Inclusion Criteria:

- Clinical diagnosis of COPD

- Age > 40 years old

- Documented spirometry within the last 12 months with a post-bronchodilator FEV1 <
80% of predicted and an FEV1 < 70% of FVC (4 puffs of salbutamol 30 minutes prior to
spirometry)

- Patients being hospitalized for an exacerbation at the University Hospitals of Leuven
at time of enrollment

- Patients currently treated with Spiriva for at least 4 weeks at the start of the data
collection (i.e. 4 weeks after hospitalization for an exacerbation)

- Oral fluency in Dutch

- Being capable to provide informed consent

Exclusion Criteria:

- A documented history of asthma or another respiratory disease

- An expected life expectancy of < 6 months

- Cognitive impairment (Mini Mental State Examination test results < 25) or presence of
other co-morbidities preventing patients from completing the self-report instruments
and/or using electronic monitoring

- Institutionalized patients, patients living in a nursing home or patients not
managing their medications independently