Incidence of depression and antidepressant prescription in patients with COPD: A large UK population-based cohort study.

Background: Depression is frequently reported in patients with Chronic Obstructive Pulmonary Disease (COPD). However, there is little information available on the incidence of depression following a COPD diagnosis.
Objective: To determine the incidence of a new diagnosis of depression or antidepressant prescription in people with and without a COPD diagnosis.
Methods: A matched cohort study was conducted using The Health Improvement Network database. Patients with confirmed COPD diagnosis were matched to up to four subjects without a COPD diagnosis by age, sex and GP practice. Cox proportional hazards models were used to assess the incidence rates of depression and antidepressant prescription.
Results: 44,362 patients with COPD and 124,140 subjects without COPD were included. The incidence rate of depression per 1000 person-years following COPD diagnosis was greater (11.4; 95% CI: 10.9-11.8) compared to subjects without COPD (5.7; 95% CI: 5.5-5.8) (p < 0.001). Patients with COPD were 42% more likely to have an incident depression (adjusted hazard ratio [aHR]: 1.42; 95% CI: 1.32-1.53; p < 0.001), and 40% more likely to be prescribed an antidepressant (aHR: 1.40; 95% CI: 1.35-1.45; p < 0.001). The incidence to either depression or antidepressant prescription was also greater for patients with COPD (aHR: 1.41; 95% CI: 1.36-1.46; p < 0.001). Patients with COPD and worse breathlessness had a higher risk of incident depression compared to patients with less breathlessness.
Conclusion: Healthcare providers managing patients with COPD should be alert to the existence of depression and aware of its symptoms and consequences.
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