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MCI患者高阶动态功能连接的图论网络构建方法及分类 被引量:1
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作者 王霞 王勇 +2 位作者 吴海锋 张珊 王卓然 《计算机应用研究》 CSCD 北大核心 2024年第4期1094-1103,共10页
针对在低阶脑网络应用图论忽视了功能连接高阶动态性的问题,提出了一种基于高阶动态功能连接的图论网络构建方法(GNC-HodFC),提取高阶FC网络的图论特征以对轻度认知障碍患者和健康被试者进行差异性分析及分类。首先定义了表征高阶动态... 针对在低阶脑网络应用图论忽视了功能连接高阶动态性的问题,提出了一种基于高阶动态功能连接的图论网络构建方法(GNC-HodFC),提取高阶FC网络的图论特征以对轻度认知障碍患者和健康被试者进行差异性分析及分类。首先定义了表征高阶动态脑网络连接的图论节点和边;然后利用滑动窗相关技术提取低阶功能连接信息,提出平稳性判据,选取最优特征子集以构建图论的节点;最后提出自适应阈值策略对高阶动态功能连接信息进行选取以构建图论的边,最终完成高阶动态脑网络的图构建。实验结果表明,GNC-HodFC的平均分类准确率可以达到70.5%,优于其他三种对比方法,且患者组和健康组的图论特征中存在显著性差异,GNC-HodFC方法可以为轻度认知障碍的诊断提供新的辅助手段。 展开更多
关键词 轻度认知障碍 动态功能连接 图论 低阶网络 高阶网络
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VR支持训练联合中医情志护理对MCI人群认知领域的影响研究
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作者 罗文琴 汪秋艳 《临床护理杂志》 2024年第3期6-9,共4页
目的探讨虚拟现实技术(VR)支持训练联合中医情志护理对轻度认知障碍(MCI)人群认知领域的影响。方法选择2023年7月-11月我院收治的MCI患者60例,按随机数字表法分为观察组和对照组,各30例。对照组开展常规认知康复训练,观察组在对照组的... 目的探讨虚拟现实技术(VR)支持训练联合中医情志护理对轻度认知障碍(MCI)人群认知领域的影响。方法选择2023年7月-11月我院收治的MCI患者60例,按随机数字表法分为观察组和对照组,各30例。对照组开展常规认知康复训练,观察组在对照组的基础上开展VR支持训练联合中医情志护理,两组均连续训练6周。比较两组训练前后蒙特利尔认知评价量表(MoCA)、简易智力状态检查量表(MMSE)评分。结果对照组训练后MoCA总分及注意与集中力、记忆力评分均升高(P<0.05),MMSE总分及记忆力、计算和注意力评分均升高(P<0.05);观察组训练后MoCA总分及注意与集中力、记忆力、视空间执行力评分均升高(P<0.05),MMSE总分及记忆力、计算和注意力评分均升高(P<0.05);观察组训练后MoCA总分及注意与集中力、记忆力、视空间执行力评分,MMSE总分及记忆力、计算和注意力评分均高于对照组(P<0.05)。结论VR支持训练联合中医情志护理可有效改善MCI人群的认知功能,康复训练效果好,可应用于临床。 展开更多
关键词 轻度认知障碍 虚拟现实技术 中医情志护理
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Psychophysiological Effects of Sideritis and Bacopa Extract and Three Combinations Thereof—A Quantitative EEG Study in Subjects Suffering from Mild Cognitive Impairment (MCI) 被引量:2
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作者 Wilfried Dimpfel Leonie Schombert Andreas Biller 《Advances in Alzheimer's Disease》 2016年第1期1-22,共22页
Mild cognitive impairment (MCI) is regarded as a transitional stage during the development of Alzheimer’s disease. Diagnosis of MCI can be obtained by the questionnaire “DemTect” in German speaking countries. Quant... Mild cognitive impairment (MCI) is regarded as a transitional stage during the development of Alzheimer’s disease. Diagnosis of MCI can be obtained by the questionnaire “DemTect” in German speaking countries. Quantitative assessment has been successfully performed using psychometric testing concomitantly with quantitative EEG recording. The present investigation aimed at the possible treatment of MCI with two botanicals, namely extracts from Sideritis scardica (500 mg) or Bacopa monnieri (320 mg) and three combinations thereof using this method in order to find a new treatment. The performance of the d2-test, an arithmetic calculation test (CPT) and a memory-test revealed better performance for the d2-test only in the presence of Sideritis extract or the combinations with Bacopa extract. Quantitative EEG assessment during the different experimental conditions showed massive differences between both extracts. Whereas Sideritis extract and its combination with a low amount of Bacopa extract (160 mg) induced increases of spectral power in fronto-temporal brain areas, Bacopa and the combination of Sideritis with high amounts of Bacopa extract produced attenuation of all waves except for delta in fronto-temporal brain areas. These differences were also documented by quantitative EEG maps in comparison to Placebo. A different action of both extracts was confirmed by discriminant analysis, where Sideritis extract and its combination with low Bacopa grouped together quite at distance to Bacopa and the combination of Sideritis with high Bacopa. A combination of Sideritis extract with a low amount of Bacopa should be tested with daily repetitive dosing for at least 4 weeks as a consequence. 展开更多
关键词 DemTect Cognition PSYCHOMETRY EEG Source density mild Cognitive Impairment (mci) Alzheimer’s Disease CATEEM SIDERITIS Bacopa
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基于多尺度熵特征优化算法的MCI早期诊断及敏感脑区分析 被引量:1
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作者 杨长杰 李昕 +3 位作者 侯永捷 王玉琳 刘沁爽 苏芮 《中国生物医学工程学报》 CAS CSCD 北大核心 2023年第3期274-280,共7页
轻度认知障碍(MCI)是阿尔兹海默病诊疗的关键时期,迫切需要早发现,早干预。针对MCI早期诊断问题,特别是早期诊断的敏感脑区定位问题,提出一种基于多尺度熵的脑电信号特征提取优化算法,即多尺度熵特征优化算法。该算法通过构建多重尺度序... 轻度认知障碍(MCI)是阿尔兹海默病诊疗的关键时期,迫切需要早发现,早干预。针对MCI早期诊断问题,特别是早期诊断的敏感脑区定位问题,提出一种基于多尺度熵的脑电信号特征提取优化算法,即多尺度熵特征优化算法。该算法通过构建多重尺度序列,并充分考虑各序列贡献程度,最大程度挖掘细节信息。共采集49名受试者临床脑电信号数据,其中实验组(MCI组)28名,正常对照组21名。对比分析实验组与对照组,MCI组16通道多尺度熵特征优化算法熵值均低于对照组,且前额叶、前颞叶以及中颞叶脑区具有显著性差异(P<0.01)。仅以此特征作为分类器输入特征,分析前额叶、前颞叶以及中颞叶3个脑区,其脑区诊断测试集识别率分别为83.33%、86.67%、73.33%。进一步,分析识别率最高的前颞叶两通道的AUC值分别为0.753与0.733。多尺度熵特征优化算法熵特征能够充分反应脑电信号变化,是可以作为MCI早期诊断的一种特征标记,前颞叶脑区可以为评估MCI患者脑认知功能状态的敏感脑区提供研究支持。 展开更多
关键词 多尺度熵特征优化算法 早期诊断 敏感脑区定位 轻度认知障碍
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多格列艾汀联合二甲双胍治疗2型糖尿病合并轻度认知功能障碍的疗效观察
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作者 李汶珊 苏亮 +1 位作者 李木源 徐景涛 《新疆医科大学学报》 CAS 2024年第11期1458-1463,共6页
目的观察多格列艾汀联合二甲双胍治疗2型糖尿病(T2DM)合并轻度认知功能障碍(MCI)的疗效。方法选取2022年11月至2023年11月潍坊市人民医院90例T2DM合并MCI患者,按随机数字表法分为对照组和联合组,各45例。对照组采用二甲双胍治疗,联合组... 目的观察多格列艾汀联合二甲双胍治疗2型糖尿病(T2DM)合并轻度认知功能障碍(MCI)的疗效。方法选取2022年11月至2023年11月潍坊市人民医院90例T2DM合并MCI患者,按随机数字表法分为对照组和联合组,各45例。对照组采用二甲双胍治疗,联合组于对照组基础上联合多格列艾汀治疗。比较两组治疗前后血糖水平、血糖波动情况、认知功能、认知功能相关生化指标[同型半胱氨酸(Hcy)、脑源性神经营养因子(BDNF)、脱氢表雄酮(DHEA)]、不良反应发生情况。结果两组患者治疗后糖化血红蛋白(HbAlc)、餐后2 h血糖(2 h PG)、空腹血糖(FPG)均较治疗前降低,且联合组HbAlc、2 h PG、FPG低于对照组(P<0.05);两组患者治疗后餐后血糖波动幅度(PPGE)、血糖水平标准差(SDBG)、日间血糖平均绝对差(MODD)、平均血糖波动幅度(MAGE)均较治疗前降低,且联合组PPGE、SDBG、MODD、MAGE低于对照组(P<0.05);两组患者治疗后蒙特利尔认知评估量表(MoCA)评分较治疗前升高,且联合组MoCA评分高于对照组(P<0.05);两组患者治疗后BDNF、DHEA均较治疗前升高,Hcy较治疗前降低,且联合组BDNF、DHEA水平高于对照组,Hcy水平低于对照组(P<0.05);联合组不良反应发生率与对照组比较差异无统计学意义(P>0.05)。结论多格列艾汀联合二甲双胍能显著降低T2DM合并MCI患者的血糖水平和血糖波动,改善认知功能障碍。 展开更多
关键词 二甲双胍 多格列艾汀 2型糖尿病 认知功能障碍
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MCI患者的注意功能障碍反应时研究 被引量:13
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作者 周爱红 王荫华 周晓林 《中国神经免疫学和神经病学杂志》 CAS 2005年第4期195-198,共4页
目的探讨轻度认知功能障碍(mildcognitiveimpairment,MCI)患者大脑注意功能的改变。方法应用精确计时软件DMDX编制程序,在计算机上系统的测查MCI患者的注意功能,并与正常老年人(normalcon trol,NC)对比。分别采用持续操作任务实验(conti... 目的探讨轻度认知功能障碍(mildcognitiveimpairment,MCI)患者大脑注意功能的改变。方法应用精确计时软件DMDX编制程序,在计算机上系统的测查MCI患者的注意功能,并与正常老年人(normalcon trol,NC)对比。分别采用持续操作任务实验(continuousperformancetest,CPT)测查持续注意功能(MCI17例、NC18名),斯特鲁普(Stroop)实验测查选择注意功能(MCI19名、NC20名),双任务实验测查分散注意能力(MCI18例、NC19名)。结果CPT实验中,MCI患者的反应时、漏报率和虚报率与NC组间无差别。Stroop实验中,2组被试均表现出明显的干扰效应;尽管MCI组反应时干扰量和错误率干扰量与NC组差异无显著性,但一致和中性条件下的反应时长于NC组,总错误率以及一致和中性条件下的错误率高于NC组。双任务实验中MCI组和NC组间无差别。结论与NC相比,MCI患者选择注意功能有下降趋势,持续和分散注意能力正常。 展开更多
关键词 轻度认知功能障碍 持续操作任务实验 斯特鲁普(Stroop)实验 双任务实验 反应时
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肝主疏泄功能与MCI相关性理论探讨 被引量:4
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作者 沈玮 陈霞 詹向红 《中华中医药学刊》 CAS 北大核心 2017年第4期870-872,共3页
肝主疏泄,调节气机,调畅精气血的运行、输布及情志活动。精气血是人体生命活动的物质基础,精气血亏虚、瘀滞是MCI发生之根本,情志失调是导致MCI重要因素之一。因此,肝主疏泄功能与MCI关系密切。从肝入手,探讨传统中医对MCI的认识、梳理... 肝主疏泄,调节气机,调畅精气血的运行、输布及情志活动。精气血是人体生命活动的物质基础,精气血亏虚、瘀滞是MCI发生之根本,情志失调是导致MCI重要因素之一。因此,肝主疏泄功能与MCI关系密切。从肝入手,探讨传统中医对MCI的认识、梳理肝主疏泄的生理和病理变化与MCI的关系,以期为中医探讨防治MCI相关机制提供更为宽广的领域。 展开更多
关键词 肝主疏泄 中医学 衰老 轻度认知障碍(mci)
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轻度认知障碍分类中全脑功能连接的特征压缩分析
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作者 马佳 吴海锋 李顺良 《数据采集与处理》 CSCD 北大核心 2024年第4期967-983,共17页
利用静息态功能磁共振成像技术获取脑区的功能连接(Functional connection,FC)被广泛地应用于轻度认知功能障碍(Mild cognitive impairment,MCI)的分类研究中。然而,全脑FC用于分类通常存在信息冗余和特征维度灾难问题,为此,提出一种“G... 利用静息态功能磁共振成像技术获取脑区的功能连接(Functional connection,FC)被广泛地应用于轻度认知功能障碍(Mild cognitive impairment,MCI)的分类研究中。然而,全脑FC用于分类通常存在信息冗余和特征维度灾难问题,为此,提出一种“G-Lasso+特征压缩”的新方法来解决以上问题。首先,利用盲源分离技术获得全脑功能脑区的活跃信号时间序列,采用G-Lasso构建FC稀疏网络;其次,计算MCI患者、正常被试及所有被试在组平均上的稀疏FC,并结合欧氏距离进行簇Class 1~Class 3中心判决,获取簇间差异特征信息;最后,将每个被试的稀疏FC表达为簇中心的线性组合,获取压缩的FC作为关键特征完成分类。实验采用公开的数据库测试本文方法,结果表明,所提方法进行Class判决后获得簇间特征具有显著差异且提供了有效的标志信息,进一步压缩获取关键特征的分类准确率(89.8%)比仅使用稀疏方法提高了5%~10%。该结果表明,为了解决全脑FC存在的问题,需要考虑到特征选择和降维,但有诸多不确定因素信息,可以适当地将“稀疏+压缩”进行结合。 展开更多
关键词 功能连接 稀疏网络 轻度认知障碍 特征压缩 分类
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基于轻度认知障碍高阶动态功能连接的脑网络时变分析
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作者 王霞 王勇 兰青 《波谱学杂志》 CAS 2024年第3期286-303,共18页
现有研究常用功能连接(FC)结合图论分析完成轻度认知障碍(MCI)疾病的辅助诊断.传统FC分析方法通常以低阶FC网络为对象,而高阶FC网络能够揭示脑网络中更高层次的交互关系,但在高阶FC网络中涉及图论研究尚少,且传统图论指标在高阶FC网络... 现有研究常用功能连接(FC)结合图论分析完成轻度认知障碍(MCI)疾病的辅助诊断.传统FC分析方法通常以低阶FC网络为对象,而高阶FC网络能够揭示脑网络中更高层次的交互关系,但在高阶FC网络中涉及图论研究尚少,且传统图论指标在高阶FC网络中具有局限性.本文通过高阶动态功能连接构建高阶FC网络,结合图论对MCI和正常认知(NC)的脑网络状态进行分析,定义了阻滞系数和平均转换时间两个新的图论指标,以表征脑网络的时间变异性.结果表明在高阶FC网络中应用图论能有效提取MCI组和NC组之间的差异性信息,所提出的阻滞系数和平均转换时间指标均能呈现显著性差异,为高阶脑网络的研究提供了一种新的分析方法. 展开更多
关键词 轻度认知障碍 时间变异性 高阶功能连接网络 图论指标
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绞股蓝皂甙改善MCI大鼠学习记忆能力的机制探讨 被引量:2
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作者 姚淞元 姚伟 +2 位作者 黄琪 王金勇 何今成 《浙江临床医学》 2014年第7期1033-1035,共3页
目的:探讨绞股蓝皂甙(GP)改善轻度认知功能障碍(MCI)大鼠学习记忆能力的作用及其机制。方法将12-15个月龄SD健康大鼠随机分为5组:假手术对照组(SSC组)、MCI模型对照组(MCI组)和GP低、中、高剂量组(LGP组、MGP组、HGP组),每... 目的:探讨绞股蓝皂甙(GP)改善轻度认知功能障碍(MCI)大鼠学习记忆能力的作用及其机制。方法将12-15个月龄SD健康大鼠随机分为5组:假手术对照组(SSC组)、MCI模型对照组(MCI组)和GP低、中、高剂量组(LGP组、MGP组、HGP组),每组20只。通过结扎双侧颈内动脉(ICA)致其重度狭窄并大脑持续低灌注2个月,建立MCI大鼠模型。采用GP连续灌胃2个月作用于MCI大鼠,观察各组大鼠行为学、大脑皮层和海马超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性和丙二醛(MDA)、一氧化氮合酶(NOS)、一氧化氮(NO)含量的变化。结果(1)与MCI组比较,LGP组、MGP组、HGP组的潜伏期依次变短(P〈0.01),其中HGP组的潜伏期接近SSC组(P〉0.05)。(2)与MCI组比较,LGP组、MGP组、HGP组穿过原平台位置的次数依次增多(P〈0.01)、在原平台象限游泳的时间百分比依次增高(P〈0.01);其中HGP组的次数和时间百分比接近SSC组(P〉0.05)。(3)与MCI组比较,LGP组、MGP组、HGP组的SOD、GSH-Px活性依次升高(P〈0.01),MDA、NOS、NO含量依次降低(P〈0.01);其中HGP组的SOD、GSH-Px活性以及MDA、NOS、NO含量接近SSC组(P〉0.05)。结论绞股蓝皂甙可能通过提高脑组织SOD、GSH-Px活性、抑制NOS活性以及降低MDA、NO含量,改善MCI大鼠学习记忆能力。 展开更多
关键词 阿尔茨海默病 轻度认知功能障碍 绞股蓝皂甙 超氧化物歧化酶 丙二醛
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基于网络拓扑特性的MCI分类
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作者 接标 张道强 《数据采集与处理》 CSCD 北大核心 2013年第5期602-607,共6页
阿尔茨海默氏病(Alzheimer′s disease,AD)和轻度认知障碍(Mild cognitive impairment,MCI)是经常发生在老年人中的脑疾病,其主要表现为认知和智力的障碍。机器学习和模式识别方法已经被应用到对AD和MCI的诊断和分类中。最近,研究人员... 阿尔茨海默氏病(Alzheimer′s disease,AD)和轻度认知障碍(Mild cognitive impairment,MCI)是经常发生在老年人中的脑疾病,其主要表现为认知和智力的障碍。机器学习和模式识别方法已经被应用到对AD和MCI的诊断和分类中。最近,研究人员提出利用大脑连接网络实现对疾病的诊断和分类。大部分的研究主要集中在网络中提取一些局部的特性(如聚类系数),并利用机器学习的方法(如支持向量机)来实现对疾病的分类。然而,存在的研究表明AD以及MCI是和一个大规模的脑连接网络相关,而不仅是大脑的若干区域。因此,本文提出一种新的基于网络整体拓扑结构信息的分类方法,并将其用于对MCI疾病的分类。实验结果表明,本文的方法能够对分类结果有重要的改进。 展开更多
关键词 图核 核方法 连接网络 轻度认知障碍
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脑白质高信号的中青年轻度认知功能障碍患者认知功能特点及脑血流改变情况分析
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作者 严一丹 张羽 +4 位作者 杨素新 章腾 赵莉 唐铁钰 许笑天 《中国临床新医学》 2024年第6期632-638,共7页
目的分析脑白质高信号(WMH)的中青年轻度认知功能障碍(MCI)患者的认知功能特点及脑血流改变情况。方法招募2023年2月至12月扬州大学附属医院神经内科收治的WMH患者70例,年龄35~65岁,均行神经心理量表评分、颅脑MRI及经颅多普勒(TCD)检查... 目的分析脑白质高信号(WMH)的中青年轻度认知功能障碍(MCI)患者的认知功能特点及脑血流改变情况。方法招募2023年2月至12月扬州大学附属医院神经内科收治的WMH患者70例,年龄35~65岁,均行神经心理量表评分、颅脑MRI及经颅多普勒(TCD)检查,收集其一般临床资料。根据北京版蒙特利尔认知量表(MoCA)评分将研究对象分为MCI组(MoCA评分20~24分,36例)和对照组(MoCA评分25~30分,34例)。比较两组临床基线资料、认知亚域评分、TCD指标。采用logistic回归分析探讨大脑中动脉(MCA)搏动指数(PI)与MCI发生的关联性。结果对照组MoCA的视空间与执行功能、命名、注意力、语言、抽象思维以及延迟记忆能力显著优于MCI组(P<0.05)。MCI组的听觉词语学习测验华山版(AVLT-H)长延迟回忆得分及总分低于对照组,差异有统计学意义(P<0.05)。MCI组词语流畅性实验(VFT)得分、符号数字转化测验(SDMT)得分、画钟测验(CDT)得分低于对照组,连线测试A(TMT-A)、连线测试B(TMT-B)耗时长于对照组,差异有统计学意义(P<0.05)。MCI组MCA的PI水平高于对照组,差异有统计学意义(P<0.05),其余TCD指标比较差异无统计学意义(P>0.05)。经调整性别、高血压病史、糖尿病史、高血脂病史、吸烟史及饮酒史因素后,logistic回归分析结果显示,MCA的PI水平升高是促进MCI发生的危险因素[OR(95%CI)=348.877(2.046~59419.483),P=0.026]。结论WMH的中青年MCI患者的语言、视空间、记忆、执行、注意与处理速度等认知亚域功能均有所下降。MCA的PI水平升高有助于识别MCI高危人群。 展开更多
关键词 轻度认知功能障碍 经颅多普勒 脑白质高信号 血流动力学 认知功能 中青年
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老年人轻度认知功能障碍危险因素现状研究
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作者 陈传英 袁君 +3 位作者 彭惠忍 于利 杨静 欧阳元芳 《循证护理》 2024年第15期2745-2751,共7页
目的:探索老年人轻度认知功能障碍(MCI)发生的危险因素,为构建MCI风险预警模型提供数据支持。方法:选取2023年2月—8月住院老年人206例作为研究对象,收集并整理病人基本资料和MCI可能发生的因素。基于Rothman-Keller模型,构建单因素分... 目的:探索老年人轻度认知功能障碍(MCI)发生的危险因素,为构建MCI风险预警模型提供数据支持。方法:选取2023年2月—8月住院老年人206例作为研究对象,收集并整理病人基本资料和MCI可能发生的因素。基于Rothman-Keller模型,构建单因素分析、多因素Logistic回归分析模型,并绘制预测模型可视化。结果:206例老年人中,69例发生MCI,发生率为33.5%。MCI的发生受到多种危险因素的影响,包括年龄、吸烟、睡眠障碍、糖尿病和高血压。积极参与社会活动是预防MCI的保护因素。但当前的结论仅能表明参与社会活动与发生MCI相关,并不能确定因果关系。结论:鼓励个体积极参与各种社交和心理刺激活动,并采取健康的生活方式,是预防和管理MCI的重要策略,今后应进一步使用更全面的设计和代表性样本以验证这些结果,并更好地理解社会活动对认知功能障碍的影响。 展开更多
关键词 老年人 轻度认知功能障碍 危险因素 预测模型
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基于SVM的fMRI数据分类及MCI诊断应用 被引量:4
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作者 吕艳阳 相洁 《计算机工程与设计》 CSCD 北大核心 2013年第9期3313-3317,共5页
为了有效提高轻度认知障碍(mild cognitive impairment,MCI)的早期诊断效果,提出了基于SVM的fMRI数据分类方法,并构建分类准确率更高的集成分类器。传统的MCI诊断过程,检验周期长、主观误差较大,为此,利用数据挖掘技术,采用SVM数据分类... 为了有效提高轻度认知障碍(mild cognitive impairment,MCI)的早期诊断效果,提出了基于SVM的fMRI数据分类方法,并构建分类准确率更高的集成分类器。传统的MCI诊断过程,检验周期长、主观误差较大,为此,利用数据挖掘技术,采用SVM数据分类方法,通过提取单个体素的分类特征,对fMRI图像作分类,并分析分类准确率较高的体素分布区域。通过加权平均的方法,构建集成分类器,更好地辅助临床诊断。 展开更多
关键词 轻度认知障碍 数据分类 支持向量机 分类算法 分类器集成
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Inter- and intra-hemispheric EEG coherence in patients with mild cognitive impairment at rest and during working memory task 被引量:10
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作者 JIANG Zheng-yan ZHENG Lei-lei 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2006年第5期357-364,共8页
Objective: To assess functional relationship by calculating inter- and intra-hemispheric electroencephalography (EEG) coherence at rest and during a working memory task of patients with mild cognitive impairment (... Objective: To assess functional relationship by calculating inter- and intra-hemispheric electroencephalography (EEG) coherence at rest and during a working memory task of patients with mild cognitive impairment (MCI). Methods: The sample consisted of 69 subjects: 35 patients (n = 17 males, n = 18 females; 52-71 years old) and 34 normal controls (n = 17 males, n = 17 females; 51 -63 years old). Mini-mental state examination (MMSE) of two groups revealed that the scores of MCI patients did not differ significantly from those of normal controls (P〉0.05). In EEG recording, subjects were performed at rest and during working memory task. EEG signals from F3-F4, C3-C4, P3-P4, T5-T6 and O1-O2 electrode pairs are resulted from the inter-hemispheric action, and EEG signals from F3-C3, F4-C4, C3-P3, C4-P4, P3-O1, P4-O2, T5-C3, T6-C4, T5-P3 and T6-P4 electrode pairs are resulted from the intra-hemispheric action for delta (1.0-3.5 Hz), theta (4.0-7.5 Hz), alpha-1 (8.0-10.0 Hz), alpha-2 (10.5-13.0 Hz), beta-1 (13.5-18.0 Hz) and beta-2 (18.5-30.0 Hz) frequency bands. The influence of inter- and intra-hemispheric coherence on EEG activity with eyes closed was examined using fast Fourier transformation from the 16 sampled channels. Results: During working memory tasks, the inter- and intra-hemispheric EEG coherences in all bands were significantly higher in the MCI group in comparison with those in the control group (P〈0.05). However, there was no significant difference in inter- and intra-hemispheric EEG coherences between two groups at rest. Conclusion: Experimental results comprise evidence that MCI patients have higher degree of functional connectivity between hemispheres and in hemispheres during working condition, It suggests that MCI may be associated with compensatory processes during working memory tasks between hemispheres and in hemispheres. Moreover, failure of normal cortical connections may exist in MCI patients. 展开更多
关键词 mild cognitive impairment mci EEG COHERENCE Working memory Cortical connectivity
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Memory Training and Task Specificity in 90-99-Year-Old Seniors with Mild Cognitive Impairment 被引量:3
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作者 Peter A. Magaro Bruce Brotter Mariyam Jalees 《Advances in Aging Research》 2015年第1期1-12,共12页
Managing memory deficits is a central problem among older adults with mild cognitive impairment (MCI). This study examined the effects of memory training on memory performance in an understudied “oldest-old” populat... Managing memory deficits is a central problem among older adults with mild cognitive impairment (MCI). This study examined the effects of memory training on memory performance in an understudied “oldest-old” population ranging in age from 90 to 99 years. Eighteen mild to moderately cognitive-impaired older seniors, 90 years and older were recruited from memory clinics established in senior living communities. Treatment sessions took place, on average, twice weekly, for 55 minutes. Memory intervention included nineteen computer-based exercises customized to focus on memory loss. The specificity of memory training was very clear;memory training produced significant effects (F(3,51) = 2.81, p = 0.05) on memory performance, especially after 6 months of training, while other outcome measures showed no effects as predicted. Based on the results, it can be concluded that interventions targeting cognition and memory in the oldest-old MCI population can significantly improve memory function and reduce cognitive deficits. 展开更多
关键词 Memory COGNITIVE Training Cognition SENIORS Aging mild COGNITIVE IMPAIRMENT mci
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Study on EEG power and coherence in patients with mild cognitive impairment during working memory task 被引量:2
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作者 JIANG Zheng-yan(蒋正言) 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2005年第12期1213-1219,共7页
To investigate the features of electroencephalography (EEG) power and coherence at rest and during a working memory task of patients with mild cognitive impairment (MCI). Thirty-five patients (17 males, 18 female... To investigate the features of electroencephalography (EEG) power and coherence at rest and during a working memory task of patients with mild cognitive impairment (MCI). Thirty-five patients (17 males, 18 females; 52-71 years old) and 34 sex- and age-matched controls (17 males, 17 females; 51-63 years old) were recruited in the present study. Mini-Mental State Examination (MMSE) of 35 patients with MCI and 34 normal controls revealed that the scores of MCI patients did not differ significantly from those of normal controls (P〉0.05). Then, EEGs at rest and during working memory task with three levels of working memory load were recorded. The EEG power was computed over 10 channels: fight and left frontal (F3, F4), central (C3, C4), parietal (P3, P4), temporal (T5, T6) and occipital (O1, O2); inter-hemispheric coherences were computed from five electrode pairs of F3-F4, C3-C4, P3-P4, T5-T6 and O1-O2 for delta (1.0-3.5 Hz), theta (4.0-7.5 Hz), alpha-1 (8.0-10.0 Hz), alpha-2 (10.5-13.0 Hz), beta-1 (13.5-18.0 Hz) and beta-2 (18.5-30.0 Hz) frequency bands. All values of the EEG power of MCI patients were found to be higher than those of normal controls at rest and during working memory tasks. Furthermore, the values of EEG power in the theta, alpha-1, alpha-2 and beta-1 bands of patients with MCI were significantly high (P〈0.05) in comparison with those of normal controls. Correlation analysis indicated a significant negative correlation between the EEG powers and MMSE scores. In addition, during working memory tasks, the EEG coherences in all bands were significantly higher in the MCI group in comparison with those in the control group (P〈0.05). However, there was no significant difference in EEG coherences between two groups at rest. These findings comprise evidence that MCI patients have higher EEG power at rest, and higher EEG power and coherence during working conditions. It suggests that MCI may be associated with compensatory processes at rest and during working memory tasks. Moreover, failure of normal cortical connections may be exist in MCI patients. 展开更多
关键词 mild cognitive impairment mci Electroencephalography (EEG) Spectral power COHERENCE Working memory
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Usefulness of the Japanese version of Rapid Dementia Screening Test for mild cognitive impairment in older patients with cardiovascular disease:a cross-sectional study 被引量:1
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作者 Takuji Adachi Yuki Tsunekawa +1 位作者 Akihito Matsuoka Daisuke Tanimura 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2021年第4期245-251,共7页
BACKGROUND Cognitive decline is common among older patients with cardiovascular disease(CVD) and can decrease their self-management abilities. However, the instruments for identifying mild cognitive impairment(MCI) ar... BACKGROUND Cognitive decline is common among older patients with cardiovascular disease(CVD) and can decrease their self-management abilities. However, the instruments for identifying mild cognitive impairment(MCI) are not always feasible in clinical practice. Therefore, this study evaluated whether MCI could be detected using the Japanese version of the Rapid Dementia Screening Test(RDST-J), which is a simple screening tool for identifying cognitive decline.METHODS This retrospective single-center study included patients who were ≥ 65 years old and hospitalized because of CVD.Patients with a pre-hospitalization diagnosis of dementia were excluded. Each patient's cognitive function had been measured at discharge using the RDST-J and the Japanese version of the Montreal Cognitive Assessment(Mo CA-J), which is a standard tool for MCI screening. The correlation between the two scores was evaluated using Spearman's rank correlation coefficient. Receiver operating characteristic(ROC) analysis was also to evaluate whether the RDST-J could identify MCI, which was defined as a Mo CA-J score of ≤ 25 points.RESULTS The study included 78 patients(mean age: 77.2 ± 8.9 years). The RDST-J and Mo CA-J scores were strongly correlated(r = 0.835, P < 0.001). The ROC analysis revealed that an RDST-J score of ≤ 9 points provided 75.4% sensitivity and 95.2% specificity for identifying MCI, with an area under the curve of 0.899(95% CI: 0.835-0.964). The same cut-off value was identified when excluding patients with a high probability of dementia(RDST-J score of ≤ 4 points).CONCLUSIONS The RDST-J may be a simple and effective tool for identifying MCI in older patients with CVD. 展开更多
关键词 CVD mci Usefulness of the Japanese version of Rapid Dementia Screening Test for mild cognitive impairment in older patients with cardiovascular disease:a cross-sectional study
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Neurophysiological Biomarker of Mild Cognitive Impairment
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作者 Wilfried Dimpfel 《Advances in Alzheimer's Disease》 2014年第2期64-77,共14页
Mild cognitive impairment is sometimes regarded as related to aging. However, statistically every second case turns into full dementia, which still is resistant to any treatment. It is therefore desir-able to recogniz... Mild cognitive impairment is sometimes regarded as related to aging. However, statistically every second case turns into full dementia, which still is resistant to any treatment. It is therefore desir-able to recognize deviations from normality as early as possible. This might be feasible by using quantitative EEG analysis in the presence of mental work. The present retrospective data analysis revealed a new quantitative biomarker indicating the degree of impairment. Current source density was calculated from 16 channel EEG using CATEEM?? software. Four different conditions were analyzed: relaxed state, performing a d2-concentration test, a calculation performance test and a memory test for 5 min each. Subjects older than 40 years were divided into two groups according to their DemTect score: 13 - 18 (HC;n = 44) or 8 - 12 (MCI;n = 45). Spectral power was chopped into six frequency ranges (delta, theta, alpha 1, alpha 2, beta 1 and beta 2). Average spectral power was enhanced in the MCI group in comparison to healthy subjects with respect to delta (p = 0.05) during relaxed state when all electrode positions were regarded. With respect to EEG recording during performance of three different psychometric tests it was recognized that mainly spectral changes during performance of the d2-concentration test were related to mild cognitive impairment. With regard to all electrode positions statistically significantly lower spectral power values were reached during the d2-test for delta (p = 0.001), theta (p = 0.0001) and alpha 1 waves (p = 0.08) in impaired subjects in comparison to healthy subjects. Regarding regions of interest increases of delta and theta power were seen in the fronto-temporal brain during performance of the d2-concentration test. These increases disappeared when looking at MCI data. In the centro-parietal region decreases of alpha and beta 1 power emerged, which were even larger in MCI subjects. No MCI-dependent changes were observed in the other two tests. A correlation was found between psychometric performance of the d2-test and the DemTect score (r = 0.51). MCI subjects had statistically significant worse performance in all three mental challenges in comparison to healthy volunteers. It is concluded that MCI can be characterized at an early stage by EEG recording in the relaxed state. High spectral delta and theta power in general and specifically at fronto- temporal electrode positions (especially at T3) was recognized as a biomarker for MCI. A DemTect score of 8-12 was validated as indicative for MCI. 展开更多
关键词 DemTect COGNITION PSYCHOMETRY EEG Source Density mild Cognitive IMPAIRMENT (mci) Alzheimer’s Disease CATEEM
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Nine Months of Memory Training Increases Cognistat Measured Memory in 79 - 89 Year-Old Mild Cognitively Impaired Individuals
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作者 Peter A. Magaro Bruce Brotter Mariyam Jalees 《Advances in Aging Research》 2015年第3期79-88,共10页
The effects of a memory training paradigm on performance across multiple cognitive domains, measured via the Cognistat, in 70 - 89 year-old individuals with mild cognitive impairment (MCI), were examined. Memory train... The effects of a memory training paradigm on performance across multiple cognitive domains, measured via the Cognistat, in 70 - 89 year-old individuals with mild cognitive impairment (MCI), were examined. Memory training sessions were conducted on average twice weekly, for 55 minutes each session, for 9 months. Across the testing period, Cognistat-measured memory increased relative to performance in other cognitive domains. Additionally, performance on non-memory measures remained stable or declined. Thus, memory training in older adult, MCI individuals may result in improved memory, but not in improvement in other, non-memory, cognitive domains. Results replicate previous work examining “oldest-old” individuals ranging in age from 90 to 99 years old at the time of study start. 展开更多
关键词 Older Adult mild COGNITIVE IMPAIRMENT mci Cognistat COGNITIVE Training MEMORY
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