Psychological functioning is an important determinant of health outcomes in chronic lung disease. To better define the role of anxiety in COPD, we studied the inter-relations between anxiety and COPD in a large cohort of COPD subjects and a matched control group.
We used data from the FLOW (Function, Living, Outcomes, and Work) cohort (n=1,202) of COPD and matched controls (n=302) without COPD. Anxiety was measured using the Anxiety subscale of the Hospital Anxiety and Depression Scale.
COPD was associated with a greater risk of anxiety in multivariable analysis (OR 1.85; 95% CI 1.072 to 3.18). Among patients with COPD, anxiety was related to poorer health outcomes including worse submaximal exercise performance (less distance walked during the Six Minute Walk Test: -66.3 feet for anxious vs. non-anxious groups; 95% CI -127.3 to -5.36 feet) and a greater risk of self-reported functional limitations (OR 2.41; 95% CI 1.71 to 3.41). COPD subjects with anxiety had a higher longitudinal risk of COPD exacerbation in Cox proportional hazards analysis after controlling for covariates (HR 1.39; 95% CI 1.007 to 1.90).
COPD is associated with a higher risk of anxiety. Once anxiety develops among COPD patients, it is related to poorer health outcomes. Further research is needed to determine whether systematic screening and treatment of anxiety in COPD will improve health outcomes and prevent functional decline and disability.