An Open Label Placebo Study To Assess The Inhalation Profile Obtained By Acoustic Monitoring In COPD Patients Using The NEXThaler DPI

As this is an exploratory study, a total of 70 to 80 completed patients, ensuring the following distribution in terms of COPD Stage as per GOLD 2013 (updated) spirometric classification of disease severity, are deemed to be sufficient for assessing the inhalation profile through the NEXThaler®: * 10 to 20 COPD GOLD Stage I patients * 20 patients in each of the COPD GOLD Stage II to IV. Assuming a screening failure/drop-out rate of 10%, a maximum of 89 patients will be screened in order to reach the required number of completed patients. All the analyses will be performed separately for the first and the second inhalation. Results stratified by disease severity and overall will be presented.