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Multiple or mixed cerebral microbleeds and dementia in patients with vascular risk factors

Kaori Miwa1, Makiko Tanaka2, Shuhei Okazaki2

  • 1From the Department of Neurology and Stroke Center (K.M., M.T., S.O., Y.Y., M.S., H.M.), Osaka University Graduate School of Medicine; and Department of Neurology (K.K.), Tokyo Women's Medical University, Japan. miwa@osaka-njm.net kkitagawa@nij.twmu.ac.jp.

Neurology
|July 13, 2014
PubMed
Abstract

Insights

Multiple cerebral microbleeds (CMBs) or mixed CMBs significantly increase dementia risk in patients with vascular risk factors. Strictly lobar CMBs did not show this association, suggesting vascular burden mediates the risk.

Area of Science:

  • Neurology
  • Gerontology
  • Vascular Medicine

Background:

  • Cerebral microbleeds (CMBs) are small hemorrhages in the brain often associated with aging and vascular risk factors.
  • The independent association between CMBs and the risk of developing dementia remains incompletely understood, particularly in specific patient populations.

Purpose of the Study:

  • To determine if cerebral microbleeds (CMBs) are independently associated with the incidence of dementia in individuals with existing vascular risk factors.
  • To explore whether the location and number of CMBs influence their association with dementia risk.

Main Methods:

  • A Japanese observational cohort study initiated in 2001 included participants with vascular risk factors.
  • Baseline brain MRI assessed small vessel disease (CMBs, lacunar infarcts, white matter hyperintensities) and atrophy.
  • Cox proportional hazards models analyzed predictors of incident dementia, adjusting for clinical and radiological variables.

Main Results:

  • Of 524 participants, 44 developed incident dementia over a median 7.5-year follow-up.
  • Overall presence of CMBs was not significantly associated with all-cause dementia risk (p = 0.15).
  • However, multiple CMBs (≥ 2) or mixed lobar and deep CMBs were significantly associated with increased all-cause dementia risk, while strictly lobar CMBs showed no association.

Conclusions:

  • The presence of multiple or mixed cerebral microbleeds (CMBs) independently predicts a higher risk of all-cause dementia.
  • These findings support the hypothesis that CMBs contribute to dementia development, potentially through mechanisms related to overall vascular burden.

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