Lamotrigine and valproic acid have different effects on motorcortical neuronal excitability

Xingbao Li; Raffaella Ricci; Charles H. Large; Berry Anderson; Ziad Nahas; Mark S. George

doi:10.1007/s00702-009-0195-z

Lamotrigine and valproic acid have different effects on motorcortical neuronal excitability

Xingbao Li, Raffaella Ricci, Charles H. Large, Berry Anderson, Ziad Nahas, Mark S. George

Psychiatry & Behavioral Sciences

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

To investigate different cortical effects of lamotrigine and valproic acid, 30 paid healthy adult men were given, in a randomized/blinded fashion on three separate days (separated by a week), either a single dose of lamotrigine 325 mg, or a single dose of valproic acid 1,250 mg, or placebo. Resting motor threshold (RMT), cortical silent period (CSP) and motor evoked potential recruitment curves (RC) were assessed at baseline and 3 h after administration of each medication (or placebo). Lamotrigine caused a significant increase (63.32 vs. 69.25) in the RMT, compared with an insignificant increase following valproic acid (62.50 vs. 63.35), and a decrease (62.60 vs. 62.36) following placebo (F _2,26 = 18.58, P < 0.0001). No significant difference in CSP was found between placebo and drugs (F _2,26 = 0.119, P > 0.05). RCs were significantly suppressed by lamotrigine (t = 2.07, P < 0.05) and enhanced by valproic acid (t = 2.39, P < 0.05). Lamotrigine and valproic acid have different effects on cortical neuronal excitability as demonstrated by TMS.

Original language	English (US)
Pages (from-to)	423-429
Number of pages	7
Journal	Journal of Neural Transmission
Volume	116
Issue number	4
DOIs	https://doi.org/10.1007/s00702-009-0195-z
State	Published - Apr 2009

Bibliographical note

Funding Information:
The authors would like to thank Dr Jeffrey Borckardt for running HLM analysis. This study was funded primarily by an unrestricted research grant from GlaxoSmithKline to Dr George, as well as from Center for Advanced Imaging Research and Brain Stimulation Laboratory infrastructure and resources. CHL is a full-time employee of GlaxoSmithKline S.p.A. None of the other authors have equity or financial conflicts. Drs Li and George had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Presented in abstract form at the annual meeting of American College of Neuropsychopharmacology, Hollywood, FL, USA, December 14, 2006 and the annual meeting of the Society of Biological Psychiatry, San Diego, CA, USA, May 21, 2007.

Keywords

Lamotrigine
Motorcortical excitability
Transcranial magnetic stimulation
Valproic acid

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title = "Lamotrigine and valproic acid have different effects on motorcortical neuronal excitability",

abstract = "To investigate different cortical effects of lamotrigine and valproic acid, 30 paid healthy adult men were given, in a randomized/blinded fashion on three separate days (separated by a week), either a single dose of lamotrigine 325 mg, or a single dose of valproic acid 1,250 mg, or placebo. Resting motor threshold (RMT), cortical silent period (CSP) and motor evoked potential recruitment curves (RC) were assessed at baseline and 3 h after administration of each medication (or placebo). Lamotrigine caused a significant increase (63.32 vs. 69.25) in the RMT, compared with an insignificant increase following valproic acid (62.50 vs. 63.35), and a decrease (62.60 vs. 62.36) following placebo (F 2,26 = 18.58, P < 0.0001). No significant difference in CSP was found between placebo and drugs (F 2,26 = 0.119, P > 0.05). RCs were significantly suppressed by lamotrigine (t = 2.07, P < 0.05) and enhanced by valproic acid (t = 2.39, P < 0.05). Lamotrigine and valproic acid have different effects on cortical neuronal excitability as demonstrated by TMS.",

keywords = "Lamotrigine, Motorcortical excitability, Transcranial magnetic stimulation, Valproic acid",

author = "Xingbao Li and Raffaella Ricci and Large, {Charles H.} and Berry Anderson and Ziad Nahas and George, {Mark S.}",

note = "Funding Information: The authors would like to thank Dr Jeffrey Borckardt for running HLM analysis. This study was funded primarily by an unrestricted research grant from GlaxoSmithKline to Dr George, as well as from Center for Advanced Imaging Research and Brain Stimulation Laboratory infrastructure and resources. CHL is a full-time employee of GlaxoSmithKline S.p.A. None of the other authors have equity or financial conflicts. Drs Li and George had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Presented in abstract form at the annual meeting of American College of Neuropsychopharmacology, Hollywood, FL, USA, December 14, 2006 and the annual meeting of the Society of Biological Psychiatry, San Diego, CA, USA, May 21, 2007.",

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AU - Anderson, Berry

AU - Nahas, Ziad

AU - George, Mark S.

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N2 - To investigate different cortical effects of lamotrigine and valproic acid, 30 paid healthy adult men were given, in a randomized/blinded fashion on three separate days (separated by a week), either a single dose of lamotrigine 325 mg, or a single dose of valproic acid 1,250 mg, or placebo. Resting motor threshold (RMT), cortical silent period (CSP) and motor evoked potential recruitment curves (RC) were assessed at baseline and 3 h after administration of each medication (or placebo). Lamotrigine caused a significant increase (63.32 vs. 69.25) in the RMT, compared with an insignificant increase following valproic acid (62.50 vs. 63.35), and a decrease (62.60 vs. 62.36) following placebo (F 2,26 = 18.58, P < 0.0001). No significant difference in CSP was found between placebo and drugs (F 2,26 = 0.119, P > 0.05). RCs were significantly suppressed by lamotrigine (t = 2.07, P < 0.05) and enhanced by valproic acid (t = 2.39, P < 0.05). Lamotrigine and valproic acid have different effects on cortical neuronal excitability as demonstrated by TMS.

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Lamotrigine and valproic acid have different effects on motorcortical neuronal excitability

Abstract

Bibliographical note

Keywords

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