COMPARISON OF FLUTICASONE PROPIONATE AND BECLOMETHASONE DIPROPIONATE ON DIRECT AND INDIRECT MEASUREMENTS OF BRONCHIAL HYPERRESPONSIVENESS IN PATIENTS WITH STABLE ASTHMA

Background - Fluticasone propionate is a new inhaled corticosteroid wi th a 2:1 efficacy ratio compared with beclomethasone dipropionate with regard to lung function and symptom scores, without increased systemi c activity. The aim of this study was to investigate whether this was also the case for bronchial hyperresponsiveness, assessed by both a di rect (histamine) and an indirect (ultrasonically nebulised distilled w ater (UNDW)) provocation test. Methods - Fluticasone propionate, 750 m u g/day, and beclomethasone dipropionate, 1500 mu g/day, were compared in a randomised, double blind, crossover study consisting of two six week treatment periods, each preceded by a three week single blind pla cebo period. Twenty one non-smoking asthmatics (mean forced expiratory volume in one second (FEV(1)) 74.7% predicted, mean PC(20)histamine 0 .36 mg/ml) completed the study. Results - Fluticasone propionate and b eclomethasone dipropionate improved FEV(1), peak flow rates, asthma sy mptoms, and bronchial hyperresponsiveness to the same extent. Both flu ticasone propionate and beclomethasone dipropionate caused an increase in PC(20)histamine (mean 2.29 [95% confidence interval 1.45 to 3.13] and 1.95 [1.07 to 2.84] doubling doses, respectively) and in PD20UNDW (1.12 [0.55 to 1.70] and 1.28 [0.88 to 1.70] doubling doses, respectiv ely). Neither treatment changed morning serum cortisol levels, but flu ticasone propionate decreased the number of peripheral blood eosinophi ls less than beclomethasone dipropionate, indicating smaller systemic effects of fluticasone propionate.Conclusions - These findings show th at fluticasone propionate is as effective as twice the dose of beclome thasone dipropionate on bronchial hyperresponsiveness, assessed by pro vocation with both histamine and UNDW, without increased systemic acti vity.