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Coronary artery calcium, brain function and structure: the AGES-Reykjavik Study

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Authors
Vidal, Jean-Sébastien
Sigurdsson, Sigurdur
Jonsdottir, Maria K
Eiriksdottir, Gudny
Thorgeirsson, Gudmundur
Kjartansson, Olafur
Garcia, Melissa E
van Buchem, Mark A
Harris, Tamara B
Gudnason, Vilmundur
Launer, Lenore J
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Issue Date
2010-05-01

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Stroke. 2010, 41(5):891-7
Abstract
BACKGROUND AND PURPOSE: Several cardiovascular risk factors are associated with cognitive disorders in older persons. Little is known about the association of the burden of coronary atherosclerosis with brain structure and function. METHODS: This is a cross-sectional analysis of data from the Age, Gene, Environment Susceptibility (AGES)-Reykjavik Study cohort of men and women born 1907 to 1935. Coronary artery calcification (CAC), a marker of atherosclerotic burden, was measured with CT. Memory, speed of processing, and executive function composites were calculated from a cognitive test battery. Dementia was assessed in a multistep procedure and diagnosed according to international guidelines. Quantitative data on total intracranial and tissue volumes (total, gray matter volume, white matter volume, and white matter lesion volume), cerebral infarcts, and cerebral microbleeds were obtained with brain MRI. The association of CAC with dementia (n=165 cases) and cognitive function in nondemented subjects (n=4085), and separately with MRI outcomes, was examined in multivariate models adjusting for demographic and vascular risk factors. Analyses tested whether brain structure mediated the associations of CAC to cognitive function. RESULTS: Subjects with higher CAC were more likely to have dementia and lower cognitive scores, more likely to have lower white matter volume, gray matter volume, and total brain tissue, and to have more cerebral infarcts, cerebral microbleeds, and white matter lesions. The relations of cognitive performance and dementia to CAC were significantly attenuated when the models were adjusted for brain lesions and volumes. CONCLUSIONS: In a population-based sample, increasing atherosclerotic load assessed by CAC is associated with poorer cognitive performance and dementia, and these relations are mediated by evidence of brain pathology.
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http://dx.doi.org/10.1161/STROKEAHA.110.579581
ae974a485f413a2113503eed53cd6c53
10.1161/STROKEAHA.110.579581
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