Presymptomatic atrophy in autosomal dominant Alzheimer's disease: A serial magnetic resonance imaging study

Document Type

Journal Article

Publication Title

Alzheimer's & dementia: The Journal of the Alzheimer's Association

Publisher

Elsevier Inc

Place of Publication

United States

School

Centre of Excellence for Alzheimer's Disease Research and Care / School of Medical and Health Sciences

RAS ID

25408

Comments

Kinnunen, K. M., Cash, D. M., Poole, T., Frost, C., Benzinger, T. L., Ahsan, R. L., ... & Morris, J. C. (2018). Presymptomatic atrophy in autosomal dominant Alzheimer's disease: A serial magnetic resonance imaging study. Alzheimer's & dementia: the journal of the Alzheimer's Association, 14(1), 43-53. Available here.

Abstract

Introduction Identifying at what point atrophy rates first change in Alzheimer's disease is important for informing design of presymptomatic trials. Methods Serial T1-weighted magnetic resonance imaging scans of 94 participants (28 noncarriers, 66 carriers) from the Dominantly Inherited Alzheimer Network were used to measure brain, ventricular, and hippocampal atrophy rates. For each structure, nonlinear mixed-effects models estimated the change-points when atrophy rates deviate from normal and the rates of change before and after this point. Results Atrophy increased after the change-point, which occurred 1–1.5 years (assuming a single step change in atrophy rate) or 3–8 years (assuming gradual acceleration of atrophy) before expected symptom onset. At expected symptom onset, estimated atrophy rates were at least 3.6 times than those before the change-point. Discussion Atrophy rates are pathologically increased up to seven years before “expected onset”. During this period, atrophy rates may be useful for inclusion and tracking of disease progression.

DOI

10.1016/j.jalz.2017.06.2268

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