Abstract:
OBJECTIVE:Since Alzheimer disease (AD) is a slowly progressive disorder and its pathologic features are likely to be present for many years before symptoms become manifest, we investigated whether microstructural white matter changes similar to those identified in patients with AD can be detected in cognitively normal individuals without dementia destined to develop amnestic mild cognitive impairment (aMCI). METHODS:We studied 193 cognitively normal individuals, of whom 173 remained cognitively stable (CN-stable) and 20 were diagnosed with aMCI (CN-aMCI converter) 2 years later. Structural MRI and diffusion tensor imaging were acquired at baseline to assess gray matter atrophy and microstructural white matter changes, respectively. RESULTS:At baseline, compared with CN-stable, CN-aMCI converters had substantial reductions in white matter integrity in the precuneus, parahippocampal cingulum, parahippocampal gyrus white matter, and fornix. Other diffuse white matter changes were observed in the frontal, parietal, and subcortical regions, whereas gray matter structures were relatively intact. The fractional anisotropy (FA) values of the precuneus were found to be a predictor of conversion from cognitively normal to aMCI. In addition, the FA values of the left parahippocampal gyrus white matter were predictive of subsequent episodic memory decline. CONCLUSIONS:Microstructural white matter changes are present in cognitively normal individuals in the pre-aMCI stage, and may serve as a potential imaging marker of early AD-related brain changes.
journal_name
Neurologyjournal_title
Neurologyauthors
Zhuang L,Sachdev PS,Trollor JN,Kochan NA,Reppermund S,Brodaty H,Wen Wdoi
10.1212/WNL.0b013e3182661f4dsubject
Has Abstractpub_date
2012-08-21 00:00:00pages
748-54issue
8eissn
0028-3878issn
1526-632Xpii
WNL.0b013e3182661f4djournal_volume
79pub_type
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