Objective： To investigate functional connectivity within default mode network （DMN） and ex-ecutive control network （ECN） in vascular cognitive im-pairment, no dementia （VCIND）. Methods： Twenty-eight VCIND pati...Objective： To investigate functional connectivity within default mode network （DMN） and ex-ecutive control network （ECN） in vascular cognitive im-pairment, no dementia （VCIND）. Methods： Twenty-eight VCIND patients and sixteen healthy controls were recruit-ed. A seed-based connectivity analysis was performed us-ing data from resting-state functional magnetic resonance imaging （fMRI）. Based on previous fndings, posteriorcingulate cortex （PCC） and dorsolateral prefrontal cortex （DLPFC） were chosen as regions of interest to study these networks.One-sample t-test and two-sample t-test were used for statistical analysis. Results： Compared with thecontrols, the VCIND group exhibited increased functional activity in such DMN regions as the left inferior temporal gyrus, parahippocampal gyrus, and medial frontal gyrus. The VCIND group had decreased functional connectivity of DMN at right superior frontal gyrus, left mid-cingu-late area, the medial part of left superior frontal gyrus, and bilateral medial frontal gyrus. The VCIND group also showed decreased functional connectivity of ECN pri-marilyat left inferior parietal gyrus, right angular gyrus, right middle occipital gyrus, and right middle frontal cor-tex. Conclusions： Increased functional connectivity with-in DMN and decreased functional connectivity within ECN suggested dysfunction of these two networks, which mightbe associated with the cognitive defcitsin patients with VCIND. These fndingsmay help usunderstandthe pathogenesis and clinical characteristics of VCIND.展开更多
目的：观察不同病变部位非痴呆性血管性认知损害（vascular cognitive impairment of non-dementia,VCIND）患者的P300,研究其神经心理学损害特征及可能的病理生理机制,同时探讨P300对早期血管性认知损害（VCI）的诊断价值.方法：对20...目的：观察不同病变部位非痴呆性血管性认知损害（vascular cognitive impairment of non-dementia,VCIND）患者的P300,研究其神经心理学损害特征及可能的病理生理机制,同时探讨P300对早期血管性认知损害（VCI）的诊断价值.方法：对20例皮质下缺血性VCIND患者、20例皮质缺血性VCIND患者及15例正常对照（NC）进行P300检测.结果：与NC组比较,皮质下缺血性VCIND组患者P300潜伏期延长[（366.85±26.43）ms vs（288.33±28.97）ms,P〈0.05],波幅降低[（9.46±1.47）μV vs （13.51±1.30）μV,P〈0.05] 与皮质缺血性VCIND组比较,皮质下缺血性VCIND组患者P300潜伏期延长[（366.85±26.43）ms vs（344.55±23.07）ms,P〈0.05],波幅比较差异无显著意义（P〉0.05）.结论：皮质下缺血性VClND组患者P300异常更为突出,与其神经心理学特征有关 P300潜伏期可能作为早期VCI的诊断参考指标之一.展开更多
文摘Objective： To investigate functional connectivity within default mode network （DMN） and ex-ecutive control network （ECN） in vascular cognitive im-pairment, no dementia （VCIND）. Methods： Twenty-eight VCIND patients and sixteen healthy controls were recruit-ed. A seed-based connectivity analysis was performed us-ing data from resting-state functional magnetic resonance imaging （fMRI）. Based on previous fndings, posteriorcingulate cortex （PCC） and dorsolateral prefrontal cortex （DLPFC） were chosen as regions of interest to study these networks.One-sample t-test and two-sample t-test were used for statistical analysis. Results： Compared with thecontrols, the VCIND group exhibited increased functional activity in such DMN regions as the left inferior temporal gyrus, parahippocampal gyrus, and medial frontal gyrus. The VCIND group had decreased functional connectivity of DMN at right superior frontal gyrus, left mid-cingu-late area, the medial part of left superior frontal gyrus, and bilateral medial frontal gyrus. The VCIND group also showed decreased functional connectivity of ECN pri-marilyat left inferior parietal gyrus, right angular gyrus, right middle occipital gyrus, and right middle frontal cor-tex. Conclusions： Increased functional connectivity with-in DMN and decreased functional connectivity within ECN suggested dysfunction of these two networks, which mightbe associated with the cognitive defcitsin patients with VCIND. These fndingsmay help usunderstandthe pathogenesis and clinical characteristics of VCIND.
