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Carbamazepine reduces short-interval interhemispheric inhibition in healthy humans


Sommer, Martin; Gileles, Elena; Knappmeyer, Kathrin; Rothkegel, Holger; Polanía, Rafael; Paulus, Walter (2012). Carbamazepine reduces short-interval interhemispheric inhibition in healthy humans. Clinical Neurophysiology, 123(2):351-357.

Abstract

OBJECTIVE: We sought to elucidate the influence of centrally active drugs on interhemispheric inhibition (IHI) between primary motor cortices in healthy humans.
METHODS: We therefore studied IHI before and 2h after intake of a single oral dose of carbamazepine, dextrometorphane, lorazepam, or placebo and compared it with the well known results for short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF). Drugs were tested in separate sessions and in random order.
RESULTS: While SICI and ICF were not altered by carbamazepine, IHI was reduced at the interstimulus interval of 8 ms. Dextrometorphane tended to enhance SICI and to reduce ICF and had no effect on IHI. Lorazepam reduced ICF as expected and enhanced IHI at the long intervals of 50 and 80ms. A moderate trend for interhemispheric facilitation was inconsistently observed at the interval 2 ms and blocked by carbamazepine. In addition, carbamazepine increased the motor threshold.
CONCLUSIONS: We conclude that circuits mediating short interstimulus intervals of IHI are susceptible to sodium channel blockade.
SIGNIFICANCE: The results increase our knowledge of interhemispheric transmission.

Abstract

OBJECTIVE: We sought to elucidate the influence of centrally active drugs on interhemispheric inhibition (IHI) between primary motor cortices in healthy humans.
METHODS: We therefore studied IHI before and 2h after intake of a single oral dose of carbamazepine, dextrometorphane, lorazepam, or placebo and compared it with the well known results for short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF). Drugs were tested in separate sessions and in random order.
RESULTS: While SICI and ICF were not altered by carbamazepine, IHI was reduced at the interstimulus interval of 8 ms. Dextrometorphane tended to enhance SICI and to reduce ICF and had no effect on IHI. Lorazepam reduced ICF as expected and enhanced IHI at the long intervals of 50 and 80ms. A moderate trend for interhemispheric facilitation was inconsistently observed at the interval 2 ms and blocked by carbamazepine. In addition, carbamazepine increased the motor threshold.
CONCLUSIONS: We conclude that circuits mediating short interstimulus intervals of IHI are susceptible to sodium channel blockade.
SIGNIFICANCE: The results increase our knowledge of interhemispheric transmission.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:03 Faculty of Economics > Department of Economics
Dewey Decimal Classification:330 Economics
Language:English
Date:2012
Deposited On:11 Nov 2013 10:23
Last Modified:05 Apr 2016 17:07
Publisher:Elsevier
ISSN:1388-2457
Publisher DOI:https://doi.org/10.1016/j.clinph.2011.07.027
PubMed ID:21862399

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