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Microstructural White Matter Abnormalities and Cognitive Dysfunction in Subcortical Ischemic Vascular Disease: an

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Subcortical ischemic vascular disease (SIVD) is linked to white matter (WM) damage, impacting cognitive function. Diffusion tensor imaging (DTI) revealed widespread WM abnormalities and their correlation with cognitive decline in SIVD patients.

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Area of Science:

  • Neuroimaging
  • Neurology
  • Vascular Dementia Research

Background:

  • Subcortical ischemic vascular disease (SIVD) is increasingly recognized for its role in cognitive impairment.
  • White matter (WM) abnormalities are implicated in the pathogenesis of cognitive dysfunction in SIVD.
  • Diffusion tensor imaging (DTI) offers a method to detect WM microstructural changes.

Purpose of the Study:

  • To detect white matter (WM) damage using magnetic resonance diffusion tensor imaging (DTI) in subcortical ischemic vascular disease (SIVD) patients.
  • To investigate the correlations between DTI measures and cognitive dysfunction in SIVD.
  • To differentiate between SIVD patients with vascular cognitive impairment on dementia (VCIND) and normal cognition (NC).

Main Methods:

  • Fifty SIVD patients were divided into VCIND (22) and NC (28) groups.
  • Magnetic resonance diffusion tensor imaging (DTI) was performed on all participants.
  • Atlas-based analysis (ABA) was used to extract fractional anisotropy (FA) and mean diffusivity (MD) from supratentorial tracts, alongside neuropsychological assessments.

Main Results:

  • SIVD patients, particularly those in the VCIND group, exhibited decreased FA and increased MD across all major supratentorial white matter tracts (projection, association, and commissural fibers).
  • Montreal Cognitive Assessment (MoCA) scores showed significant correlations with DTI measures in all supratentorial WM tracts.
  • These findings indicate widespread white matter connectivity abnormalities in SIVD patients.

Conclusions:

  • Subcortical ischemic vascular disease (SIVD) is associated with significant white matter (WM) abnormalities affecting connectivity across all supratentorial regions.
  • The degree of white matter damage, as measured by DTI, directly correlates with the severity of cognitive dysfunction in SIVD patients.
  • DTI is a valuable tool for assessing WM integrity and its relationship to cognitive impairment in SIVD.