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Depression and heart disease: evidence of a link, and its therapeutic implications
Wei Jiang1, Ranga R K Krishnan, Christopher M O'Connor
1Department of Psychiatry, Duke University Medical Center, Durham, North Carolina 27707, USA.
Insights
Depression significantly increases the risk and mortality associated with heart disease, including coronary artery disease and heart failure. However, depressed cardiac patients are often undiagnosed, and treatment effectiveness remains unproven.
Area of Science:
- Cardiology
- Psychiatry
- Public Health
Background:
- Depressive disorder is a recognized risk factor for heart diseases, impacting both development (aetiology) and outcomes (prognosis).
- Numerous studies confirm a significant, independent link between depression and coronary artery disease (CAD), even after accounting for traditional risk factors.
Purpose of the Study:
- To synthesize evidence on the relationship between depression and cardiovascular disease.
- To highlight the prognostic implications of depression in patients with various heart conditions.
- To identify gaps in clinical recognition and treatment of depression in cardiac patients.
Main Methods:
- Review of large-scale prospective, longitudinal studies on depression and coronary artery disease.
- Analysis of prognostic studies examining mortality and morbidity in cardiac patients with and without depression.
- Assessment of existing evidence on antidepressant safety and treatment efficacy in this population.
Main Results:
- Depression is linked to a 2-3 times higher mortality rate post-myocardial infarction, unstable angina, or coronary artery bypass grafting.
- Depression worsens outcomes in stable CAD and heart failure patients, independent of other risk factors.
- Depressed cardiac patients are less frequently diagnosed than those with depression alone.
- Limited data suggests potential safety concerns with antidepressants in patients with CAD and heart failure.
Conclusions:
- Depression poses a significant adverse risk for cardiovascular disease aetiology and prognosis.
- There is a critical need for improved clinical recognition and management of depression in heart disease patients.
- Further research is essential to establish the safety and efficacy of antidepressant treatment for improving cardiac patient outcomes.
Abstract:
Over several decades, a large body of evidence has emerged to suggest that depressive disorder is a risk factor for heart diseases, both aetiologically and prognostically. Several large, prospective, longitudinal studies have examined the relationship between depression and the development of coronary artery disease (CAD); they reveal that the relationship is significant and independent of conventional risk factors. Prognostic studies have shown that depression is associated with two to three times higher mortality after myocardial infarction, unstable angina or coronary artery bypass grafting, and in patients with stable CAD compared with such patients without depression. Depression also has been found to increase mortality and morbidity in patients with heart failure, regardless of its aetiology. Such adverse associations persist after adjustment for conventional prognostic risk factors. Despite all of these findings, depressed patients with heart disease are less likely to be recognised clinically as being depressed than those patients who have depression but no heart disease. The very limited evidence available from pharmacological clinical trials raises concern about the safety of antidepressants in CAD and heart failure. In addition, no research has addressed whether the treatment of depression in patients with heart disease will improve their prognosis.