A reappraisal of long-latency abdominal muscle reflexes in patients with propriospinal myoclonus

Authors

  • Samar S. Ayache MD,

    1. Service de Physiologie—Explorations Fonctionnelles, Hôpital Henri Mondor, APHP, Créteil, France
    2. EA 4391, Faculté de Médecine de Créteil, Université Paris-Est-Créteil, Créteil, France
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  • Rechdi Ahdab MD,

    1. Service de Physiologie—Explorations Fonctionnelles, Hôpital Henri Mondor, APHP, Créteil, France
    2. EA 4391, Faculté de Médecine de Créteil, Université Paris-Est-Créteil, Créteil, France
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  • Pierre Brugières MD,

    1. Service de Neuroradiologie, Hôpital Henri Mondor, APHP, Créteil, France
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  • Jean-François Ejzenbaum MD,

    1. Service de Neurologie, Hôpital Henri Mondor, APHP, Créteil, France
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  • François-Jérôme Authier MD, PhD,

    1. Centre de référence des maladies rares neuromusculaires, Hôpital Henri Mondor, APHP, Créteil, France
    2. INSERM U955-E10, Université Paris-Est-Créteil, Créteil, France
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  • Gilles Fénelon MD, PhD,

    1. Service de Neurologie, Hôpital Henri Mondor, APHP, Créteil, France
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  • Jean-Pascal Lefaucheur MD, PhD

    Corresponding author
    1. Service de Physiologie—Explorations Fonctionnelles, Hôpital Henri Mondor, APHP, Créteil, France
    2. EA 4391, Faculté de Médecine de Créteil, Université Paris-Est-Créteil, Créteil, France
    3. Centre de référence des maladies rares neuromusculaires, Hôpital Henri Mondor, APHP, Créteil, France
    • Service Physiologie, Explorations Fonctionnelles, Hôpital Henri Mondor, 51 avenue de Lattre de Tassigny, 94010 Créteil cedex, France
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  • Relevant conflicts of interest/financial disclosures: Nothing to report.

    Full financial disclosures and author roles can be found in the online version of this article

Abstract

Background:

We report 3 patients with typical clinical and electrophysiological characteristics of propriospinal myoclonus propagating from a thoracic spine generator.

Methods:

In these patients, the pattern of recruitment of long-latency electromyographic reflexes in abdominal muscles was studied in response to various stimuli.

Results:

Abdominal reflex latency varied from 60 to 140 ms depending on stimulus location. Latency increased from magnetic stimulation of the thoracic spine to electrical stimulation of the supraorbital nerve, electrical stimulation of the median nerve, and magnetic stimulation of the motor cortex.

Conclusions:

Long-latency abdominal reflex jerks are probably controlled by the brain stem to propriospinal system projections in patients with propriospinal myoclonus. The stereotyped pattern of recruitment of these reflexes could be of clinical utility to differentiate organic propriospinal myoclonus from psychogenic or mimicked jerks. © 2011 Movement Disorder Society

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