The effect of oral corticosteroids on bronchodilator responses in COPD.

There have been suggestions that corticosteroid treatment might improve bronchodilator responses in chronic obstructive pulmonary disease (COPD). We have studied bronchodilator responses to salbutamol and to oxitropium bromide in 20 patients with stable moderate to severe COPD. Dose responses to the two bronchodilators were tested before and after 3 week courses of placebo and 30 mg prednisolone. Thirteen patients were taking inhaled corticosteroids. There were no significant changes in numbers of responses or maximum bronchodilator effects from either bronchodilator, although there was a trend towards higher maximum levels after 3 weeks of prednisolone. Spirometry measured at home each morning before and after oxitropium bromide showed no difference between prednisolone and placebo periods. This study provides no evidence for a significant effect on bronchodilator responses to beta-agonists or anticholinergic agents from 3 weeks of oral prednisolone in moderately severe COPD.