Complexity changes in preclinical Alzheimer's disease: An MEG study of subjective cognitive decline and mild cognitive impairment

被引:20
作者
Shumbayawonda, Elizabeth [1 ]
Lopez-Sanz, David [2 ,3 ]
Bruna, Ricardo [2 ,3 ,4 ]
Serrano, Noelia [2 ,3 ]
Fernandez, Alberto [2 ,5 ]
Maestu, Fernando [2 ,3 ,4 ]
Abasolo, Daniel [1 ]
机构
[1] Univ Surrey, Fac Engn & Phys Sci, Ctr Biomed Engn, Dept Mech Engn Sci, Guildford GU2 7XH, Surrey, England
[2] Tech Univ Madrid UPM, Ctr Biomed Technol CTB, Lab Cognit & Computat Neurosci UCM UPM, Madrid, Spain
[3] Univ Complutense Madrid, Dept Expt Psychol, Madrid, Spain
[4] Biomed Res Networking Ctr Bioengn Biomat & Nanome, Zaragoza, Spain
[5] Univ Complutense Madrid, Dept Med Legal Psiquiatria & Patol, Madrid, Spain
关键词
Lempel-Ziv complexity; Magnetoencephalogram; Subjective cognitive decline; Mild cognitive impairment; Source space; Alzheimer's disease; LEMPEL-ZIV COMPLEXITY; FUNCTIONAL CONNECTIVITY; HIPPOCAMPAL ATROPHY; BRAIN ACTIVITY; EEG SIGNALS; MEMORY; CONVERSION; PRECUNEUS; NETWORK; BETA;
D O I
10.1016/j.clinph.2019.11.023
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Objective: To analyse magnetoencephalogram (MEG) signals with Lempel-Ziv Complexity (LZC) to identify the regions of the brain showing changes related to cognitive decline and Alzheimefs Disease (AD). Methods: LZC was used to study MEG signals in the source space from 99 participants (36 male, 63 female, average age: 71.82 +/- 4.06) in three groups (33 subjects per group): healthy (control) older adults, older adults with subjective cognitive decline (SCD), and adults with mild cognitive impairment (MCI). Analyses were performed in broadband (2-45 Hz) and in classic narrow bands (theta (4-8 Hz), alpha (8-12 Hz), low beta (12-20 Hz), high beta (20-30 Hz), and, gamma (30-45 Hz)). Results: LZC was significantly lower in subjects with MCI than in those with SCD. Moreover, subjects with MCI had significantly lower MEG complexity than controls and SCD subjects in the beta frequency band. Lower complexity was correlated with smaller hippocampal volumes. Conclusions: Brain complexity - measured with LZC - decreases in MCI patients when compared to SCD and healthy controls. This decrease is associated with a decrease in hippocampal volume, a key feature in AD progression. Significance: This is the first study to date characterising the changes of brain activity complexity showing the specific spatial pattern of the alterations as well as the morphological correlations throughout preclinical stages of AD. (C) 2019 International Federation of Clinical Neurophysiology. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:437 / 445
页数:9
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