Evidence map›Paper›PMID 34078163›Full record

ArticleJournal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism2021

Evidence of cerebral hemodynamic dysregulation in middle-aged APOE ε4 carriers: The PREVENT-Dementia study.

Maria-Eleni Dounavi, Audrey Low, Elizabeth F McKiernan, Elijah Mak, Graciela Muniz-Terrera, Karen Ritchie, Craig W Ritchie, Li Su, John T O'Brien

Abstract read
In one paragraph

Article in Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

25 citing papers in PubMed.

  1. Rapamycin increases cerebral blood flow and modulates metabolic, inflammatory, and microbiome profiles in healthy middle-aged APOE4 carriers: A pilot single-arm trial.Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2026
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  6. Hypothalamic volume, sleep, and APOE genotype in cognitively healthy adults.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025
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  13. Differential association of cerebral blood flow and anisocytosis in APOE ε4 carriers at midlife.Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2023
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Maria-Eleni DounaviDepartment of Psychiatry, School of Clinical Medicine, University of Cambridge, Cambridge, UK.ORCID 0000-0001-8287-346X
Audrey LowDepartment of Psychiatry, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
Elizabeth F McKiernanDepartment of Psychiatry, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
Elijah MakDepartment of Psychiatry, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
Graciela Muniz-TerreraCentre for Dementia Prevention, University of Edinburgh, Edinburgh, UK.
Karen RitchieCentre for Dementia Prevention, University of Edinburgh, Edinburgh, UK.
Craig W RitchieCentre for Dementia Prevention, University of Edinburgh, Edinburgh, UK.
Li SuDepartment of Psychiatry, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
John T O'BrienDepartment of Psychiatry, School of Clinical Medicine, University of Cambridge, Cambridge, UK.

Funding

Department of Health
6 · The paper itself

Abstract

Accumulating evidence suggests vascular dysregulation in preclinical Alzheimer's disease. In this study, cerebral hemodynamics and their coupling with cognition in middle-aged apolipoprotein ε4 carriers (APOEε4+) were investigated. Longitudinal 3 T T1-weighted and arterial spin labelling MRI data from 158 participants (40-59 years old) in the PREVENT-Dementia study were analysed (125 two-year follow-up). Cognition was evaluated using the COGNITO battery. Cerebral blood flow (CBF) and cerebrovascular resistance index (CVRi) were quantified for the flow territories of the anterior, middle and posterior cerebral arteries. CBF was corrected for underlying atrophy and individual hematocrit. Hemodynamic measures were the dependent variables in linear regression models, with age, sex, years of education and APOEε4 carriership as predictors. Further analyses were conducted with cognitive outcomes as dependent variables, using the same model as before with additional APOEε4 × hemodynamics interactions. At baseline, APOEε4+ showed increased CBF and decreased CVRi compared to non-carriers in the anterior and middle cerebral arteries, suggestive of potential vasodilation. Hemodynamic changes were similar between groups. Interaction analysis revealed positive associations between CBF changes and performance changes in delayed recall (for APOEε4 non-carriers) and verbal fluency (for APOEε4 carriers) cognitive tests. These observations are consistent with neurovascular dysregulation in middle-aged APOEε4+.

Indexed as

AdultAlzheimer DiseaseApolipoprotein E4AtrophyCase-Control StudiesCerebral ArteriesCerebrovascular CirculationCognitionFemaleFollow-Up StudiesHematocritHeterozygoteHumansLinear ModelsMagnetic Resonance ImagingMaleApolipoprotein E4APOEarterial spin labellingcerebral blood flowdementiaperfusion

Identifiers

PMID34078163
PMCPMC8543665

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.