颞叶癫痫发作期和发作后的意识障碍与增强的互信息
Ictal and Post Ictal Impaired Consciousness due to Enhanced Mutual Information in Temporal Lobe Epilepsy
摘要:
癫痫发作和同步化以复杂的方式相互关联。改变的同步性与部分性癫痫发作期间的意识丧失有关。然而,癫痫发作终止后意识改变的机制尚未得到很好的研究。在这项工作中,我们使用双变量互信息作为同步的措施,以了解中央颞叶发作癫痫发作期间和终止后的意识改变的神经相关。首先,我们比较了离散双变量互信息测度与幅度相关、相位同步、非线性相关和相干性,确定了互信息测度是一种鲁棒的同步测度。其次,我们通过主成分方法将MI扩展到两个以上的信号。对11例患者23次颞叶癫痫发作前、中、后的颅内脑电图(iEEG)应用扩展MI。在δ、θ、α、β和γ波段进行分析。在77%的复杂部分性癫痫发作中,在β和γ频带中的癫痫发作区(SOZ)通道中,MI朝向癫痫发作偏移高于癫痫发作的前半部分,而MI在癫痫发作开始或中间仍然高于相同频带中最少参与通道的偏移。同步似乎在SOZ外建立,逐渐扩散并在SOZ达到高潮,并保持在超过偏移的高度,导致82%的复杂部分性颞叶癫痫发作的意识受损。意识障碍的评分方法,以前应用于评估颞叶癫痫患者在癫痫发作期间相同。
英文摘要:
Seizure and synchronization are related to each other in complex manner. Altered synchrony has been implicated in loss of consciousness during partial seizures. However, the mechanism of altered consciousness following termination of seizures has not been studied well. In this work we used bivariate mutual information as a measure of synchronization to understand the neural correlate of altered consciousness during and after termination of mesial temporal lobe onset seizures. First, we have compared discrete bivariate mutual information (MI) measure with amplitude correlation (AC), phase synchronization (PS), nonlinear correlation and coherence, and established MI as a robust measure of synchronization. Next, we have extended MI to more than two signals by principal component method. The extended MI was applied on intracranial electroencephalogram (iEEG) before, during and after 23 temporal lobe seizures recorded from 11 patients. The analyses were carried out in delta, theta, alpha, beta and gamma bands. In 77% of the complex partial seizures MI was higher towards the seizure offset than in the first half of the seizure in the seizure onset zone (SOZ) channels in beta and gamma bands, whereas MI remained higher in the beginning or in the middle of the seizure than towards the offset across the least involved channels in the same bands. Synchronization seems built up outside the SOZ, gradually spread and culminated in SOZ and remained high beyond offset leading to impaired consciousness in 82% of the complex partial temporal lobe seizures. Consciousness impairment was scored according to a method previously applied to assess the same in patients with temporal lobe epilepsy during seizure.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。