Depressive Symptoms and Health-Related Quality of Life

TLDR

Little is known about how psychosocial versus physiological factors determine patient‑reported health status in chronic disease. This study compares the contributions of depressive symptoms and cardiac function measures to health status in patients with coronary artery disease. The authors measured depressive symptoms with the PHQ, cardiac function via echocardiography, treadmill testing, and stress echocardiography, and assessed health status outcomes with the Seattle Angina Questionnaire in 1024 stable CAD patients. Among the 1024 CAD patients, 20% had depressive symptoms, which were strongly associated with worse symptom burden, greater physical limitation, poorer quality of life, and overall health, whereas left‑ventricular ejection fraction and ischemia were not linked to health status.

Abstract

Little is known regarding the extent to which patient-reported health status, including symptom burden, physical limitation, and quality of life, is determined by psychosocial vs physiological factors among patients with chronic disease.To compare the contributions of depressive symptoms and measures of cardiac function to the health status of patients with coronary artery disease.Cross-sectional study of 1024 adults with stable coronary artery disease recruited from outpatient clinics in the San Francisco Bay Area between September 2000 and December 2002. Main Measures Measurement of depressive symptoms using the Patient Health Questionnaire (PHQ); assessment of cardiac function by measuring left ventricular ejection fraction on echocardiography, exercise capacity on treadmill testing, and ischemia on stress echocardiography; and measurement of a range of health status outcomes, including symptom burden, physical limitation, and quality of life, using the Seattle Angina Questionnaire. Participants were also asked to rate their overall health as excellent, very good, good, fair, or poor.Of the 1024 participants, 201 (20%) had depressive symptoms (PHQ score > or =10). Participants with depressive symptoms were more likely than those without depressive symptoms to report at least mild symptom burden (60% vs 33%; P<.001), mild physical limitation (73% vs 40%; P<.001), mildly diminished quality of life (67% vs 31%; P<.001), and fair or poor overall health (66% vs 30%; P<.001). In multivariate analyses adjusting for measures of cardiac function and other patient characteristics, depressive symptoms were strongly associated with greater symptom burden (odds ratio [OR], 1.8; 95% confidence interval [CI], 1.3-2.7; P =.002), greater physical limitation (OR, 3.1; 95% CI, 2.1-4.6; P<.001), worse quality of life (OR, 3.1; 95% CI, 2.2-4.6; P<.001), and worse overall health (OR, 2.0; 95% CI, 1.3-2.9; P<.001). Although decreased exercise capacity was associated with worse health status, left ventricular ejection fraction and ischemia were not.Among patients with coronary disease, depressive symptoms are strongly associated with patient-reported health status, including symptom burden, physical limitation, quality of life, and overall health. Conversely, 2 traditional measures of cardiac function-ejection fraction and ischemia-are not. Efforts to improve health status should include assessment and treatment of depressive symptoms.