Brain Volume as an Integrated Marker for the Risk of Death in a Community-Based Sample: Age Gene/Environment Susceptibility-Reykjavik Study

Saskia S G C Van Elderen, Qian Zhang, Sigudur Sigurdsson, Thaddeus J. Haight, Oscar Lopez, Gudny Eiriksdottir, Palmi Jonsson, Laura De Jong, Tamara B. Harris, Melissa Garcia, Vilmundar Gudnason, Mark A. Van Buchem, Lenore J. Launer

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Abstract

Background. Total brain volume is an integrated measure of health and may be an independent indicator of mortality risk independent of any one clinical or subclinical disease state. We investigate the association of brain volume to total and cause-specific mortality in a large nondemented stroke-free community-based cohort. Methods. The analysis includes 3,543 men and women (born 1907-1935) participating in the Age, Gene, Environment Susceptibility-Reykjavik Study. Participants with a known brain-related high risk for mortality (cognitive impairment or stroke) were excluded from these analyses. Quantitative estimates of total brain volume, white matter, white matter lesions, total gray matter (GM; cortical GM and subcortical GM separately), and focal cerebral vascular disease were generated from brain magnetic resonance imaging. Brain atrophy was expressed as brain tissue volume divided by total intracranial volume, yielding a percentage. Mean follow-up duration was 7.2 (0-10) years, with 647 deaths. Cox regression was used to analyze the association of mortality to brain atrophy, adjusting for demographics, cardiovascular risk factors, and cerebral vascular disease. Results. Reduced risk of mortality was significantly associated with higher total brain volume (hazard ratio, 95% confidence interval = 0.71, 0.65-0.78), white matter (0.85, 0.78-0.93), total GM (0.74, 0.68-0.81), and cortical GM (0.78, 0.70-0.87). Overall, the associations were similar for cardiovascular and noncardiovascular-related deaths. Conclusions. Independent of multiple risk factors and cerebral vascular damage, global brain volume predicts mortality in a large nondemented stroke-free community-dwelling older cohort. Total brain volume may be an integrated measure reflecting a range of health and with further investigation could be a useful clinical tool when assessing risk for mortality.

Original languageEnglish
Pages (from-to)131-137
Number of pages7
JournalJournals of Gerontology - Series A Biological Sciences and Medical Sciences
Volume71
Issue number1
DOIs
Publication statusPublished - 15 Jul 2015
Externally publishedYes

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Keywords

  • Brain aging
  • Epidemiology
  • Mortality risking
  • Neuroimaging

ASJC Scopus subject areas

  • Ageing
  • Geriatrics and Gerontology

Cite this

Van Elderen, S. S. G. C., Zhang, Q., Sigurdsson, S., Haight, T. J., Lopez, O., Eiriksdottir, G., Jonsson, P., De Jong, L., Harris, T. B., Garcia, M., Gudnason, V., Van Buchem, M. A., & Launer, L. J. (2015). Brain Volume as an Integrated Marker for the Risk of Death in a Community-Based Sample: Age Gene/Environment Susceptibility-Reykjavik Study. Journals of Gerontology - Series A Biological Sciences and Medical Sciences, 71(1), 131-137. https://doi.org/10.1093/gerona/glu192