Publications

The PREVENT Dementia Programme has a number of publications which have been published across a range of peer reviewed journals and can be accessed through the links in the categories below.

Imaging - View all [13]

Proximity to dementia onset and multi-modal neuroimaging changes: The prevent-dementia study.

Elijah Mak, Maria-Eleni Dounavi, Audrey Low, Stephen F Carter, Elizabeth McKiernan, Guy B Williams, Simon Jones, Isabelle Carriere, Graciela Muniz-Terrera, Karen Ritchie, Craig Ritchie, Li Su, John T O’Brien.

NeuroImage. 2021.

doi:https://doi.org/10.1016/j.neuroimage.2021.117749

Summary

First-degree relatives of people with dementia (FH+) are at increased risk of developing Alzheimer’s disease (AD). Here, we investigate “estimated years to onset of dementia” (EYO) as a surrogate marker of preclinical disease progression and assess its associations with multi-modal neuroimaging biomarkers. 89 FH+ participants in the PREVENT-Dementia study underwent longitudinal MR imaging over 2 years. EYO was calculated as the difference between the parental age of dementia diagnosis and the current age of the participant (mean EYO = 23.9 years). There were no significant effects of EYO on regional grey matter atrophy or white matter hyperintensities. However, a shorter EYO was associated with lower white matter Fractional Anisotropy and elevated Mean/Radial Diffusivity, particularly in the corpus callosum. The influence of EYO on white matter deficits were significantly stronger compared to that of normal ageing. APOE-ε4 carriers exhibited hyperperfusion with nearer proximity to estimated onset in temporo-parietal regions. There were no interactions between EYO and time, suggesting that EYO was not associated with accelerated imaging changes in this sample. Amongst cognitively normal midlife adults with a family history of dementia, a shorter hypothetical proximity to dementia onset may be associated with brain abnormalities, particularly amongst APOE-ε4 carriers. Our findings also confer biological validity to the construct of EYO as a potential stage marker of preclinical progression in the context of sporadic dementia. 

Cognition - View all [5]

Higher midlife CAIDE score is associated with increased brain atrophy in a cohort of cognitively healthy middle-aged individuals

Xulin Liu, Maria-Eleni Dounavi, Karen Ritchie, Katie Wells, Craig W. Ritchie, Li Su, Graciela Muniz-Terrera & John T. O’Brien

Journal of Neurology. 2021

DOI: https://doi.org/10.1007/s00415-020-10383-8

Summary
Cardiovascular factors have a strong association with Alzheimer’s disease (AD) and brain atrophy. However, until recently, there has been limited longitudinal research in cognitive healthy middle-aged adults investigating these links. A recent PREVENT Dementia study used data from 167 participants in the PREVENT London cohort, to investigate associations between the CAIDE (Cardiovascular Risk Factors, Aging, and Dementia) score and structural MRI scans at both baseline and 2-year follow up. Participants in the high-risk group (i.e., those with a CAIDE score above 6) were on average, found to have a greater rate of brain atrophy. However, to identify the specific regions and structures driving this atrophy pattern, additional analysis was conducted using voxel based morphometry (VBM).

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Other - View all [7]

Trauma and depressive symptomatology in middle-aged persons at high risk of dementia: the PREVENT Dementia Study

Trauma and depressive symptomatology in middle-aged persons at high risk of dementia: the PREVENT Dementia Study 

Karen Ritchie,  Isabelle Carrière, Sarah Gregory, Tam Watermeyer, Samuel Danso, Li Su, Craig W Ritchie, John T O’Brien

Journal of Neurology, Neurosurgery and Psychiatry. 2020

DOI: http://dx.doi.org/10.1136/jnnp-2020-323823

Summary 

This study explored the links between childhood trauma, depression, adult cognitive functioning and risk of dementia.

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