Age, Alzheimer disease, and brain structure

C. A. Raji, O. L. Lopez, L. H. Kuller, O. T. Carmichael, J. T. Becker

Research output: Contribution to journalArticle

120 Scopus citations

Abstract

BACKGROUND: Lack of clear understanding remains on the overlapping atrophy patterns of aging and early Alzheimer disease (AD) pathology in gray matter (GM) of the brain in vivo. OBJECTIVE: To evaluate the independent and overlapping patterns of GM atrophy in normal aging and AD. METHODS: A total of 169 cognitively normal subjects and 33 persons with probable AD enrolled in the longitudinal Cardiovascular Health Study-Cognition Study underwent 3-dimensional volumetric MRI scans. Controls remained cognitively normal for at least 5 years after their MRI scans and the probable AD subjects were relatively early in their clinical course with an average modified Mini-Mental State Examination score of 76/100. The scans were analyzed using voxel-based morphometry adjusting for total intracranial volume, gender, education, and race. RESULTS: With older age, GM volume was lower in the sensorimotor and heteromodal association areas in frontal, temporal, occipital, and parietal lobes, as well as in the cerebellum (false discovery rate p = 0.05). Additional atrophy was observed in the posterior hippocampus, thalamus, and middle cingulate gyrus. By contrast, atrophy was seen in subjects with AD in the anterior hippocampal/parahippocampal regions and the precuneus. Normal aging and AD overlapped in the hippocampal body and the entorhinal cortex. CONCLUSION Brain atrophy with aging was observed in supratentorial and infratentorial areas, as well in primary motor, sensory, and heteromodal association regions. Age and Alzheimer disease exert independent gray matter atrophy patterns but these effects overlapped substantially in the hippocampus and entorhinal cortex.

Original languageEnglish (US)
Pages (from-to)1899-1905
Number of pages7
JournalNeurology
Volume73
Issue number22
DOIs
StatePublished - Dec 2009

ASJC Scopus subject areas

  • Clinical Neurology

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    Raji, C. A., Lopez, O. L., Kuller, L. H., Carmichael, O. T., & Becker, J. T. (2009). Age, Alzheimer disease, and brain structure. Neurology, 73(22), 1899-1905. https://doi.org/10.1212/WNL.0b013e3181c3f293