Abstract
1. The antitussive properties of bronchodilators were evaluated in a total of 47 normal volunteers. 2. Cough was induced by inhalation of ultrasonically nebulized solutions of distilled water and hypotonic saline. 3. Inhaled fenoterol hydrobromide (360 micrograms; 20 volunteers) and inhaled ipratropium bromide (72 micrograms; 14 volunteers) both significantly reduced couch compared with placebo (P less than 0.01). Oral salbutamol sulphate (4 mg; 11 volunteers) and oral pirenzepine hydrochloride (50 mg; 14 volunteers) had lesser effects. 4. Cough inhibition correlated with a small but statistically significant degree of bronchodilatation as measured by specific airway conductance (sGaw) and forced expiratory volume in one second (FEV1) in six normal subjects studied with each treatment in a placebo controlled, double blind study (r = 0.67, P less than 0.001). 5. Small reductions in airway tone are associated with a reduced cough response elicited by inhaled ultrasonically nebulized distilled water.
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