title: Amyloid imaging and cognitive decline in nondemented oldest-old: the 90+ Study.
abstract: 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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Neurology, University of California, Irvine, Irvine, CA, USA. ckawas@uci.edu
authors.forename: Claudia H
authors.initials: CH
authors.lastname: Kawas
authors.forename: Dana E
authors.initials: DE
authors.lastname: Greenia
authors.forename: Szofia S
authors.initials: SS
authors.lastname: Bullain
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Clark
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Pontecorvo
authors.forename: Abhinay D
authors.initials: AD
authors.lastname: Joshi
authors.forename: María M
authors.initials: MM
authors.lastname: Corrada
mesh_terms: D000369:Aged, 80 and over; D000682:Amyloid / Q000032:analysis* / Q000378:metabolism; D001921:Brain / Q000000981:diagnostic imaging* / Q000378:metabolism; D003072:Cognition Disorders / Q000000981:diagnostic imaging* / Q000378:metabolism; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D049268:Positron-Emission Tomography
chemical_list: D000682:Amyloid