Pretreatment asthma control test score as a predictive score for clinical remission after bronchial thermoplasty in younger patients with severe asthma and preserved lung function

Abstract

Objective Bronchial thermoplasty (BT) decreases the incidence of asthma exacerbations, emergency room visits, and hospitalizations among patients with severe asthma. Predictors of BT effectiveness remain unclear as its mechanism of action and invasiveness remain obscure. This study aimed to identify factors that could predict BT outcomes. Methods Two respiratory physicians treated 20 consecutive patients with severe asthma using BT. The patients were assigned to groups based on clinical remission following an expert consensus proposed in 2020. Predictors of clinical remission were analyzed using asthma control test (ACT) score, pulmonary function and blood tests, and fractional exhaled nitric oxide. Results At baseline, the median age was 44 years (interquartile range [IQR], 31.0–52.8), and pre-bronchodilator (pre-BD) percent predicted forced expiratory volume in one second (%FEV1) was 85.9% (IQR, 74.8–100.5). Six (30%) patients achieved clinical remission. Among the patients treated with biologics, 20% had clinical remission, and 20% discontinued biologic therapy. The pre-BT ACT score was significantly lower in the group with than without remission (11.0 [IQR, 8.0–14.5] vs. 15.0 [IQR, 11.0–17.3], p = .016). Adverse events did not significantly differ between the groups. Conclusions To the best of our knowledge, this is the first study to use clinical remission as a criterion for evaluating BT efficacy. The pre-BT ACT score might a the predict response to BT in younger adult patients with severe asthma and pre-BD %FEV1 ≥ 70%.