Effects of prednisolone in chronic airflow limitation.

A double-blind, randomised, placebo-controlled, crossover trial of prednisolone (40 mg daily for 14 days) was carried out in 43 patients with chronic airflow limitation (mean age 60 years, mean FEV1 1.02 litres, FEV1/FVC ratio 43.7%). Several subjective and objective variables for response were measured. Significant improvements occurred with prednisolone in most variables measured, but improvements also occurred with placebo in some variables. The improvements with prednisolone in general wellbeing, 12 min walk distance, peak expiratory flow, FEV1, and relaxed vital capacity were significantly greater than those with placebo. Clinical assessment and assessment of atopic status did not reveal any feature of major predictive value for steroid responsiveness. A proportion of patients with chronic airflow limitation do improve on oral corticosteroids and the continued use of such trials in clinical practice is justified, though a placebo period should be included, and several variables for response should be measured.