Abstract
BackgroundThe purpose of this study was to evaluate the correlation between immediate responsiveness with the short-acting β2-agonist salbutamol and effects of treatment with the ultra-long-acting β2-agonist indacaterol in patients with chronic obstructive pulmonary disease (COPD).MethodsThe REVERBREZ study was a phase IV, multicentre, open-label study in which patients with moderate-to-severe COPD received indacaterol 150 μg once-daily for 5 months. The primary endpoint was the correlation between immediate response of forced expiratory volume in 1 s (FEV1) post-inhalation of salbutamol (400 μg) at study entry and the change from baseline in trough FEV1 after 1 month of indacaterol. Secondary endpoints included dyspnoea measured by the modified Medical Research Council (mMRC) grade and health-related quality of life measured by the clinical COPD questionnaire (CCQ).ResultsOf the 602 patients enrolled from 177 centres in France, 543 patients received at least one indacaterol dose, 512 patients completed 1 month of indacaterol treatment (primary endpoint), and 400 patients completed 5 months of treatment. At study entry, mean FEV1 values before and after salbutamol inhalation were 1.54 ± 0.50 L and 1.65 ± 0.53 L, respectively. Based on the magnitude of an immediate response of FEV1 after salbutamol inhalation at study entry, patients were classified into reversible (Rv, ≥12% and ≥200 mL from pre-salbutamol value; n = 106) and non-reversible (NRv, <12% or <200 mL from pre-salbutamol value; n = 431) groups. After 1 month of indacaterol treatment, mean absolute and relative difference in trough FEV1 were 100 mL and 9%, respectively. No significant correlation was found between the immediate FEV1 response to salbutamol at study entry and change from baseline in trough FEV1 after 1 month of indacaterol treatment (correlation coefficient = 0.056 [95% CI;−0.032, 0.144] for absolute response and 0.028 [95% CI;−0.06, 0.116] for relative response). At all subsequent visits, mMRC and CCQ scores, and FEV1 improved from baseline with no significant difference between the Rv and NRv groups.ConclusionsImmediate FEV1 response to salbutamol did not predict the long-term benefits observed with indacaterol treatment in patients with COPD. Patients considered reversible or non-reversible to salbutamol showed comparable improvements in lung function, dyspnoea and health-related quality of life.Trial registrationClinicalTrials.gov: NCT01272362. Date: January 5, 2011
Highlights
The purpose of this study was to evaluate the correlation between immediate responsiveness with the short-acting β2-agonist salbutamol and effects of treatment with the ultra-long-acting β2-agonist indacaterol in patients with chronic obstructive pulmonary disease (COPD)
Immediate forced expiratory volume in 1 s (FEV1) response to salbutamol did not predict the long-term benefits observed with indacaterol treatment in patients with COPD
Of the 195 (32.4%) patients who discontinued the study, 59 patients discontinued between Visit 1 and Visit 2 and did not receive indacaterol; and 136 patients discontinued between Visit 2 and Visit 3
Summary
The purpose of this study was to evaluate the correlation between immediate responsiveness with the short-acting β2-agonist salbutamol and effects of treatment with the ultra-long-acting β2-agonist indacaterol in patients with chronic obstructive pulmonary disease (COPD). Chronic obstructive pulmonary disease (COPD) is characterised by persistent airflow limitation that is usually progressive and can lead to dyspnoea and impaired quality of life [1, 2]. The Global Initiative for Chronic Obstructive Lung Diseases (GOLD) strategy recommends long-acting bronchodilators for maintenance treatment in patients with moderate-to-severe COPD, as they have been shown to improve lung function, dyspnoea, quality of life and exacerbation rate [2]. Published data further suggests that acute reversibility in response to bronchodilators in patients with COPD does not predict clinical outcomes [7, 8]
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