Inspiratory Flow Rates Achieved by the COPD Patients Through Breezhaler®, Ellipta® and Handihaler® Inhaler Devices

Inclusion Criteria: \- Current or ex-smokers who have a smoking history of at least 10 pack years (e.g., 10 pack years = 1 pack/day × 10 years, ½ pack/day × 20 years, etc.). Note: A pack of cigarettes is equal to 20 cigarettes. Occasional smoking of cigars is not relevant to smoking history. An ex-smoker is defined as a patient who has not smoked for ≥6 months at screening. * COPD patients with moderate to very severe airflow limitation (spirometric classification: GOLD 2, 3 or 4) at time of screening, * Post-bronchodilator FEV1 \< 80% of the predicted normal, and * Post-bronchodilator FEV1/forced vital capacity (FVC) \<0.70. (Post-bronchodilator refers to 1 hour after sequential inhalation of 84 µg ipratropium bromide and 400 µg salbutamol) * Willing patients assessed as suitable by investigator to reproducibly perform inhalational manoeuvers through study devices as required by the standard protocol * Willing patients assessed as suitable by investigator to comprehend and follow the instructions for use of the inhalational devices to be tested in the study Exclusion Criteria: * Patients with a history of asthma or onset of respiratory symptoms prior to the age of 40 years * Use of short acting bronchodilating agent (SABA) as rescue (reliever) medication within 6 hours prior to or during inhalational profile assessments for the study \[Note: Use of rescue medication should not be restricted if patient feels the need of the rescue/ reliever medication because of th…