Lamotrigine and levetiracetam exert a similar modulation of TMS-evoked EEG potentials

Article


Premoli, Isabella, Biondi, Andrea, Carlesso, Sara, Rivolta, D. and Richardson, Mark P. 2016. Lamotrigine and levetiracetam exert a similar modulation of TMS-evoked EEG potentials. Epilepsia. 58 (1), pp. 42-50.
AuthorsPremoli, Isabella, Biondi, Andrea, Carlesso, Sara, Rivolta, D. and Richardson, Mark P.
Abstract

Objective: Antiepileptic drug (AED) treatment failures may occur because there is insufficient drug in the brain or because of a lack of relevant therapeutic response. Until now there is no possibility to measure these factors. It has been recently shown that the combination of transcranial magnetic stimulation and electroencephalography (TMS-EEG) can measure the effects of drugs in healthy volunteers. TMS-evoked EEG potentials (TEPs) comprise a series of positive and negative deflections which can be specifically modulated by drugs with a well-known mode of action targeting inhibitory neurotransmission. Hence, we hypothesised that TMS-EEG can detect effects of two widely used AEDs, lamotrigine and levetiracetam, in healthy volunteers. Methods: Fifteen healthy subjects participated in a pseudo randomized, placebo-controlled, double-blind, crossover design, using a single oral dose of lamotrigine (300mg) and levetiracetam (3000mg). TEPs were recorded before and 120 min after drug intake and the effects of drugs on the amplitudes of TEP components were statistically evaluated.

Results: A non-parametric cluster-based permutation analysis of TEP amplitudes showed that both AEDs increased the amplitude of the negative potential at 45ms after stimulation (N45) and suppressed the positive peak at 180ms (P180). This is the first demonstration of AED-induced modulation of TMS-EEG measures.

Significance: Despite the different mechanism of action that lamotrigine and levetiracetam exert at molecular level, both AEDs impact the TMS-EEG response in a similar way. These TMS-EEG fingerprints observed in healthy subjects are candidate predictive markers of treatment response in patients on monotherapy with lamotrigine and levetiracetam.

Keywordselectroencephalography; epilepsy; pharmaco-TMS-EEG; AED; transcranial magnetic stimulation
JournalEpilepsia
Journal citation58 (1), pp. 42-50
ISSN0013-9580
1528-1167
Year2016
PublisherWiley
Publisher's version
License
CC BY
File Access Level
Repository staff only
Publisher's version
License
Digital Object Identifier (DOI)doi:10.1111/epi.13599
Web address (URL)https://doi.org/10.1111/epi.13599
Publication dates
Print03 Nov 2016
Publication process dates
Deposited25 Nov 2016
Accepted07 Oct 2016
Accepted07 Oct 2016
FunderMedical Research Council
Engineering and Physical Sciences Council
Maudsley NHS Foundation Trust
National Institute for Health Research
Wellcome Trust King's Clinical Research Facility
National Institute for Health Research Biomedical Research Centre and Dementia Unit
King's College London
Medical Research Council
Engineering and Physical Sciences Research Council
National Institute for Health Research
Maudsley NHS Foundation Trust
Wellcome Trust King's Clinical Research Facility
King's College London
National Institute for Health Research Biomedical Research Centre and Dementia Unit
Copyright information© 2016 The Authors. Epilepsia published by Wiley Periodicals, Inc. on behalf of International League Against Epilepsy. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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