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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

302
Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
302

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Focal negative motor seizures: Multimodal evaluation.

Roberta Di Giacomo1, Rachele Colombo1,2, Laura Canafoglia1

  • 1Epilepsy Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy.

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|November 22, 2024
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Summary

Multimodal evaluation is key for diagnosing negative motor seizures (NMSs). This case highlights video-EEG, MEG, and MRI

Keywords:
focal akinetic seizureictal bradycardiaictal paralysisnegative motor areanegative motor seizuresvideo‐EEG polygraphy

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Area of Science:

  • Neurology
  • Epileptology
  • Neurophysiology

Background:

  • Negative motor seizures (NMSs) are infrequently documented with advanced neurophysiological techniques.
  • Accurate diagnosis of NMSs requires excluding mimics and guiding appropriate therapy.
  • Drug-resistant focal epilepsy can present with complex seizure semiologies, including NMSs.

Purpose of the Study:

  • To emphasize the importance of multimodal evaluation in diagnosing NMSs.
  • To present a case of drug-resistant focal epilepsy with NMSs.
  • To illustrate the utility of coregistered video-EEG, MEG, and MRI in characterizing NMSs.

Main Methods:

  • Case report of a 62-year-old male with drug-resistant focal epilepsy.
  • Utilized video-electroencephalography (EEG) with polygraphy, magnetoencephalography (MEG), and brain magnetic resonance imaging (MRI).
  • Analyzed ictal discharges, clinical semiology, and electromyographic (EMG) findings during NMSs.

Main Results:

  • Documented 182 focal NMSs with preserved awareness.
  • EEG revealed right frontocentral ictal discharges with EMG silence in left limb muscles.
  • MEG localized the epileptic zone to the right opercular region, correlating with MRI findings of type II cortical dysplasia.

Conclusions:

  • Multimodal evaluation is essential for accurate NMS diagnosis and management.
  • Coregistered techniques demonstrate the temporal link between ictal events and motor deficits.
  • This approach provides insights into the neurophysiological basis of NMSs and involved cortical areas.