The Effect of QVA149 on Patient Reported Dyspnea in Moderate to Severe Chronic Obstructive Pulmonary Disease (COPD)

This study used a multi-center, randomized, blinded, double-dummy placebo controlled, three-period crossover design to assess the effect of once daily QVA149 q.d vs. placebo and tiotropium 18 μg q.d. in terms of patient reported dyspnea as assessed by Baseline Dyspnea Index (BDI)/Transient Dyspnea Index (TDI)(SAC version) in patients with moderate to severe COPD.