Accelerating rates of cognitive decline and imaging markers associated with β-amyloid pathology

Philip S. Insel, Niklas Mattsson, R. Scott Mackin, Michael Schöll, Rachel L. Nosheny, Duygu Tosun, Michael C. Donohue, Paul S. Aisen, William J. Jagust, Michael W. Weiner

Research output: Contribution to journalArticlepeer-review

36 Citations (SciVal)

Abstract

Objective: To estimate points along the spectrum of β-amyloid pathology at which rates of change of several measures of neuronal injury and cognitive decline begin to accelerate. Methods: In 460 patients with mild cognitive impairment (MCI), we estimated the points at which rates of florbetapir PET, fluorodeoxyglucose (FDG) PET, MRI, and cognitive and functional decline begin to accelerate with respect to baseline CSF Aβ 42. Points of initial acceleration in rates of decline were estimated using mixed-effects regression. Results: Rates of neuronal injury and cognitive and even functional decline accelerate substantially before the conventional threshold for amyloid positivity, with rates of florbetapir PET and FDG PET accelerating early. Temporal lobe atrophy rates also accelerate prior to the threshold, but not before the acceleration of cognitive and functional decline. Conclusions: A considerable proportion of patients with MCI would not meet inclusion criteria for a trial using the current threshold for amyloid positivity, even though on average, they are experiencing cognitive/functional decline associated with prethreshold levels of CSF Aβ 42. Future trials in early Alzheimer disease might consider revising the criteria regarding β-amyloid thresholds to include the range of amyloid associated with the first signs of accelerating rates of decline.

Original languageEnglish
Pages (from-to)1887-1896
Number of pages10
JournalNeurology
Volume86
Issue number20
DOIs
Publication statusPublished - 2016 May 17

Subject classification (UKÄ)

  • Neurology

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