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. 1983 Jul;38(7):506–511. doi: 10.1136/thx.38.7.506

The bronchial response to cold air challenge: evidence for different mechanisms in normal and asthmatic subjects.

R W Heaton, A F Henderson, B J Gray, J F Costello
PMCID: PMC459596  PMID: 6225213

Abstract

We have investigated possible mechanisms of response to airway cooling by studying the effects of sodium cromoglycate and ipratropium bromide on the changes in airways resistance that followed eucapnic hyperventilation with subfreezing air in a group of 12 patients with mild asthma and 10 normal subjects. We have also studied the period of refractoriness to repeated challenge. Maximum bronchoconstriction was not reduced after the second challenge, but in the asthmatics the one-second forced expiratory volume recovered more rapidly after the second challenge. The response in normal subjects was completely abolished by ipratropium bromide (p less than 0.0005) whereas sodium cromoglycate was without effect. In the asthmatics both ipratropium and cromoglycate were effective in attenuating the response (p less than 0.005). These results suggest that in normal subjects the response to airway cooling is produced predominantly via neural mechanisms, whereas in asthmatics there is an additional mechanism which can be abolished by sodium cromoglycate.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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