White matter microstructural changes in pure Alzheimer's disease and subcortical vascular dementia.

Abstract:

BACKGROUND AND PURPOSE:Recent studies have demonstrated that Alzheimer's disease (AD) and subcortical vascular dementia (SVaD) have white matter (WM) microstructural changes. However, previous studies on AD and SVaD rarely eliminated the confounding effects of patients with mixed Alzheimer's and cerebrovascular disease pathologies. Therefore, our aim was to evaluate the divergent topography of WM microstructural changes in patients with pure AD and SVaD. METHODS:Patients who were clinically diagnosed with AD and SVaD were prospectively recruited. Forty AD patients who were Pittsburgh compound B (PiB) positive [PiB(+) AD] without WM hyperintensities and 32 SVaD patients who were PiB negative [PiB(-) SVaD] were chosen. Fifty-six cognitively normal individuals were also recruited (NC). Tract-based spatial statistics of diffuse tensor imaging were used to compare patterns of fractional anisotropy (FA) and mean diffusivity (MD). RESULTS:Compared with the NC group, the PiB(+) AD group showed decreased FA in the bilateral frontal, temporal and parietal WM regions and the genu and splenium of the corpus callosum as well as increased MD in the left frontal and temporal WM region. PiB(-) SVaD patients showed decreased FA and increased MD in all WM regions. Direct comparison between PiB(+) AD and PiB(-) SVaD groups showed that the PiB(-) SVaD group had decreased FA across all WM regions and increased MD in all WM regions except occipital regions. CONCLUSION:Our findings suggest that pure AD and pure SVaD have divergent topography of WM microstructural changes including normal appearing WM.

journal_name

Eur J Neurol

authors

Kim YJ,Kwon HK,Lee JM,Kim YJ,Kim HJ,Jung NY,Kim ST,Lee KH,Na DL,Seo SW

doi

10.1111/ene.12645

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

709-16

issue

4

eissn

1351-5101

issn

1468-1331

journal_volume

22

pub_type

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