Objective Assessment of Adherence to Inhalers by Patients with Chronic Obstructive Pulmonary Disease.

Rationale: Objective adherence to inhaled therapy by patients with chronic obstructive pulmonary disease (COPD) has not been reported.

Objectives: To objectively quantify adherence to preventer Diskus inhaler therapy by patients with COPD with an electronic audio recording device (INCA).

Methods: This was a prospective observational study.