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Association between white matter lesions and the cerebral glucose metabolism in patients with cognitive impairment

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Author(s)
Hyun-Jung NoHyon-Ah YiKyoung Sook WonHyuk Won ChangHae Won Kim
Publication Year
2019
Keyword
White matter lesionSmall vessel diseaseAlzheimer's diseaseβ-Amyloid18F-FDG PET
Abstract
Aim
White matter lesions (WMLs), detected as hyperintensities on T2-weighted MRI, represent small vessel disease in the brain and are considered a potential risk factor for memory and cognitive impairment. It has not been sufficiently evident that cognitive impairment in patients with Alzheimer's disease is caused by WMLs as well as β-amyloid (Aβ) pathology. The aim of this study was to evaluate relationship between WMLs and cerebral glucose metabolism in patients with cognitive impairment after adjustment of cerebral Aβ burden.

Materials and methods
Eighty-three subjects with cognitive performance ranging from normal to dementia, who underwent brain MRI and 18F-florbetaben positron emission tomography (PET) and 18F-fluorodeoxyglucose PET, were included in this cross-sectional study. The Fazekas scale was used to quantify WMLs on brain T2-weighted MRI. The cerebral Aβ burden and cerebral glucose metabolism were quantitatively estimated using volume-of-interest analysis. Differences in the regional cerebral glucose metabolism were evaluated between low-WML (Fazekas scale < 2) and high-WML (Fazekas scale ≥ 2) groups. Multiple linear regression analysis adjusted for age, sex and cerebral Aβ burden was performed to evaluate the relationship between the Fazekas scale score and cerebral glucose metabolism.

Results
The regional cerebral glucose metabolism for the bilateral frontal, temporal, and parietal cortices, and limbic lobes in the high-WML group were significantly lower than those in the low-WML group. There were significant negative correlations between the Fazekas scale score and regional cerebral glucose metabolism in the bilateral frontal, bilateral temporal and left parietal cortices, and bilateral limbic lobes. Multiple linear regression analysis revealed that the Fazekas scale score was an independent determinant of the glucose metabolism in the bilateral frontal and temporal cortices and limbic lobes.

Conclusions
WMLs are associated with decreased cerebral glucose metabolism. Our findings suggest that small vessel disease, as well as Aβ pathology, may contribute to cognitive impairment in patients with Alzheimer's disease.
Department
Dept. of Neurology (신경과학)
Dept. of Nuclear Medicine (핵의학)
Publisher
School of Medicine (의과대학)
Citation
Revista Española de Medicina Nuclear e Imagen Molecular, Vol.38(3) : 160-166, 2019
Type
Article
ISSN
2253-8070
DOI
10.1016/j.remn.2018.12.001
URI
http://kumel.medlib.dsmc.or.kr/handle/2015.oak/42002
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