Subcortical volume changes in dementia with Lewy bodies and Alzheimer's disease. A comparison with healthy aging.

Abstract:

BACKGROUND:Differentiating Alzheimer's disease (AD) and dementia with Lewy bodies (DLB), two of the commonest forms of dementia in older age, remains a diagnostic challenge. To assist with better understanding of the differences between the conditions during life, we assessed limbic and subcortical brain volumes in AD, DLB, and healthy older individuals using magnetic resonance imaging (MRI), with the hypothesis that when compared with controls, subcortical volumes would be reduced to a greater extent in DLB than in AD. METHODS:One hundred participants (35 healthy controls, 32 AD, and 33 DLB) underwent 3 Tesla T1 weighted MR scanning. Volumes were automatically segmented for each participant using FreeSurfer, then expressed as a percentage of their total intracranial volumes. Group effects were assessed using multivariate analysis of covariance, controlling for age and gender. RESULTS:Significant group effects were apparent among subcortical brain volumes (F 28,162 = 4.8, p < 0.001; Wilk's Λ = 0.30, partial η 2 = 0.45), while univariate tests showed differences in all volumetric measures (p AD, p < 0.008). CONCLUSIONS:For similar levels of dementia severity, DLB appears to have greater involvement of subcortical brain atrophy than AD. Further investigation of the subcortical brain structures in DLB is warranted to fully understand their neurobiological role in this disease.

journal_name

Int Psychogeriatr

authors

Watson R,Colloby SJ,Blamire AM,O'Brien JT

doi

10.1017/S1041610215001805

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

529-36

issue

4

eissn

1041-6102

issn

1741-203X

pii

S1041610215001805

journal_volume

28

pub_type

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