The use of inhaled corticosteroids (ICS) alone may be sufficient for asthma control in mild asthma. We investigated the effect of inhaled steroid and beta-2 agonist combination on airway function and inflammation in mild asthma.We randomized 20 mild persistent asthma patients treated with the 200μg budesonide (10 patients) or budesonide 200μg -formoterol 12μg (10 patients) twice daily for 4 weeks. We investigated the effects of treatment groups on pulmonary function tests by spirometry and eosinophil percentage and eosinophil cationic protein (ECP) levels in serum and induced sputum. We compared values before and after treatment within budesonide and budesonide-formoterol groups and after treatment between groups. We observed that eosinophil percentage and ECP levels in serum and induced sputum decreased significantly after treatment in both treatment groups. Only the decrease in serum eosinophil percentage level was not significant in the budesonide group. On the other that, there was no significant reduction of inflammatory markers between the two treatment groups. The spirometric measurements (FVC, FEV1, FEF25-75) showed a statistically significant increase within the budesonide-formoterol treatment group, but not in the budesonide group. These measurements were not statistically changed between the two treatment groups. In patients with mild asthma, budesonide and formoterol combination therapy did not add to the improvement of airway obstruction and inflammation more than budesonide therapy.
Key words: Asthma, inhaled steroid, long-acting β2-agonist, induced sputum, eosinophil, ECP
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