagal mechanism appears to be involved in the development of exercise-induced asthma (EIA), although previous studies have failed to demonstrate a protective effect of anticholinergic drugs against post-exercise bronchoconstriction.
To reassess this hypothesis the effect of a new anticholinergic drug, Oxitropium Bromide (OTB) has been studied in ten subjects with documented EIA.
There was no change after inhalation of a placebo. Administration of OTB led to bronchodilatation and totally blocked post-exercise bronchoconstriction in 7 patients, and it did so partly in 2. The response to the drug appeared to depend on pretest respiratory function.
Thus, the anticholinergic drug OTB may protect against EIA in most patients, confirming the role of a vagal cholinergic mechanism in EIA.
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Taytard, A., Vergeret, J., Guenard, H. et al. Prevention of exercise-induced asthma by oxitropium bromide. Eur J Clin Pharmacol 33, 455–458 (1987). https://doi.org/10.1007/BF00544234
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DOI: https://doi.org/10.1007/BF00544234