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Depression as a risk factor for cardiac mortality and morbidity: a review of potential mechanisms
Robert M Carney1, Kenneth E Freedland, Gregory E Miller
1Department of Psychiatry, Suite 420, Behavioral Medicine Center, Washington University School of Medicine, 4625 Lindell Boulevard, St Louis, MO 63108, USA.
Insights
Depression significantly elevates the risk of cardiac events and death in patients with coronary heart disease (CHD). This review explores potential mechanisms linking depression to increased cardiac morbidity and mortality.
Area of Science:
- Cardiology
- Psychiatry
- Public Health
Background:
- Depression is a known risk factor for adverse cardiac outcomes in patients with coronary heart disease (CHD).
- The precise biological and behavioral pathways connecting depression to cardiac mortality and morbidity are not fully understood.
Purpose of the Study:
- To review and synthesize evidence on the mechanisms linking depression to increased risk of incident coronary disease.
- To explore how depression contributes to subsequent cardiac morbidity and mortality in patients with existing CHD.
Main Methods:
- Literature review of behavioral and physiological mechanisms.
- Examination of factors including antidepressant effects, cardiac risk factors, disease severity, treatment adherence, heart rate variability (HRV), platelet aggregation, and inflammation.
Main Results:
- Depression is associated with increased cardiac risk factors (smoking, hypertension, diabetes) and greater coronary disease severity.
- Potential mechanisms include antidepressant cardiotoxicity, nonadherence to treatment, altered cardiac autonomic tone (lower HRV), increased platelet aggregation, and inflammatory processes.
Conclusions:
- Several behavioral and physiological pathways may explain the link between depression and increased cardiac risk.
- Further research is essential to elucidate the exact mechanisms and inform clinical practice for managing cardiac patients with depression.
Abstract:
Depression increases the risk of cardiac mortality and morbidity in patients with coronary heart disease (CHD), but the mechanisms that underlie this association remain unclear. This review considers the evidence for several behavioral and physiological mechanisms that might explain how depression increases the risk for incident coronary disease and for subsequent cardiac morbidity and mortality. The candidate mechanisms include: (1). antidepressant cardiotoxicity; (2). association of depression with cardiac risk factors such as cigarette smoking, hypertension, diabetes, and reduced functional capacity; (3). association of depression with greater coronary disease severity; (4). nonadherence to cardiac prevention and treatment regimens; (5). lower heart rate variability (HRV) reflecting altered cardiac autonomic tone; (6). increased platelet aggregation; and (7). inflammatory processes. Despite recent advances in our understanding of these potential mechanisms, further research is needed to determine how depression increases risk for cardiac morbidity and mortality.