Abstract:
:Universally accepted neuropathologic criteria for differentiating Alzheimer disease (AD) from healthy brain aging do not exist. We tested the hypothesis that Bielschowsky silver stained total, cored, and neuritic senile plaques (TSPs, CSPs, and NSPs, respectively), rather than neurofibrillary tangles (NFTs), best discriminate between the 2 conditions using rigorously defined nondemented (n = 7) and AD (n = 35) subjects with no known co-morbidities. We compared lesions in 3 neocortical regions, in hippocampal CA1, and in entorhinal cortex in 19 men and 13 women between 74 and 86 years at death. The Clinical Dementia Rating (CDR) was used to assess degree of cognitive impairment within a year of demise. Neocortical TSP measures provided the highest correlation with expiration CDR: area under the curve (AUC) = 0.986 with 97.8% sensitivity at 90% specificity with an estimated cut-point of 6.0 TSP/ mm2. All SP measures yielded higher estimated AUC and sensitivity for 90% specificity compared to NFTs. Derived TSP cut-points applied to 149 persons with clinical AD regardless of their neuropathologic diagnosis yielded a sensitivity of 97% and specificity of 84% for TSPs in the 3 neocortical areas. Thus cut-points based on both diffuse and neuritic SP in neocortical regions distinguished nondemented and AD subjects with high sensitivity and specificity.
journal_name
J Neuropathol Exp Neuroljournal_title
Journal of neuropathology and experimental neurologyauthors
McKeel DW Jr,Price JL,Miller JP,Grant EA,Xiong C,Berg L,Morris JCdoi
10.1093/jnen/63.10.1028subject
Has Abstractpub_date
2004-10-01 00:00:00pages
1028-37issue
10eissn
0022-3069issn
1554-6578journal_volume
63pub_type
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journal_title:Journal of neuropathology and experimental neurology
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