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Published on: December 2, 2014
Associations of Arterial Stiffness With Cognitive Performance, and the Role of Microvascular Dysfunction: The
Sytze P Rensma1,2, Coen D A Stehouwer1,2, Martin P J Van Boxtel3,4
1From the CARIM School for Cardiovascular Diseases (S.P.R., C.D.A.S., A.J.H.M.H., C.G.S., A.A.K., R.M.A.H., P.C.D., S.J.P.M.E., K.D.R., M.T.S., T.T.v.S.).
Abstract:
The mechanisms underlying cognitive impairment are incompletely understood but may include arterial stiffness and microvascular dysfunction. In the population-based Maastricht Study, we investigated the association between arterial stiffness and cognitive performance, and whether any such association was mediated by microvascular dysfunction. We included cross-sectional data of 2544 participants (age, 59.7 years; 51.0% men; 26.0% type 2 diabetes mellitus). We used carotid-femoral pulse wave velocity and carotid distensibility coefficient as measures of aortic and carotid stiffness, respectively. We calculated a composite score of microvascular dysfunction based on magnetic resonance imaging features of cerebral small vessel disease, flicker light-induced retinal arteriolar and venular dilation response, albuminuria, and plasma biomarkers of microvascular dysfunction (sICAM-1 [soluble intercellular adhesion molecule-1], sVCAM-1 [soluble vascular adhesion molecule-1], sE-selectin [soluble E-selectin], and vWF [von Willebrand factor]). Cognitive domains assessed were memory, processing speed, and executive function. A cognitive function score was calculated as the average of these domains. Higher aortic stiffness (per m/s) was associated with lower cognitive function (β, -0.018 SD [95% CI, -0.036 to -0.000]) independent of age, sex, education, and cardiovascular risk factors, but higher carotid stiffness was not. Higher aortic stiffness (per m/s) was associated with a higher microvascular dysfunction score (β, 0.034 SD [95% CI, 0.014 to 0.053]), and a higher microvascular dysfunction score (per SD) was associated with lower cognitive function (β, -0.089 SD [95% CI, -0.124 to -0.053]). Microvascular dysfunction significantly explained 16.2% of the total effect of aortic stiffness on cognitive function. The present study showed that aortic stiffness, but not carotid stiffness, is independently associated with worse cognitive performance, and that this association is in part explained by microvascular dysfunction.
Insights
Stiffening of the aorta, not the carotid artery, is linked to poorer cognitive function. This link is partly explained by impaired microvascular function, highlighting its role in cognitive health.
Area of Science:
- Cardiovascular Health
- Neuroscience
- Aging Research
Background:
- Cognitive impairment mechanisms are unclear, but arterial stiffness and microvascular dysfunction are implicated.
- Understanding these links is crucial for developing interventions to maintain cognitive function.
Purpose of the Study:
- To investigate the association between arterial stiffness and cognitive performance.
- To determine if microvascular dysfunction mediates the relationship between arterial stiffness and cognitive function.
Main Methods:
- Cross-sectional analysis of 2544 participants from The Maastricht Study.
- Assessed aortic and carotid stiffness using pulse wave velocity and distensibility.
- Measured microvascular dysfunction via cerebral small vessel disease, retinal vasodilation, albuminuria, and plasma biomarkers.
Main Results:
- Higher aortic stiffness correlated with lower cognitive function, independent of risk factors.
- Higher aortic stiffness was associated with increased microvascular dysfunction.
- Microvascular dysfunction partially mediated the effect of aortic stiffness on cognitive function, explaining 16.2% of the association.
Conclusions:
- Aortic stiffness, not carotid stiffness, is independently associated with worse cognitive performance.
- Microvascular dysfunction plays a significant role in the pathway linking aortic stiffness to cognitive decline.
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