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Open Access Research article

The contribution of major depression to the global burden of ischemic heart disease: a comparative risk assessment

Fiona J Charlson12*, Andrew E Moran3, Greg Freedman4, Rosana E Norman25, Nicolas JC Stapelberg6, Amanda J Baxter12, Theo Vos4 and Harvey A Whiteford12

Author Affiliations

1 Queensland Centre for Mental Health Research, Brisbane, Australia

2 School of Population Health, University of Queensland, Brisbane, Australia

3 Division of General Medicine, Department of Medicine, Columbia University Medical Center, New York, USA

4 Institute for Health Metrics and Evaluation, University of Washington, Seattle, USA

5 Queensland Children’s Medical Research Institute, University of Queensland, Brisbane, Australia

6 School of Psychology, Griffith University, Brisbane, Australia

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BMC Medicine 2013, 11:250  doi:10.1186/1741-7015-11-250

Published: 26 November 2013

Abstract

Background

Cardiovascular disease and mental health both hold enormous public health importance, both ranking highly in results of the recent Global Burden of Disease Study 2010 (GBD 2010). For the first time, the GBD 2010 has systematically and quantitatively assessed major depression as an independent risk factor for the development of ischemic heart disease (IHD) using comparative risk assessment methodology.

Methods

A pooled relative risk (RR) was calculated from studies identified through a systematic review with strict inclusion criteria designed to provide evidence of independent risk factor status. Accepted case definitions of depression include diagnosis by a clinician or by non-clinician raters adhering to Diagnostic and Statistical Manual of Mental Disorders (DSM) or International Classification of Diseases (ICD) classifications. We therefore refer to the exposure in this paper as major depression as opposed to the DSM-IV category of major depressive disorder (MDD). The population attributable fraction (PAF) was calculated using the pooled RR estimate. Attributable burden was calculated by multiplying the PAF by the underlying burden of IHD estimated as part of GBD 2010.

Results

The pooled relative risk of developing IHD in those with major depression was 1.56 (95% CI 1.30 to 1.87). Globally there were almost 4 million estimated IHD disability-adjusted life years (DALYs), which can be attributed to major depression in 2010; 3.5 million years of life lost and 250,000 years of life lived with a disability. These findings highlight a previously underestimated mortality component of the burden of major depression. As a proportion of overall IHD burden, 2.95% (95% CI 1.48 to 4.46%) of IHD DALYs were estimated to be attributable to MDD in 2010. Eastern Europe and North Africa/Middle East demonstrate the highest proportion with Asia Pacific, high income representing the lowest.

Conclusions

The present work comprises the most robust systematic review of its kind to date. The key finding that major depression may be responsible for approximately 3% of global IHD DALYs warrants assessment for depression in patients at high risk of developing IHD or at risk of a repeat IHD event.

Keywords:
Depression; Ischemic heart disease; Comparative risk assessment; Burden of disease