Background: Adherence to pharmacological treatment is a fundamental factor in the control of chronic respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD). Poor disease control is associated with increased morbidity and mortality and higher health costs. Methods: A multicenter, observational cross-sectional study was performed. Four hundred patients with a diagnosis of asthma or COPD were recruited from 18 Spanish hospitals. A total of 15 different inhalation devices used in the treatment of these diseases and grouped depending on their characteristics were analyzed. Patients underwent a clinical interview, and questionnaires were completed on inhaler adherence, satisfaction, and disease control. Results: Satisfaction was lower when adherence was intermediate or poor than when it was good (good vs. intermediate p = 0.035; poor vs. good p = 0.009). Multivariate analyses of feeling of satisfaction with inhaler (FSI) showed statistically significant effects for the level of adherence and academic degree in both chronic respiratory diseases and for the Asthma Control Test in the case of asthma, but not for COPD. Conclusions: High degree of satisfaction with the inhalers was observed in asthma and COPD patients, with no difference among device types. A positive association was found between satisfaction and both adherence and the degree of disease control in asthma, but not in COPD. Nevertheless, further investigations are needed to better clarify these associations.
Keywords: COPD; adherence; asthma; disease control; inhaler; inhaler satisfaction.