Randomized Controlled Trial
Inhaled fentanyl citrate improves exercise endurance during high-intensity constant work rate cycle exercise in chronic obstructive pulmonary disease.
J Pain Symptom Manage. 2012 Apr 1;43(4):706-19.
Randomized Controlled Trial
Once-daily NVA237 improves exercise tolerance from the first dose in patients with COPD: the GLOW3 trial.
Int J Chron Obstruct Pulmon Dis. 2012 Jan 1;7:503-13.
Randomized Controlled Trial
Mechanisms of dyspnoea relief and improved exercise endurance after furosemide inhalation in COPD.
Thorax. 2008 Jul 1;63(7):606-13.