Document Type
Article
Abstract
Background
Cardiovascular risk factor burden in the absence of clinical or radiological “events” is associated with mild cognitive impairment. Magnetic resonance imaging techniques exploring the integrity of neuronal fiber connectivity within white matter networks supporting cognitive processing could be used to measure the impact of cardiovascular disease on brain health and be used beyond bedside neuropsychological tests to detect subclinical changes and select or stratify participants for entry into clinical trials.
Methods and Results
We assessed the relationship between verbal IQ and brain network integrity and the effect of cardiovascular risk factors on network integrity by constructing whole‐brain structural connectomes from magnetic resonance imaging diffusion images (N=60) from people with various degrees of cardiovascular risk factor burden. We measured axonal integrity by calculating network density and determined the effect of fiber loss on network topology and efficiency, using graph theory. Multivariate analyses were used to evaluate the relationship between cardiovascular risk factor burden, physical activity, age, education, white matter integrity, and verbal IQ. Reduced network density, resulting from a disproportionate loss of long‐range white matter fibers, was associated with white matter network fragmentation (r=−0.52, P<10−4), lower global efficiency (r=0.91, P<10−20), and decreased verbal IQ (adjusted R2=0.23, P<10−4).
Conclusions
Cardiovascular risk factors may mediate negative effects on brain health via loss of energy‐dependent long‐range white matter fibers, which in turn leads to disruption of the topological organization of the white matter networks, lowered efficiency, and reduced cognitive function.
Digital Object Identifier (DOI)
Publication Info
Published in Journal of the American Heart Association, Volume 7, Issue 23, 2018, pages e010054-.
APA Citation
Mehta, L. S., Velarde, G. P., Lewey, J., Sharma, G., Bond, R. M., Navas-Acien, A., Fretts, A. M., Magwood, G. S., Yang, E., Blumenthal, R. S., Brown, R.-M., & Mieres, J. H. (2023). Cardiovascular Disease Risk Factors in Women: The Impact of Race and Ethnicity: A Scientific Statement From the American Heart Association. Circulation, 147(19). https://doi.org/10.1161/CIR.0000000000001139
Rights
© 2018 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley. This is an open access article under the terms of the e Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.