Is Bronchodilation Testing Routinely Useful in All Asthmatic Children?

Background

The reversibility of bronchial obstruction is needed to diagnose asthma. Bronchodilation (BD) testing is, therefore, used in asthma work-up. This study explored the benefit of performing BD testing in asthmatic children without bronchial obstruction.

Methods

The study included 60 subjects with asthma and normal lung function, 13 (21.7%) females and 47 (78.3%) males; the mean age was 11.5 years, 26 were adolescents, and 34 were children. Lung function, symptoms, use of asthma medications, type 2 inflammation, and asthma control were assessed in all subjects.

Results

Eleven (18%) subjects positively responded to BD testing. Fifty-five percent of subjects were uncontrolled based on Global Initiative for Asthma (GINA) criteria. The multivariate analysis identified 2 factors associated with a positive response to BD testing: FEV1 [odds ratio (OR) = 0.91) and ACT (OR = 0.79).

Conclusions

This study showed that BD testing could give additional helpful information in clinical practice. In addition, uncontrolled asthma, based on GINA criteria, was prevalent in children with normal lung function.