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Amyloid imaging and cognitive decline in nondemented oldest‐old: The 90+ Study
Author(s) -
Kawas Claudia H.,
Greenia Dana E.,
Bullain Szofia S.,
Clark Christopher M.,
Pontecorvo Michael J.,
Joshi Abhinay D.,
Corrada María M.
Publication year - 2013
Publication title -
alzheimer's and dementia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.713
H-Index - 118
eISSN - 1552-5279
pISSN - 1552-5260
DOI - 10.1016/j.jalz.2012.06.005
Subject(s) - neuropsychology , standardized uptake value , cognition , psychology , cognitive decline , effects of sleep deprivation on cognitive performance , positron emission tomography , amyloid (mycology) , alzheimer's disease , dementia , neuropsychological test , cognitive test , cognitive disorder , audiology , medicine , gerontology , neuroscience , pathology , cognitive impairment , disease
Background The goal of this study was to examine cross‐sectional and longitudinal associations between cognitive performance and beta amyloid (Aβ) load determined by florbetapir F18 positron emission tomography (PET) in nondemented oldest‐old. Methods Thirteen nondemented (normal or cognitively impaired nondemented) participants (median age, 94.2 years) from The 90+ Study underwent florbetapir‐PET scanning within 3 months of baseline neuropsychological testing. Amyloid load was measured with a semi‐automated quantitative analysis of average cortical‐to‐cerebellar standardized uptake value ratio (SUVr) and a visual interpretation (Aβ– or Aβ+). Neuropsychological testing was repeated every 6 months. Results At baseline, SUVr correlated significantly with tests of global cognition and memory. During follow‐up (median, 1.5 years), the Aβ+ group had steeper declines on most cognitive tests, particularly global cognitive measures. Conclusion This preliminary study suggests that greater amyloid load is associated with poorer cognition and faster cognitive decline in nondemented oldest‐old. Amyloid load may identify individuals at increased risk of developing Alzheimer's disease.