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Published in: European Journal of Applied Physiology 8/2022

Open Access 06-05-2022 | Dementia | Original Article

Cerebrovascular function and its association with systemic artery function and stiffness in older adults with and without mild cognitive impairment

Authors: Tom G. Bailey, Timo Klein, Annelise L. Meneses, Kayla B. Stefanidis, Stefanie Ruediger, Daniel J. Green, Tim Stuckenschneider, Stefan Schneider, Christopher D. Askew

Published in: European Journal of Applied Physiology | Issue 8/2022

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Abstract

Purpose

Our aim was to compare cerebrovascular and systemic vascular function between older adults with and without mild cognitive impairment (MCI), and to determine which measures of vascular function best predict the presence of MCI.

Methods

In 41 adults with MCI and 33 adults without MCI (control) we compared middle cerebral artery velocity (MCAv) and cerebrovascular pulsatility index (PI) at rest, cerebrovascular reactivity to CO2, and responsiveness to changes in blood pressure (%∆MCAv/%∆MAP). Systemic vascular function was assessed by flow-mediated dilation (FMD) and stiffness by pulse wave velocity (PWV).

Results

Cerebrovascular PI was higher in MCI compared with control (mean ± SD: 1.17 ± 0.27 vs. 1.04 ± 0.21), and MCI exhibited a lower %∆MCAv/%∆MAP (1.26 ± 0.44 vs. 1.50 ± 0.55%). Absolute (p = 0.76) and relative cerebrovascular reactivity to CO2 (p = 0.34) was similar between MCI and control. When age was included as a covariate the significant difference in cerebral PI between groups was lost. PWV was higher (13.2 ± 2.2 vs. 11.3 ± 2.5 m s−1) and FMD% (4.41 ± 1.70 vs. 5.43 ± 2.15%) was lower in MCI compared with control. FMD% was positively associated with PI across the cohort. Logistic regression analysis indicated that FMD and PWV significantly discriminated between MCI and controls, independent of age, whereas the inclusion of cerebrovascular measures did not improve the predictive accuracy of the model.

Conclusion

These findings raise the possibility that early changes in systemic vascular stiffness and endothelial function may contribute to altered cerebrovascular haemodynamics and impaired cognitive function, and present potential targets for prevention and treatment strategies in people with MCI.
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Metadata
Title
Cerebrovascular function and its association with systemic artery function and stiffness in older adults with and without mild cognitive impairment
Authors
Tom G. Bailey
Timo Klein
Annelise L. Meneses
Kayla B. Stefanidis
Stefanie Ruediger
Daniel J. Green
Tim Stuckenschneider
Stefan Schneider
Christopher D. Askew
Publication date
06-05-2022
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Applied Physiology / Issue 8/2022
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-022-04956-w

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