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Wang JY, Qin JY, Ye JY, Li WT, Tong MQZ, Ouyang H, Yan FX. The Therapeutic Effects of Noninvasive Brain Stimulation Combined with Cognitive Training in Elders with Alzheimer's Disease or Amnesic Mild Cognitive Impairment. J Prev Alzheimers Dis 2024; 11:222-229. [PMID: 38230735 DOI: 10.14283/jpad.2024.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
BACKGROUND Recent studies have indicated that noninvasive brain stimulation combined with cognitive interval (NIBS-CI) improved cognitive function in people with Alzheimer's disease (AD) or Amnesic mild cognitive impairment (a-MCI). While previous interventions have demonstrated that a single targeted cognitive intervention can improve cognitive function, the outcomes of using both interventions simultaneously are less well-established. Therefore, this study aims to perform a meta-analysis to determine the effectiveness of NIBS-CI in treating cognitive impairment associated with AD and a-MCI, with the goal of obtaining novel insights into this combined intervention. METHODS PubMed, Web of Science, ProQuest and Central Cochrane library databases were searched up to December 2022. The primary cognitive outcomes were extracted from the included article. A mean difference (MD) and standardized mean difference (SMD) with a 95% confidence interval were calculated by using random-effect models. RESULTS Twelve studies with a total of 587 AD patients were included. The findings demonstrated that NIBS-CI significantly improved cognitive function of AD patients in cognitive outcomes (SMD = -0.52, 95%CI (-0. 93, -0.11)) and ADAS-COG (MD = -1.16, 95%CI (-1.69, -0.63)). The pooled results showed that NIBS-CI did not improve cognitive function of AD patients in short-time memory (SMD = 0.057, 95%CI (-0.13, 0.25), P = 0.56) and long-time memory (SMD = 0.001, 95%CI (-0.20, 0.20), P = 0.99). CONCLUSIONS There is evidence for a positive effect of NIBS-CI on overall cognitive function of AD and a-MCI. Considering the limited sample size, it is important to interpret the findings related to memory with caution. To obtain more robust results, future studies should be conducted with larger sample sizes and incorporate objective neurophysiological and neuroimaging tools. These methodological enhancements will allow for a better understanding of the therapeutic targets and provide a more comprehensive assessment of the effects of NIBS-CI treatment.
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Affiliation(s)
- J-Y Wang
- Hui Ouyang, Department of Rehabilitation, the First Affiliated Hospital of Jinan University, 601 Huangpu Avenue West, Tianhe District, Guangzhou 510632, Tel: +86-20-38688491, Fax: 86-20-38688491, and Fengxia Yan, Ph.D, School of Nursing, Jinan University, 601 Huangpu Avenue West, Tianhe District, Guangzhou 510632, P.R China. Tel:+86-20-85225836, Fax: 86-20-8522227,
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Zhang S, Zhu T, Tian Y, Jiang W, Li D, Wang D. Early screening model for mild cognitive impairment based on resting-state functional connectivity: a functional near-infrared spectroscopy study. Neurophotonics 2022; 9:045010. [PMID: 36483024 PMCID: PMC9722394 DOI: 10.1117/1.nph.9.4.045010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 11/15/2022] [Indexed: 05/19/2023]
Abstract
SIGNIFICANCE As an early stage of Alzheimer's disease (AD), the diagnosis of amnestic mild cognitive impairment (aMCI) has important clinical value for timely intervention of AD. Functional near-infrared spectroscopy (fNIRS)-based resting-state brain connectivity analysis, which could provide an economic and quick screening strategy for aMCI, remains to be extensively investigated. AIM This study aimed to verify the feasibility of fNIRS-based resting-state brain connectivity for evaluating brain function in patients with aMCI, and to determine an early screening model for auxiliary diagnosis. APPROACH The resting-state fNIRS was utilized for exploring the changes in functional connectivity of 64 patients with aMCI. The region of interest (ROI)-based and channel-based connections with significant inter-group differences have been extracted through the two-sample t -tests and the receiver operating characteristic (ROC). These connections with specificity and sensitivity were then taken as features for classification. RESULTS Compared with healthy controls, connections of the MCI group were significantly reduced between the bilateral prefrontal, parietal, occipital, and right temporal lobes. Specifically, the long-range connections from prefrontal to occipital lobe, and from prefrontal to parietal lobe, exhibited stronger identifiability (area under the ROC curve > 0.65 , ** p < 0.01 ). Subsequently, the optimal classification accuracy of ROI-based connections was 71.59%. Furthermore, the most responsive connections were located between the right dorsolateral prefrontal lobe and the left occipital lobe, concomitant with the highest classification accuracy of 73.86%. CONCLUSION Our findings indicate that fNIRS-based resting-state functional connectivity analysis could support MCI diagnosis. Notably, long-range connections involving the prefrontal and occipital lobes have the potential to be efficient biomarkers.
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Affiliation(s)
- Shen Zhang
- Beihang University, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing, China
| | - Ting Zhu
- Beihang University, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing, China
| | - Yizhu Tian
- Beihang University, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing, China
| | - Wenyu Jiang
- Guangxi Jiangbin Hospital, Department of Neurological Rehabilitation, Nanning, China
- Address all correspondence to Daifa Wang, ; Deyu Li, ; Wenyu Jiang,
| | - Deyu Li
- Beihang University, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing, China
- Beihang University, State Key Laboratory of Software Development Environment, Beijing, China
- Beihang University, State Key Laboratory of Virtual Reality Technology and System, Beijing, China
- Address all correspondence to Daifa Wang, ; Deyu Li, ; Wenyu Jiang,
| | - Daifa Wang
- Beihang University, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing, China
- Address all correspondence to Daifa Wang, ; Deyu Li, ; Wenyu Jiang,
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Iachini T, Ruotolo F, Iavarone A, Mazzi MC, Ruggiero G. From aMCI to AD: The Role of Visuo-Spatial Memory Span and Executive Functions in Egocentric and Allocentric Spatial Impairments. Brain Sci 2021; 11:1536. [PMID: 34827534 DOI: 10.3390/brainsci11111536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/17/2021] [Accepted: 11/17/2021] [Indexed: 11/29/2022] Open
Abstract
A difficulty in encoding spatial information in an egocentric (i.e., body-to-object) and especially allocentric (i.e., object-to-object) manner, and impairments in executive function (EF) are typical in amnestic mild cognitive impairment (aMCI) and Alzheimer’s disease (AD). Since executive functions are involved in spatial encodings, it is important to understand the extent of their reciprocal or selective impairment. To this end, AD patients, aMCI and healthy elderly people had to provide egocentric (What object was closest to you?) and allocentric (What object was closest to object X?) judgments about memorized objects. Participants’ frontal functions, attentional resources and visual-spatial memory were assessed with the Frontal Assessment Battery (FAB), the Trail Making Test (TMT) and the Corsi Block Tapping Test (forward/backward). Results showed that ADs performed worse than all others in all tasks but did not differ from aMCIs in allocentric judgments and Corsi forward. Regression analyses showed, although to different degrees in the three groups, a link between attentional resources, visuo-spatial memory and egocentric performance, and between frontal resources and allocentric performance. Therefore, visuo-spatial memory, especially when it involves allocentric frames and requires demanding active processing, should be carefully assessed to reveal early signs of conversion from aMCI to AD.
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Gao H, Wang J, Liu J, Ye S, Meng X, Song S, Wang C, Yu X, Zhu L, Wang H, Lei S, Yang Y. Peptoid Nanosheet-Based Sensing System for the Diagnosis and Surveillance of Amnestic Mild Cognitive Impairment and Alzheimer's Disease. ACS Chem Neurosci 2021; 12:4257-4264. [PMID: 34726371 DOI: 10.1021/acschemneuro.1c00613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Alzheimer's disease (AD) is one of the most common neurodegenerative diseases characterized by progressive cognitive decline. Early diagnosis and dynamic monitoring are essential to the treatment and care of AD but challenging. Here we develop a noninvasive, blood-based AD detection method based on surface plasmonic resonance imaging (SPRi) technique. The functionalized sensing SPRi chips were constructed with self-assembled loop-displaying peptoid nanosheets to improve the detection sensitivity of plasma amyloid β42 (Aβ42). We analyze the plasma from 30 clinically diagnosed AD patients, 29 amnestic cognitive impairment (aMCI) patients, and 30 control individuals and demonstrate that this sensing system can significantly distinguish the three groups with high sensitivity and specificity. In the follow-up studies of the aMCI patients, we find that decrease in the binding signals in the patients correlates with the disease progression into AD whereas the almost unchanged signals correlate with stable disease remaining at aMCI status. These results show the capability of the peptoid-nanosheet-based SRPi sensing system for the early diagnosis and dynamic monitoring of AD.
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Affiliation(s)
- Houqian Gao
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Jiali Wang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, P. R. China
| | - Jingyi Liu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Siyuan Ye
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Xue Meng
- Beijing Key Laboratory of Translational Medicine for the Diagnosis and Treatment of Dementia, Peking University Sixth Hospital (Institute of Mental Health), NHC Key Laboratory of Mental Health, National Clinical Research Center for Mental Disorders, Beijing 100190, China
| | - Shuya Song
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Chen Wang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Xin Yu
- Beijing Key Laboratory of Translational Medicine for the Diagnosis and Treatment of Dementia, Peking University Sixth Hospital (Institute of Mental Health), NHC Key Laboratory of Mental Health, National Clinical Research Center for Mental Disorders, Beijing 100190, China
| | - Ling Zhu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Huali Wang
- Beijing Key Laboratory of Translational Medicine for the Diagnosis and Treatment of Dementia, Peking University Sixth Hospital (Institute of Mental Health), NHC Key Laboratory of Mental Health, National Clinical Research Center for Mental Disorders, Beijing 100190, China
| | - Shengbin Lei
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, P. R. China
| | - Yanlian Yang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
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5
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Zhang L, Li T, Lei Y, Cheng G, Liu B, Yu Y, Yin H, Song L, La Q, Li B, Bao W, Guo Z, Rong S. Association between sleep structure and amnesic mild cognitive impairment in patients with insomnia disorder: a case-control study. J Clin Sleep Med 2021; 17:37-43. [PMID: 32946373 DOI: 10.5664/jcsm.8804] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
STUDY OBJECTIVES To examine the association between sleep structure and amnesic mild cognitive impairment (aMCI) in patients with insomnia disorder. METHODS A total of 256 patients with insomnia disorder were diagnosed by neurologists, 45 of whom were diagnosed with aMCI according to the Petersen criteria, and 45 participants with intact cognition were chosen as controls matched for age and education. A case-control study was conducted to compare sleep structure between aMCI and control patients with insomnia disorder. We evaluated self-reported sleep problems by the Insomnia Severity Index and objective sleep features by polysomnography. Logistic regression models were used to estimate the associations between sleep parameters and aMCI in patients with insomnia disorder. RESULTS There was no significant difference in Insomnia Severity Index scores between the aMCI and control groups. In the logistic regression after adjustment for covariates, people with a longer sleep duration (adjusted odds ratio [aOR] = 0.56, 95% confidence interval [CI]: 0.36-0.89), greater sleep efficiency (aOR = 0.50, 95% CI: 0.32-0.77), and a higher percentage of total sleep time in stage 3 of non-rapid eye movement sleep (N3%) (aOR = 0.02, 95% CI: 0.01-0.15) have a lower relative probability of having aMCI. By contrast, higher N1% (aOR = 2.28, 95% CI: 1.36-3.82) and wake after sleep onset (aOR = 1.31, 95% CI: 1.11-1.55) may be risk factors for aMCI in patients with insomnia. CONCLUSIONS In patients with insomnia disorder, sleep duration, sleep fragmentation, sleep efficiency, N1% and N3% were independently associated with the presence of aMCI. In the clinical setting, if patients with insomnia show much more serious abnormalities in these sleep indices, clinicians should pay attention to their cognitive function. In-depth research would also be worthwhile to elaborate the causality between sleep and cognitive decline.
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Affiliation(s)
- Li Zhang
- Department of Neurology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan, China
| | - Tingting Li
- Department of Nutrition and Food Hygiene, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Yuhua Lei
- Department of Nutrition and Food Hygiene, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Guangwen Cheng
- Department of Nutrition and Food Hygiene, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Buyun Liu
- Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, Iowa
| | - YongFei Yu
- Department of Neurology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan, China
| | - HongXiang Yin
- Department of Neurology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan, China
| | - Lin Song
- Department of Neurology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan, China
| | - Qiong La
- Department of Neurology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan, China
| | - Benchao Li
- Department of Nutrition and Food Hygiene, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
| | - Wei Bao
- Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, Iowa
| | - ZhenLi Guo
- Department of Neurology, Hubei Provincial Hospital of Integrated Chinese and Western Medicine, Wuhan, China
| | - Shuang Rong
- Department of Nutrition and Food Hygiene, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, China.,Hubei Province Key Laboratory of Occupational Hazard Identification and Control, Wuhan University of Science and Technology, Wuhan, China
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6
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Xu Y, Shen YY, Zhang XP, Gui L, Cai M, Peng GP, Pan XD, Zhang J, Gan D, Li B, Cheng HP, Deng J, Li WW, Zeng GH, Shi AY, Zhou ZH, Luo BY, Chen XC, Wang YJ. Diagnostic potential of urinary monocyte chemoattractant protein-1 for Alzheimer's disease and amnestic mild cognitive impairment. Eur J Neurol 2020; 27:1429-1435. [PMID: 32282975 DOI: 10.1111/ene.14254] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 03/31/2020] [Indexed: 02/02/2023]
Abstract
BACKGROUND AND PURPOSE The chemokine monocyte chemoattractant protein-1 (MCP-1) is involved in the pathogenesis of Alzheimer's disease (AD). This study aimed to investigate whether urinary MCP-1 can distinguish patients with AD, patients with amnestic mild cognitive impairment (aMCI) and cognitively normal (CN) subjects. METHODS A total of 754 participants, including 97 patients with AD, 50 patients with aMCI and 84 age- and sex-matched CN controls as well as a cohort of 523 CN subjects of different ages, were enrolled from five hospitals located in different areas of China. Urinary MCP-1 levels were determined using enzyme-linked immunosorbent assays. The correlations between urinary MCP-1 levels and cognition test scores or age were analysed. The optimal diagnostic sensitivity and specificity were determined using receiver operating characteristic curve analysis. RESULTS In the cohort of CN subjects of different ages, urinary MCP-1 levels increased with ageing and were correlated with age. The urinary MCP-1 levels were higher in females than in males. In the cohort composed of patients with AD, aMCI and age- and sex-matched CN controls, urinary MCP-1 levels were significantly higher in patients with AD and aMCI than in CN controls. There were no differences in urine MCP-1 levels between the AD group and the aMCI group. The urinary MCP-1 levels were correlated with the Mini-Mental State Examination scores and age, and were able to differentiate patients with AD and aMCI from CN subjects. CONCLUSIONS Urinary MCP-1 is a potential biomarker for the diagnosis of AD and aMCI.
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Affiliation(s)
- Y Xu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.,Department of Geriatrics, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China
| | - Y-Y Shen
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - X-P Zhang
- Department of General Practice, Chengdu Second People's Hospital, Chengdu, China
| | - L Gui
- Department of Neurology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - M Cai
- Department of Neurology, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China
| | - G-P Peng
- Department of Neurology, The First Affiliated Hospital of Zhejiang University, Hangzhou, China
| | - X-D Pan
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Fujian Institute of Geriatrics, Fuzhou, China.,Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - J Zhang
- Department of Geriatrics, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China
| | - D Gan
- Department of Geriatrics, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China
| | - B Li
- Department of Health Management, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China
| | - H-P Cheng
- Department of Health Management, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China
| | - J Deng
- Department of Health Management, Daping Hospital, Third Military Medical University, Chongqing, China
| | - W-W Li
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - G-H Zeng
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - A-Y Shi
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Z-H Zhou
- Department of Neurology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - B-Y Luo
- Department of Neurology, The First Affiliated Hospital of Zhejiang University, Hangzhou, China
| | - X-C Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Fujian Institute of Geriatrics, Fuzhou, China.,Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Y-J Wang
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.,State Key Laboratory of Trauma, Burn and Combined Injury, Third Military Medical University, Chongqing, China.,Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China
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Reda F, Gorgoni M, Lauri G, Truglia I, Cordone S, Scarpelli S, Mangiaruga A, D'Atri A, Ferrara M, Lacidogna G, Marra C, Rossini PM, De Gennaro L. In Search of Sleep Biomarkers of Alzheimer's Disease: K-Complexes Do Not Discriminate between Patients with Mild Cognitive Impairment and Healthy Controls. Brain Sci 2017; 7:brainsci7050051. [PMID: 28468235 PMCID: PMC5447933 DOI: 10.3390/brainsci7050051] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/18/2017] [Accepted: 04/27/2017] [Indexed: 02/05/2023] Open
Abstract
The K-complex (KC) is one of the hallmarks of Non-Rapid Eye Movement (NREM) sleep. Recent observations point to a drastic decrease of spontaneous KCs in Alzheimer’s disease (AD). However, no study has investigated when, in the development of AD, this phenomenon starts. The assessment of KC density in mild cognitive impairment (MCI), a clinical condition considered a possible transitional stage between normal cognitive function and probable AD, is still lacking. The aim of the present study was to compare KC density in AD/MCI patients and healthy controls (HCs), also assessing the relationship between KC density and cognitive decline. Twenty amnesic MCI patients underwent a polysomnographic recording of a nocturnal sleep. Their data were compared to those of previously recorded 20 HCs and 20 AD patients. KCs during stage 2 NREM sleep were visually identified and KC densities of the three groups were compared. AD patients showed a significant KC density decrease compared with MCI patients and HCs, while no differences were observed between MCI patients and HCs. KC density was positively correlated with Mini-Mental State Examination (MMSE) scores. Our results point to the existence of an alteration of KC density only in a full-blown phase of AD, which was not observable in the early stage of the pathology (MCI), but linked with cognitive deterioration.
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Affiliation(s)
- Flaminia Reda
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | - Maurizio Gorgoni
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | - Giulia Lauri
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | - Ilaria Truglia
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | - Susanna Cordone
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | - Serena Scarpelli
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | | | - Aurora D'Atri
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
| | - Michele Ferrara
- Department of Biotechnological and Applied Clinical Science, University of L'Aquila, L'Aquila 67100, Italy.
| | - Giordano Lacidogna
- Institute of Neurology, Catholic University of The Sacred Heart, Rome 00168, Italy.
| | - Camillo Marra
- Institute of Neurology, Catholic University of The Sacred Heart, Rome 00168, Italy.
| | - Paolo Maria Rossini
- Institute of Neurology, Catholic University of The Sacred Heart, Rome 00168, Italy.
- Istituto di Ricovero e Cura a Carattere Scientifico, San Raffaele Pisana, Rome 00163, Italy.
| | - Luigi De Gennaro
- Department of Psychology, Sapienza University of Rome, Rome 00185, Italy.
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Li BY, Tang HD, Chen SD. Retrieval Deficiency in Brain Activity of Working Memory in Amnesic Mild Cognitive Impairment Patients: A Brain Event-Related Potentials Study. Front Aging Neurosci 2016; 8:54. [PMID: 27047371 PMCID: PMC4803731 DOI: 10.3389/fnagi.2016.00054] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/07/2016] [Indexed: 11/19/2022] Open
Abstract
In the early stage of Alzheimer disease (AD) or mild cognitive impairment (MCI), working memory (WM) deficiency is prominent and could be attributed to failure in encoding, maintenance or retrieval of information. However, evidence for a retention or retrieval deficit remains equivocal. It is also unclear what cognitive mechanism in WM is impaired in MCI or early AD. We enrolled 46 subjects from our Memory Clinics and community, with 24 amnesic MCI patients and 22 normal subjects. After neurological and cognitive assessments, they performed a classic delayed match to sample (DMS) task with simultaneous event-related potential (ERP) recorded. The ERPs in encoding and retrieval epoch during WM were analyzed separately. The latency and amplitude of every ERP component were compared between two groups, and then analyzed to explore their relationship with neuropsychological performance. Finally, the locations of maximal difference in cortex were calculated by standard low-resolution tomographic analysis. A total of five components were found: P1, N1, P2, N2, and P300. The amplitude of P2 and P300 was larger in normal subjects than in MCI patients only during retrieval, not encoding epoch, while the latency did not show statistical difference. The latency and amplitude of P1 and N1 were similar in two groups. P2 amplitude in the retrieval epoch positively correlated with memory test (auditory verbal learning test) and visual spatial score of Chinese Addenbrooke's Cognitive Examination-Revised (ACE-R), while P300 amplitude correlated with ACE-R. The activation difference in P2 time range was maximal at medial frontal gyrus. However, the difference in cortex activation during P300 time range did not show significance. The amplitude of P2 indicated deficiency in memory retrieval process, potentially due to dysfunction of central executive in WM model. Regarding the location of P2 during WM task, medial frontal plays important role in memory retrieval. The findings in the present study suggested that MCI patients have retrieval deficit, probably due to central executive based on medial frontal gyrus. Thus, it may provide new biomarker for early detection and intervention for aMCI.
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Affiliation(s)
- Bin-Yin Li
- Department of Neurology and Collaborative Innovation Center for Brain Science, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai, China
| | - Hui-Dong Tang
- Department of Neurology and Collaborative Innovation Center for Brain Science, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai, China
| | - Sheng-Di Chen
- Department of Neurology and Collaborative Innovation Center for Brain Science, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai, China; Laboratory of Neurodegenerative Diseases and Key Laboratory of Stem Cell Biology, Institute of Health Science, Shanghai Institutes for Biological Sciences, Chinese Academy of Science and Shanghai Jiao Tong University School of MedicineShanghai, China
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Meléndez JC, Redondo R, Torres M, Mayordomo T, Sales A. Autobiographical memory for the differential diagnosis of cognitive pathology in aging. Geriatr Gerontol Int 2015; 16:1220-1225. [PMID: 26460189 DOI: 10.1111/ggi.12611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2015] [Indexed: 11/28/2022]
Abstract
AIM The present study distinguishes three memory stages across the lifespan, and aims to compare episodic and semantic autobiographical memory in healthy older adults, with amnesic mild cognitive impairment, and with Alzheimer's disease. This information can offer evidence about the way semantic and episodic autobiographical memory work, and how the disease affects them. METHODS The sample was composed of 56 people, all aged over 60 years; 15 with amnestic mild cognitive impairment, 12 with Alzheimer's disease and 29 healthy older people. Participants were evaluated with the Autobiographical Memory Interview. RESULTS A mixed anova showed significant main effects of memory and time-period, and significant interactions of memory × group, time-period × group and memory × time × group. DISCUSSION Assessment of autobiographical memory provides information to differentiate amnestic mild cognitive impairment patients from Alzheimer's disease patients. Although the decline in episodic memory starts with the onset of the disease, semantic memory is maintained until moderate stages of dementia. Geriatr Gerontol Int 2016; 16:1220-1225.
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Affiliation(s)
- Juan C Meléndez
- Department of Developmental Psychology, Faculty of Psychology, University of Valencia, Valencia, Spain
| | - Rita Redondo
- Department of Developmental Psychology, Faculty of Psychology, University of Valencia, Valencia, Spain
| | - Marta Torres
- Department of Developmental Psychology, Faculty of Psychology, University of Valencia, Valencia, Spain
| | - Teresa Mayordomo
- Department of Methodology for the Behavioral Sciences, Faculty of Psychology, University of Valencia, Valencia, Spain
| | - Alicia Sales
- Department of Developmental Psychology, Faculty of Psychology, University of Valencia, Valencia, Spain
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Liu YY, Yang ZX, Shen ZW, Xiao YY, Cheng XF, Chen W, Chen YW, Wu RH. Magnetic Resonance Spectroscopy Study of Amnestic Mild Cognitive Impairment and Vascular Cognitive Impairment With No Dementia. Am J Alzheimers Dis Other Demen 2014; 29:474-81. [PMID: 23823139 PMCID: PMC10852712 DOI: 10.1177/1533317513495106] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Amnestic mild cognitive impairment (aMCI) and vascular cognitive impairment with no dementia (VCIND) are highly predictive of Alzheimer's disease and vascular dementia. In this study, a 2-dimensional magnetic resonance spectroscopy was performed in 25 patients with aMCI, 28 patients with VCIND, and 32 normal controls (NCs). The concentrations of N-acetyl aspartate (NAA), choline (Cho), myoinositol (MI), and creatine (Cr) were measured, and their ratios were calculated. The patients with aMCI displayed significantly lower NAA/MI bilaterally in the posterior cingulate gyrus (PCG) and white matter of occipital lobe (OLWM) than NC participants or patients with VCIND , whereas patients with VCIND displayed markedly lower NAA/Cho bilaterally in the white matter of frontal lobe (FLWM) and left OLWM, and right dorsal thalamus (DT) than patients with NC or aMCI. Compared with the controls, patients with aMCI displayed lower NAA and NAA/Cr in bilateral PCG, left precuneus, and DT, whereas patients with VCIND displayed lower NAA/Cr in bilateral DT and FLWM. In addition, increased MI in right PCG of patients with aMCI and increased Cho in left FLWM of patients with VCIND were also observed. The results might help guide a clinical differentiation between the 2 disorders.
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Affiliation(s)
- Yan-Yan Liu
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Zhong-Xian Yang
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Zhi-Wei Shen
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Ye-Yu Xiao
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Xiao-Fang Cheng
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Wei Chen
- Department of Neurology, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Yao-Wen Chen
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
| | - Ren-Hua Wu
- Department of Medical Imaging Center, the Second Affiliated Hospital, Medical College of Shantou University, Shantou, China Provincial Key Laboratory of Medical Molecular Imaging, Guangdong, Shantou, China
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