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Stroke. 2020 Jan;51(1):69-74. doi: 10.1161/STROKEAHA.119.026698. Epub 2019 Dec 17.

Cholesterol Variability and Cranial Magnetic Resonance Imaging Findings in Older Adults: The Cardiovascular Health Study.

Author information

1
From the Department of Neurology (R.K., D.T.), University of Washington, Seattle.
2
Department of Biostatistics (T.M.B., K.R.), University of Washington, Seattle.
3
Initiative for Research and Education to Advance Community Health, Elson S. Floyd College of Medicine, Washington State University, Seattle (A.S.-D.).
4
Division of Stroke and Cerebrovascular Disease, Department of Neurology, Columbia University Medical Center, New York City, NY (M.S.V.E.).
5
Cardiovascular Health Research Unit and Departments of Medicine, Epidemiology, and Health Services (B.M.P.), University of Washington, Seattle.
6
Kaiser Permanente Washington Health Research Institute, Seattle, WA (B.M.P.).
7
Division of Stroke and Cerebrovascular Diseases, Department of Neurology, Tufts Medical Center, Boston, MA (L.Y.L.).
8
Departments of Neurology and Epidemiology (W.T.L.), University of Washington, Seattle.

Abstract

Background and Purpose- Serum cholesterol variability, independent of mean, has been associated with stroke, white matter hyperintensities on cranial magnetic resonance imaging (MRI), and other cardiovascular events. We sought to assess the relationship between total serum cholesterol (TC) variability and cranial MRI findings of subclinical or covert vascular brain injury in a longitudinal, population-based cohort study of older adults. Methods- In the Cardiovascular Health Study, we assessed associations between intraindividual TC mean, trend, and variability over ≈5 years with covert brain infarction (CBI) and white matter grade (WMG) on cranial MRI. Mean TC was calculated for each study participant from 4 annual TC measurements between 2 MRI scans. TC trend was calculated as the slope of the linear regression of the TC measurements, and TC variability was calculated as the SD of the residuals from the linear regression. We evaluated the association of intraindividual TC variability with incident CBI and worsening WMG between 2 MRI scans in primary analyses and with prevalent CBI number and WMG on the follow-up MRI scan in secondary analyses. Results- Among participants who were eligible for the study and free of clinical stroke before the follow-up MRI, 17.9% of 1098 had incident CBI, and 27.8% of 1351 had worsening WMG on the follow-up MRI. Mean, trend, and variability of TC were not associated with these outcomes. TC variability, independent of mean and trend, was significantly associated with the number of CBI (β=0.009 [95% CI, 0.003-0.016] P=0.004; N=1604) and was associated with WMG (β, 0.009 [95% CI, -0.0002 to 0.019] P=0.055; N=1602) on the follow-up MRI. Conclusions- Among older adults, TC variability was not associated with incident CBI or worsening WMG but was associated with the number of prevalent CBI on cranial MRI. More work is needed to validate and to clarify the mechanisms underlying such associations.

KEYWORDS:

brain; cholesterol; infarction; magnetic resonance imaging; white matter

PMID:
31842691
PMCID:
PMC7000173
[Available on 2021-01-01]
DOI:
10.1161/STROKEAHA.119.026698

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