Lung function in provoked asthma: responses to inhaled urea, methacholine and isoprenaline.


1. Lung function was studied in fifty-six symptom-free asthmatic subjects after the inhalation of urea, an agent not previously used for asthma provocation. The effects of urea were compared with those produced by the inhalation of methacholine and of isoprenaline. 2. After urea ventilatory capacity was impaired in 68% of subjects and improved in 16%. This… (More)


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