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We investigated whether vagus nerve stimulation (VNS) induces a positive shift of slow cortical potentials (SCPs) in patients with >50% seizure reduction (responders) but not in non-responders. We analyzed routine clinical electroencephalograms (EEGs) from 24 patients who were undergoing seizure treatment by VNS. The patients were divided into 2 groups by hardware time constant (TC) of EEG: the TC 10-s group (10 patients) and TC 2-s group (14 patients). We compared SCPs at 5 electrodes (Cz and adjacent ones) between the 2 states of VNS: during stimulation and between stimulations. Seizure reduction was independently judged. Correlation between SCP (positivity or not) and seizure reduction (>50% or not) was estimated. In the TC 10-s group, the correlation between SCP and seizure reduction was significant (p<0.05) (i.e., both good results in 4 and both negative results in 5). In TC 2-s group, the correlation between SCP and seizure reduction was not significant (p=0.209). A positive shift of SCP recorded by using a TC of 10s could be a surrogate marker for VNS response. SCP could be a biomarker of good responders to VNS. Copyright © 2017 International Federation of Clinical Neurophysiology. Published by Elsevier B.V. All rights reserved.


Borgil Bayasgalan, Masao Matsuhashi, Tomoyuki Fumuro, Haruhiko Nohira, Naoki Nakano, Koji Iida, Masaya Katagiri, Akihiro Shimotake, Riki Matsumoto, Takayuki Kikuchi, Takeharu Kunieda, Amami Kato, Ryosuke Takahashi, Akio Ikeda. We could predict good responders to vagus nerve stimulation: A surrogate marker by slow cortical potential shift. Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology. 2017 Sep;128(9):1583-1589

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PMID: 28709124

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