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Epidemiology of comorbid coronary artery disease and depression
Bruce Rudisch1, Charles B Nemeroff
1Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
Insights
Depression significantly increases the risk of cardiac events in patients with coronary artery disease and can independently contribute to developing heart disease. This review explores the epidemiology and risk factors of this comorbidity.
Area of Science:
- Cardiology
- Psychiatry
- Epidemiology
Background:
- Coronary artery disease (CAD) and unipolar depression frequently coexist.
- Depression, encompassing major depressive disorder and subsyndromal forms, affects a substantial portion of CAD patients.
- Subsyndromal depressive symptoms are more prevalent than major depression in CAD patients.
Purpose of the Study:
- To review the epidemiology of comorbid coronary artery disease and unipolar depression.
- To examine the impact of depression on cardiac event risk and CAD development.
- To investigate the influence of gender, age, and confounding factors on this relationship.
Main Methods:
- Literature review focusing on epidemiological studies of comorbid CAD and depression.
- Analysis of the increased risk of future cardiac events associated with depression in CAD patients.
- Evaluation of the relative risk of CAD development conferred by depression in individuals without prior cardiac disease.
Main Results:
- 17% to 27% of CAD patients experience major depression; a larger percentage has subsyndromal depressive symptoms.
- Depression doubles or triples the risk of future cardiac events in CAD patients, independent of cardiac function.
- Depression confers an approximate 1.5-fold increased risk for developing CAD in initially healthy individuals, independent of other risk factors.
Conclusions:
- Depression is a significant risk factor for both the development and adverse outcomes of coronary artery disease.
- Understanding the interplay of depression, gender, age, and other risk factors is crucial for managing comorbid conditions.
- Further research into mediating factors may reveal therapeutic targets for this high-risk population.
Abstract:
This article reviews the epidemiology of comorbid coronary artery disease and unipolar depression. Both major depression and subsyndromal depressive symptoms will be considered; unless otherwise specified, the term depression will be used to designate all depressive states, including major depressive disorder, minor depression, dysthymia, and other subsyndromal forms of depression. While 17% to 27% of patients with coronary artery disease have major depression, a significantly larger percentage has subsyndromal symptoms of depression. Patients with coronary artery disease and depression have a twofold to threefold increased risk of future cardiac events compared to patients without depression, independent of baseline cardiac dysfunction. The relative risk for the development of coronary artery disease conferred by depression in patients initially free of clinical cardiac disease is approximately 1.5, independent of other known risk factors for coronary disease. In the discussion, special attention will be paid to the interactions of both gender and age with depression and coronary artery disease risk. Scrutiny of the role of confounding risk factors is presented, such as global burden of comorbid medical illness and modification of traditional risk factors, which may, in part, mediate the effect of depression on coronary artery disease.