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Segmental Reflex, Long Latency Reflex, and Mixed Nerve Silent Period in Dystonia

Published online by Cambridge University Press:  13 November 2023

Ayşegül Gündüz Open the ORCID record for Ayşegül Gündüz [Opens in a new window] ,
Damla Çetinkaya Tezer ,
Bengi Gül Türk  and
Meral E. Kızıltan
Ayşegül Gündüz*
Affiliation:
Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Neurology, Istanbul, Turkey
Damla Çetinkaya Tezer
Affiliation:
Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Neurology, Istanbul, Turkey
Bengi Gül Türk
Affiliation:
Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Neurology, Istanbul, Turkey
Meral E. Kızıltan
Affiliation:
Istanbul University-Cerrahpasa, Cerrahpasa Medical Faculty, Department of Neurology, Istanbul, Turkey
*
Corresponding author: A. Gündüz; Email: [email protected]
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Abstract

We hypothesized that “long latency reflexes” (LLRs), associated segmental reflex (SR), and mixed nerve silent periods (MnSPs) recorded on the distal upper extremity muscles would behave differently in patients with cervical dystonia and focal hand dystonia. We enrolled patients with cervical dystonia, generalized dystonia, focal hand dystonia, and healthy individuals. We recorded SR, LLRs, and MnSPs. The mean amplitude of SR on the affected side of focal hand dystonia was significantly lower (p = 0.010). The parameters related to LLRs and MnSPs were not different between groups. We suggest, using SR, LLRs, and MnSPs, we could not show an electrophysiological signature specific to dystonia.

Résumé

RÉSUMÉ

La dystonie ET les réflexes segmentaires, les réflexes de longue latence et les périodes de silence.

L’hypothèse de départ était que les réflexes de longue latence (RLL), les réflexes segmentaires (RS) associés et les périodes de silence des nerfs mixtes (PSNM), enregistrés sur les muscles distaux des membres supérieurs réagissaient de manière différente dans la dystonie cervicale et dans la dystonie focale de la main. Des patients souffrant de dystonie cervicale, de dystonie généralisée ou de dystonie focale de la main ainsi que des témoins en bonne santé ont participé à l’étude, puis il y a eu enregistrement des RS, des RLL et des PSNM. L’amplitude moyenne des RS du côté affecté chez les sujets atteints de dystonie focale de la main était significativement plus faible (p = 0,010) que chez les autres sujets. Par contre, les paramètres relatifs aux RLL et aux PSNM ne différaient pas d’un groupe ou à l’autre. Aussi sommes-nous d’avis qu’il n’était pas possible démontrer l’existence d’une signature électrophysiologique spécifique de la dystonie, fondée sur les ST, les RLL et les PSNM.

Keywords

Dystoniafocal hand dystoniasegmental reflexlong latency reflexmixed nerve silent period
Type
Brief Communication
Information
Canadian Journal of Neurological Sciences , Volume 51 , Issue 5 , September 2024 , pp. 693 - 697
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of Canadian Neurological Sciences Federation

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