Long-acting antimuscarinic therapy in patients with chronic obstructive pulmonary disease receiving beta-blockers

BACKGROUND: Beta-blocker therapies for cardiovascular comorbidities are often withheld in patients with chronic obstructive pulmonary disease (COPD) due to potential adverse effects on airway obstruction. We carried out a post hoc analysis to determine the efficacy and safety of aclidinium in patients with moderate-to-very severe COPD and increased cardiovascular risk receiving beta-blockers at baseline versus non-users. METHODS: ASCENT-COPD was a Phase 4, multicenter, double-blind, randomized, placebo-controlled, parallel-group study. Patients were randomized 1:1 to aclidinium or placebo twice-daily for up to 3 years. Outcomes included risk of (time to first) major adverse cardiovascular events (MACE), all-cause mortality, and lung function over 3 years, and exacerbations over 1 year. RESULTS: Of 3589 patients, 1269 (35.4%) used beta-blockers and 2320 (64.6%) were non-users at baseline. Aclidinium did not statistically increase the risk of MACE (beta-blocker user: hazard ratio 1.01 [95% CI 0.62–1.64]; non-user: 0.80 [0.51–1.24]; interaction P = 0.48) or all-cause mortality (beta-blocker user: 1.13 [0.78–1.64]; non-user: 0.89 [0.62–1.26]; interaction P = 0.35), in patients using beta-blockers. Aclidinium reduced annualized rate of moderate-to-severe COPD exacerbation (beta-blocker user: rate ratio 0.75 [95% CI 0.60–0.94, P = 0.013]; non-user: 0.79 [0.67–0.93, P = 0.005]), delayed time to first exacerbation, and improved lung function versus placebo. There was greater trough FEV(1) benefit in beta-blocker users versus non-users (least squares mean difference at 52 weeks: 111 mL [95% CI 74 mL–147 mL] versus 69 mL [42 mL–97 mL]; interaction P = 0.041). CONCLUSIONS: This post hoc analysis supports long-acting anti-muscarinic use with concomitant beta-blockers in patients with moderate-to-very severe COPD and cardiovascular comorbidity. Trial registration: ClinicalTrials.gov, NCT01966107, Registered 16 October 2013, https://clinicaltrials.gov/ct2/show/NCT01966107.