Lower microstructural integrity of brain white matter is related to higher mortality

Sanaz Sedaghat, Lotte G.M. Cremers, Marius De Groot, Albert Hofman, Aad Van Der Lugt, Wiro J. Niessen, Oscar H. Franco, Abbas Dehghan, M. Arfan Ikram, Meike W. Vernooij*

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Objective: To investigate the association of cerebral white matter microstructural integrity with mortality. Methods: We included 4,294 individuals, free from stroke and dementia (mean age 63.6 years, 44% male) from the population-based Rotterdam Study (2006-2011). Diffusion-MRI was used to assess the microstructural integrity of the white matter, both globally and for specific white matter tracts. Fractional anisotropy and mean diffusivity were the measures used to quantify white matter integrity. All-cause mortality and cause-specific mortality was recorded with a median follow-up time of 5.4 and 4.6 years, respectively. Cox regression models, adjusted for age, sex, APOE ϵ4 allele carriership, cardiovascular risk factors, and macrostructural MRI changes, were used to estimate hazard ratios. Results: During the follow-up time, 216 participants (5.0%) died of all causes, 31 (0.7%) of cardiovascular causes, and 102 individuals (2.4%) died of noncardiovascular causes. Each SD decrease in fractional anisotropy and each SD increase in mean diffusivity was associated with a 1.37-fold (95% confidence interval: 1.20-1.57) and a 1.49-fold (95% confidence interval: 1.28-1.75) higher hazard of all-cause mortality, respectively. The associations were more prominent with cardiovascular mortality than with noncardiovascular mortality. In tract-specific analyses, we observed that association tracts were more prominently related to mortality. Conclusions: Our findings suggest that impairments in cerebral white matter, even at early stages, are not limited to adverse brain outcomes and they are related to mortality, especially from cardiovascular causes.

Original languageEnglish (US)
Pages (from-to)927-934
Number of pages8
JournalNeurology
Volume87
Issue number9
DOIs
StatePublished - Aug 30 2016

ASJC Scopus subject areas

  • Clinical Neurology

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    Sedaghat, S., Cremers, L. G. M., De Groot, M., Hofman, A., Van Der Lugt, A., Niessen, W. J., Franco, O. H., Dehghan, A., Ikram, M. A., & Vernooij, M. W. (2016). Lower microstructural integrity of brain white matter is related to higher mortality. Neurology, 87(9), 927-934. https://doi.org/10.1212/WNL.0000000000003032