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额叶癫痫中癫痫网络的患者特异性连接模式。

Patient-specific connectivity pattern of epileptic network in frontal lobe epilepsy.

作者信息

Luo Cheng, An Dongmei, Yao Dezhong, Gotman Jean

机构信息

Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada ; Key Laboratory for Neuroinformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.

Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada ; Department of Neurology, West China Hospital of Sichuan University, Chengdu, China.

出版信息

Neuroimage Clin. 2014 Apr 16;4:668-75. doi: 10.1016/j.nicl.2014.04.006. eCollection 2014.

Abstract

There is evidence that focal epilepsy may involve the dysfunction of a brain network in addition to the focal region. To delineate the characteristics of this epileptic network, we collected EEG/fMRI data from 23 patients with frontal lobe epilepsy. For each patient, EEG/fMRI analysis was first performed to determine the BOLD response to epileptic spikes. The maximum activation cluster in the frontal lobe was then chosen as the seed to identify the epileptic network in fMRI data. Functional connectivity analysis seeded at the same region was also performed in 63 healthy control subjects. Nine features were used to evaluate the differences of epileptic network patterns in three connection levels between patients and controls. Compared with control subjects, patients showed overall more functional connections between the epileptogenic region and the rest of the brain and higher laterality. However, the significantly increased connections were located in the neighborhood of the seed, but the connections between the seed and remote regions actually decreased. Comparing fMRI runs with interictal epileptic discharges (IEDs) and without IEDs, the patient-specific connectivity pattern was not changed significantly. These findings regarding patient-specific connectivity patterns of epileptic networks in FLE reflect local high connectivity and connections with distant regions differing from those of healthy controls. Moreover, the difference between the two groups in most features was observed in the strictest of the three connection levels. The abnormally high connectivity might reflect a predominant attribute of the epileptic network, which may facilitate propagation of epileptic activity among regions in the network.

摘要

有证据表明,局灶性癫痫可能除了涉及局灶区域外,还涉及脑网络功能障碍。为了描绘这种癫痫网络的特征,我们收集了23例额叶癫痫患者的脑电图/功能磁共振成像(EEG/fMRI)数据。对于每位患者,首先进行EEG/fMRI分析以确定对癫痫棘波的血氧水平依赖(BOLD)反应。然后选择额叶中的最大激活簇作为种子,以在fMRI数据中识别癫痫网络。还对63名健康对照者进行了以相同区域为种子的功能连接分析。使用九个特征来评估患者和对照者在三个连接水平上癫痫网络模式的差异。与对照者相比,患者在致痫区域与大脑其余部分之间总体上表现出更多的功能连接和更高的偏侧性。然而,显著增加的连接位于种子附近,但种子与远处区域之间的连接实际上减少了。比较有发作间期癫痫放电(IEDs)和无IEDs的fMRI扫描,患者特异性的连接模式没有明显变化。这些关于额叶癫痫中癫痫网络患者特异性连接模式的发现反映了局部高连接性以及与健康对照者不同的与远处区域的连接。此外,在三个连接水平中最严格的水平上观察到两组在大多数特征上的差异。异常高的连接性可能反映了癫痫网络的一个主要属性,这可能促进癫痫活动在网络区域之间的传播。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b208/4053646/fba39f90c43a/gr1.jpg

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