Frontiers in Neuroscience:白质高信号引起的脑血管反应和功能连接异常导致认知衰退

2022-03-29 MedSci原创 MedSci原创

WMH 导致的左侧 MOG 的 CVR 下降左侧岛叶-MOG FC异常,是导致一般认知(MMSE 和 MoCA)和信息处理速度(TMT-A)差的原因。

流行病学研究显示,在72-96%的60岁以上的欧洲人和70%的50岁以上的中国人中可以观察到白质高信号(white matter hyperintensity, WMH)。越来越多的证据表明,心理健康负担对认知产生负向影响,主要表现在执行功能和信息加工速度上。严重的白质高信号也与中风、痴呆和死亡的发生率密切相关。然而,白质高信号负担引发认知障碍和血管事件的潜在机制仍然未知。更好地理解认知认知障碍与认知能力下降的联系机制至关重要。

Yun Xu等在Frontiers in Neuroscience杂志发表题为Abnormal Cerebrovascular Reactivity and Functional Connectivity Caused by White Matter Hyperintensity Contribute to Cognitive Decline的研究文章,探讨了脑血管反应(cerebrovascular reactivity, CVR)和功能连接(FC)对WMH相关认知衰退的影响,以及WMH、CVR、FC与认知衰退之间的确切关系。该研究得出结论严重的WMH可能导致局部CVR下降,进而导致FC异常,最终导致认知功能下降。

该研究应用rs-fMRI评估WMH-I、WMH-II和WMH-III人群的CVR和FC。调查了WMH负担与CVR、FC和认知功能下降之间的关系。

该研究共招募了 233 名 WMH 受试者,并根据 Fazekas 视觉评定量表分组将其分类为 WMH-I(n= 106), WMH-II (n= 72) 和 WMH-III (n= 55)。所有参与者都接受了神经心理学测试和多模式 MRI 扫描,包括 3D-T1 和静息状态功能磁共振成像 (rs-fMRI)。进一步探讨了 CVR 图和 FC 的变化。

具有较高 WMH 负担的受试者在左侧枕内侧回 (MOG) 中表现出较低的 CVR。

三组之间CVR差异

三组之间FC差异

以 MOG 为种子点的 FC 分析显示,随着 WMH 的加重,左侧岛叶、左侧顶叶下小叶和丘脑的 FC 发生异常变化。在调整了年龄、性别和教育年限后,系列中介分析显示,脑室周围白质高信号间接导致简易精神状态检查 (MMSE) 评分较差(间接效应:β = -0.1248,95% CI:-0.4689, −0188)、较差的蒙特利尔认知评估 (MoCA) 分数(间接影响:β = -0.1436, 95% CI:-0.4584,-0.0292),以及更长的跟踪测试 A 次数(TMT-A)(间接影响:β = 0.1837 , 95% CI: 0.0069, 0.8273),特别是由于左侧 MOG 的 CVR 较低和左侧岛叶-MOG FC 较高。

路径模型显示了白质高信号体积和认知功能之间的直接和间接关系

WMH 导致的左侧 MOG 的 CVR 下降左侧岛叶-MOG FC异常,是导致一般认知(MMSE 和 MoCA)和信息处理速度(TMT-A)差的原因。

原文出处

Yang D, Qin R, Chu L, et al. Abnormal Cerebrovascular Reactivity and Functional Connectivity Caused by White Matter Hyperintensity Contribute to Cognitive Decline. Front Neurosci. 2022;16:807585. Published 2022 Mar 4. doi:10.3389/fnins.2022.807585

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    2022-11-20 anminleiryan
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    2022-03-28 lsndxfj
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    2022-03-28 jichang
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