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Identification of Heterogeneous Subtypes of Mild Cognitive Impairment Using Cluster Analyses Based on PET Imaging of Tau and Astrogliosis

Authors
Lee, Hyun JeongLee, Eun-ChongSeo, SeonghoKo, Kwang-PilKang, Jae MyeongKim, Woo-RamSeo, Ha-EunLee, Sang-YoonLee, Yeong-BaePark, Kee HyungYeon, Byeong KilOkamura, NobuyukiNa, Duk L.Seong, Joon-KyungNoh, Young
Issue Date
26-1월-2021
Publisher
FRONTIERS MEDIA SA
Keywords
mild cognitive impairment; tau; THK; cluster analysis; positron emission tomography
Citation
FRONTIERS IN AGING NEUROSCIENCE, v.12
Indexed
SCIE
SCOPUS
Journal Title
FRONTIERS IN AGING NEUROSCIENCE
Volume
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/129347
DOI
10.3389/fnagi.2020.615467
ISSN
1663-4365
Abstract
Background: Mild cognitive impairment (MCI) is a condition with diverse causes and clinical outcomes that can be categorized into subtypes. [F-18]THK5351 has been known to detect reactive astrogliosis as well as tau which is accompanied by neurodegenerative changes. Here, we identified heterogeneous groups of MCI patients using THK retention patterns and a graph theory approach, allowing for the comparison of risk of progression to dementia in these MCI subgroups. Methods: Ninety-seven participants including 60 MCI patients and individuals with normal cognition (NC, n = 37) were included and undertook 3T MRI, [F-18]THK5351 PET, and detailed neuropsychological tests. [F-18]Flutemetamol PET was also performed in 62 participants. We calculated similarities between MCI patients using their regional standardized uptake value ratio of THK retention in 75 ROIs, and clustered subjects with similar retention patterns using the Louvain method based on the modularity of the graph. The clusters of patients identified were compared with an age-matched control group using a general linear model. Dementia conversion was evaluated after a median follow-up duration of 34.6 months. Results: MCI patients were categorized into four groups according to their THK retention patterns: (1) limbic type; (2) diffuse type; (3) sparse type; and (4) AD type (retention pattern as in AD). Subjects of the limbic type were characterized by older age, small hippocampal volumes, and reduced verbal memory and frontal/executive functions. Patients of the diffuse type had relatively large vascular burden, reduced memory capacity and some frontal/executive functions. Co-morbidity and mortality were more frequent in this subgroup. Subjects of the sparse type were younger and declined only in terms of visual memory and attention. No individuals in this subgroup converted to dementia. Patients in the AD type group exhibited the poorest cognitive function. They also had the smallest hippocampal volumes and the highest risk of progression to dementia (90.9%). Conclusion: Using cluster analyses with [F-18]THK5351 retention patterns, it is possible to identify clinically-distinct subgroups of MCI patients and those at greater risk of progression to dementia.
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