Cited by 32Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsNeurological Disease Mechanisms and Treatments

A third of community-dwelling elderly with intermediate and high level of Alzheimer’s neuropathologic changes are not demented: A meta-analysis

Azarpazhooh, Mahmoud Reza, Avan, Abolfazl, Cipriano, Lauren E., Munoz, David G., Erfanian, Mahdiyeh, Amiri, Amin, Stranges, Saverio, Hachinski, Vladimir·2020·Ageing Research Reviews

Abstract

This systematic review and meta-analysis assessed the bidirectional association between AD pathology and dementia in community-dwelling elderly populations. We searched PubMed/MEDLINE, Embase, Scopus, Web of Science, and references of the pertinent articles for community/population-based longitudinal cohorts with regular assessment of cognitive status of participants followed by postmortem neuropathology data, with no language and date restrictions, until 20 September 2019. Finally, we retrieved 18 articles with data from 17 cohorts comprising 4677 persons. Dementia was twice as likely in participants with definitive neuropathological indicator for AD compared to those without it: moderate/high Braak and Braak (BB) stages III-VI of neurofibrillary tangles (54 % vs. 26 % in participants with BB stages 0-II), the Consortium to Establish a Registry for AD (CERAD) moderate/frequent neuritic plaques scores (64 % vs. 33 % in participants with CERAD none/infrequent), and National Institute on Aging and the Reagan Institute of the Alzheimer's Association criteria intermediate/high AD probability (52 % vs. 28 % in participants with no/low AD probability). Accordingly, a substantial proportion of community-dwelling elderly people with definitive AD pathology may not develop dementia. Brain reserve or contribution of other factors and pathologies, such as vascular and degenerative pathology to dementia might explain this apparent discrepancy. These findings also suggest caution in equating Alzheimer pathology biomarkers with dementia.

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Crossref · 10.1016/j.arr.2019.101002

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Authors
Azarpazhooh, M. R., Avan, A., Cipriano, L. E., Munoz, D. G., Erfanian, M., Amiri, A., Stranges, S., & Hachinski, V.
Affiliations
  • Western University (CA)
  • Mashhad University of Medical Sciences (IR)
  • Ferdowsi University of Mashhad (IR)
Corresponding author
Hachinski, Vladimir
Venue
Ageing Research Reviews
Publisher
Elsevier BV
Published
2020-03
Volume
58
Pages
101002
ISSN
1568-1637 (ISSN-L)
OpenAlex
W2996885560
Cited by
32
References
63
Citations by year
2026: 6 · 2025: 4 · 2024: 9 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 4
FWCI
0.46
Type
journal article
Language
en
Open access
closed
Locations
  • Ageing Research Reviews (publishedVersion)
  • PubMed (publishedVersion)
  • Scholarship@Western (Western University) (submittedVersion)
Funders
  • Munich-Centre for Advanced Photonics
  • Orange County Community Foundation
  • City, University of London
  • Canadian Aeronautics and Space Institute
  • Singapore-MIT Alliance for Research and Technology Centre
  • ACT Government
  • National Institute on Aging
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
Alzheimer's disease, Alzheimer's disease pathology, dementia, community-dwelling older adults, neurofibrillary tangles, Braak stages, neuritic plaques, CERAD, brain reserve, postmortem neuropathology, cognitive status
MeSH terms
Neuropathology, Aged, Alzheimer Disease, Brain, Dementia, Humans, Neurofibrillary Tangles, Independent Living, Plaque, Amyloid

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