Cardiovascular risk factors are associated with cognitive impairments. However, the effects of cardiovascular risk factors on the topography of cortical thinning have not yet been studied in patients with mild cognitive impairment (MCI) or dementia. Thus, we aimed to evaluate the topography of cortical thinning related to cardiovascular risk factors and the relationships among cardiovascular risk factors, white matter hyperintensities (WMH), and cortical atrophy. Participants included 226 patients with Alzheimer disease or subcortical vascular dementia and 135 patients with amnestic MCI or subcortical vascular MCI. We automatically measured the volume of WMH and cortical thickness. Hypertension was associated with cortical thinning in the frontal and perisylvian regions, and cortical thinning related to diabetes mellitus (DM) occurred in the frontal region. In path analyses, hypertension accounted for 0.04 of the frontal thinning with the mediation of WMH and 0.16 without the mediation of WMH. In case of DM, it accounted for 0.02 of the frontal thinning with the mediation of WMH and 0.13 without the mediation of WMH. Hypertension and DM predominantly affected frontal thinning both with and without the mediation of WMH, where the effects without the mediation of WMH were greater than those with the mediation of WMH.
*Department of Neurology, Sungkyunkwan University School of Medicine, Samsung Medical Center
†Department of Biomedical Engineering, Hanyang University
§Department of Neurology, Konkuk University Hospital, Konkuk University School of Medicine
∥Department of Radiology, Sungkyunkwan University School of Medicine
¶Biostatistics team, Samsung Biomedical Research Institute, Samsung Medical Center
#Department of Neurology, Seoul National University Boramae Hospital
**Department of Neurology, National Health Insurance Corporation Ilsan Hospital, Goyang, Republic of Korea
‡‡Department of Social and Preventive Medicine, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea
††Department of Neurology, Washington University School of Medicine, St Louis, MO
‡Division of Newborn Medicine, Children’s Hospital Boston, Harvard Medical School, MA
This study was supported by a grant from the Korean Healthcare Technology R&D Project, Ministry for Health, Welfare & Family Affairs, Republic of Korea (A050079), a Korean Science and Engineering Foundation (KOSEF) NRL Program Grant funded by the Korean government (MEST; R0A-2007-000-20068-0), and a Samsung Medical Center Clinical Research Development Program Grant (CRL-108011 & CRS 110-14-1).
The authors declare no conflict of interest.
This study was approved by the Institutional Review Board of the Samsung Medical Center.
Reprints: Duk L. Na, MD, Department of Neurology, Sungkyunkwan University, Samsung Medical Center, 50 Ilwon-dong, Kangnam-ku, Seoul 135-710, Korea (e-mail: firstname.lastname@example.org).
Received February 23, 2011
Accepted May 31, 2011