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Grey-Matter Atrophy in Alzheimer's Disease is Asymmetric but not Lateralized.
MedLine Citation:
PMID:  21422522     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In Alzheimer's disease (AD), brain atrophy has been proposed to be left lateralized. Here, we reinvestigated the asymmetry and lateralization (i.e., asymmetry directed toward one hemisphere) of grey-matter (GM) distribution in 35 patients with AD, 24 patients with amnestic mild cognitive impairment (aMCI, a state of increased risk for AD), and 30 age-matched healthy controls (HC). We analyzed GM distribution by applying voxel-based morphometry (VBM) including analyses for asymmetry and lateralization. When comparing MCI with AD patients, VBM revealed GM loss in the entorhinal, temporoparietal, dorsofrontal, and occipital cortices as well as in the precuneus; when comparing HCs with MCI patients, we found similar differences, which were less pronounced especially within the temporoparietal cortex and precuneus. Analyses of regional asymmetry and regional lateralization as well as global lateralization did not yield significant results. However, lobar asymmetry of the temporal, parietal, and occipital lobes increased from HC to AD. Moreover, in aMCI and AD patients, performance of language-based neuropsychological tests correlated with lateralization of GM loss to the left hemisphere. We conclude that, in principle, brain atrophy in AD is asymmetric rather than lateralized. At the individual level however, asymmetry contributes to cognitive deficits.
Authors:
Sabine Derflinger; Christian Sorg; Christian Gaser; Nicholas Myers; Milan Arsic; Alexander Kurz; Claus Zimmer; Afra Wohlschläger; Mark Mühlau
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-18
Journal Detail:
Title:  Journal of Alzheimer's disease : JAD     Volume:  -     ISSN:  1875-8908     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9814863     Medline TA:  J Alzheimers Dis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Neurology, Technische Universität München, Munich, Germany.
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