Epileptic negative myoclonus and brief asymmetric tonic seizures. A supplementary sensorimotor area involvement for both negative and positive motor phenomena

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Abstract

Epileptic negative myoclonus (ENM) is an epileptic motor dysfunction characterised by brief lapses of postural tone provoked by paroxysmal cortical discharges. We report the electrophysiological and video-polygraphic findings in a patient presenting with the unusual association of ENM and brief asymmetric tonic-postural seizures of cryptogenetic origin. Focal EMG silent periods in the left deltoid muscle (mean duration 81.2 ± 16.4 ms), time-locked with vertex spikes were present. The time lag between spikes and ENM was 33.1 ± 4.6 ms. We suggest the involvement of mesial frontal areas in the genesis of both negative and positive motor phenomena.

Original languageEnglish
Pages (from-to)163-167
Number of pages5
JournalEpileptic Disorders
Volume2
Issue number3
Publication statusPublished - 2000

Keywords

  • Epileptic negative myoclonus
  • Frontal lobe epilepsy
  • Seizure semiology
  • SMA seizures

ASJC Scopus subject areas

  • Clinical Neurology

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