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Research

Socioeconomic status and incidence of sudden cardiac arrest

Kyndaron Reinier, Elizabeth Thomas, Douglas L. Andrusiek, Tom P. Aufderheide, Steven C. Brooks, Clifton W. Callaway, Paul E. Pepe, Thomas D. Rea, Robert H. Schmicker, Christian Vaillancourt, Sumeet S. Chugh and the Resuscitation Outcomes Consortium Investigators
CMAJ October 18, 2011 183 (15) 1705-1712; DOI: https://doi.org/10.1503/cmaj.101512
Kyndaron Reinier
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Elizabeth Thomas
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Douglas L. Andrusiek
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Tom P. Aufderheide
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Steven C. Brooks
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Clifton W. Callaway
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Paul E. Pepe
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Thomas D. Rea
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Robert H. Schmicker
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Christian Vaillancourt
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Sumeet S. Chugh
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  • For correspondence: sumeet.chugh@cshs.org
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Abstract

Background: Low socioeconomic status is associated with poor cardiovascular health. We evaluated the association between socioeconomic status and the incidence of sudden cardiac arrest, a condition that accounts for a substantial proportion of cardiovascular-related deaths, in seven large North American urban populations.

Methods: Using a population-based registry, we collected data on out-of-hospital sudden cardiac arrests occurring at home or at a residential institution from Apr. 1, 2006, to Mar. 31, 2007. We limited the analysis to cardiac arrests in seven metropolitan areas in the United States (Dallas, Texas; Pittsburgh, Pennsylvania; Portland, Oregon; and Seattle–King County, Washington) and Canada (Ottawa and Toronto, Ontario; and Vancouver, British Columbia). Each incident was linked to a census tract; tracts were classified into quartiles of median household income.

Results: A total of 9235 sudden cardiac arrests were included in the analysis. For all sites combined, the incidence of sudden cardiac arrestin the lowest socioeconomic quartile was nearly double that in the highest quartile (incidence rate ratio [IRR] 1.9, 95% confidence interval [CI] 1.8–2.0). This disparity was greater among people less than 65 years old (IRR 2.7, 95% CI 2.5–3.0) than among those 65 or older (IRR 1.3, 95% CI 1.2–1.4). After adjustment for study site and for population age structure of each census tract, the disparity across socioeconomic quartiles for all ages combined was greater in the United States (IRR 2.0, 95% CI 1.9–2.2) than in Canada (IRR 1.8, 95% CI 1.6–2.0) (p < 0.001 for interaction).

Interpretation: The incidence of sudden cardiac arrest at home or at a residential institution was higher in poorer neighbourhoods of the US and Canadian sites studied, although the association was attenuated in Canada. The disparity across socioeconomic quartiles was greatest among people younger than 65. The association between socioeconomic status and incidence of sudden cardiac arrest merits consideration in the development of strategies to improve survival from sudden cardiac arrest, and possibly to identify opportunities for prevention.

See related commentary by Huikuri on page 1692 and at www.cmaj.ca/lookup/doi/10.1503/cmaj.111245

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Canadian Medical Association Journal: 183 (15)
CMAJ
Vol. 183, Issue 15
18 Oct 2011
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Socioeconomic status and incidence of sudden cardiac arrest
Kyndaron Reinier, Elizabeth Thomas, Douglas L. Andrusiek, Tom P. Aufderheide, Steven C. Brooks, Clifton W. Callaway, Paul E. Pepe, Thomas D. Rea, Robert H. Schmicker, Christian Vaillancourt, Sumeet S. Chugh, the Resuscitation Outcomes Consortium Investigators
CMAJ Oct 2011, 183 (15) 1705-1712; DOI: 10.1503/cmaj.101512

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Socioeconomic status and incidence of sudden cardiac arrest
Kyndaron Reinier, Elizabeth Thomas, Douglas L. Andrusiek, Tom P. Aufderheide, Steven C. Brooks, Clifton W. Callaway, Paul E. Pepe, Thomas D. Rea, Robert H. Schmicker, Christian Vaillancourt, Sumeet S. Chugh, the Resuscitation Outcomes Consortium Investigators
CMAJ Oct 2011, 183 (15) 1705-1712; DOI: 10.1503/cmaj.101512
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