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终末期肾病患者认知障碍相关的神经血管耦联功能障碍。

Neurovascular coupling dysfunction in end-stage renal disease patients related to cognitive impairment.

机构信息

Department of Medical Imaging, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, China.

Department of Medical Imaging, Hospital of Shaanxi Nuclear Geology, Xianyang, China.

出版信息

J Cereb Blood Flow Metab. 2021 Oct;41(10):2593-2606. doi: 10.1177/0271678X211007960. Epub 2021 Apr 14.

Abstract

We aimed to investigate the neurovascular coupling (NVC) dysfunction in end-stage renal disease (ESRD) patients related with cognitive impairment. Twenty-five ESRD patients and 22 healthy controls were enrolled. To assess the NVC dysfunctional pattern, resting-state functional MRI and arterial spin labeling were explored to estimate the coupling of spontaneous neuronal activity and cerebral blood perfusion based on amplitude of low-frequency fluctuation (ALFF)-cerebral blood flow (CBF), fractional ALFF (fALFF)-CBF, regional homogeneity (ReHo)-CBF, and degree centrality (DC)-CBF correlation coefficients. Multivariate partial least-squares correlation and mediation analyses were used to evaluate the relationship among NVC dysfunctional pattern, cognitive impairment and clinical characteristics. The NVC dysfunctional patterns in ESRD patients were significantly decreased in 34 brain regions compared with healthy controls. The decreased fALFF-CBF coefficients in the cingulate gyrus (CG) were associated positively with lower kinetic transfer/volume urea (Kt/V) and lower short-term memory scores, and were negatively associated with higher serum urea. The relationship between Kt/V and memory deficits of ESRD patients was partially mediated by the fALFF-CBF alteration of the CG. These findings reveal the NVC dysfunction may be a potential neural mechanism for cognitive impairment in ESRD. The regional NVC dysfunction may mediate the impact of dialysis adequacy on memory function.

摘要

我们旨在研究与认知障碍相关的终末期肾病(ESRD)患者的神经血管耦合(NVC)功能障碍。共纳入 25 名 ESRD 患者和 22 名健康对照者。为了评估 NVC 功能障碍模式,我们探索了静息态功能磁共振成像和动脉自旋标记,以基于低频波动(ALFF)-脑血流(CBF)、分数低频波动(fALFF)-CBF、局部一致性(ReHo)-CBF 和度中心度(DC)-CBF 相关系数来估计自发神经元活动与脑血流的耦合。采用多元偏最小二乘法相关性和中介分析来评估 NVC 功能障碍模式、认知障碍与临床特征之间的关系。与健康对照组相比,ESRD 患者的 34 个脑区的 NVC 功能障碍模式显著降低。扣带回(CG)的 fALFF-CBF 系数降低与较低的动力学转移/体积尿素(Kt/V)和较低的短期记忆评分呈正相关,与较高的血清尿素呈负相关。ESRD 患者 Kt/V 与记忆缺陷之间的关系部分由 CG 的 fALFF-CBF 改变介导。这些发现表明,NVC 功能障碍可能是 ESRD 患者认知障碍的潜在神经机制。区域性 NVC 功能障碍可能介导透析充分性对记忆功能的影响。

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