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Inhibitory motor seizures: correlation with centroparietal structural and functional abnormalities

B Abou-Khalil1, T Fakhoury, M Jennings

  • 1Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee 37212, USA.

Acta Neurologica Scandinavica
|February 1, 1995
PubMed
Summary

Focal inhibitory motor seizures, or ictal paralysis, are linked to centroparietal brain activity. Neuroimaging studies suggest a centroparietal epileptogenic focus in patients experiencing these seizures.

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Area of Science:

  • Neurology
  • Epileptology
  • Neuroimaging

Background:

  • Focal inhibitory motor seizures, characterized by ictal paralysis, are a rare epilepsy manifestation.
  • Differentiating these seizures from other neurological events like transient ischemic attacks and migraine is crucial for accurate diagnosis and management.

Observation:

  • This study evaluated 8 patients (6 adults, 2 children) experiencing focal inhibitory motor seizures over a 4-year period.
  • Paresthesias were reported at seizure onset in all patients, with focal clonic activity following paralysis in 4.
  • Electroencephalography-continuous video-EEG monitoring (EEG-CCTV) in 2 patients revealed that ictal paralysis correlated with ictal discharges originating from the centroparietal region.

Findings:

  • Magnetic Resonance Imaging (MRI) identified centroparietal structural lesions in 6 out of 8 patients.

Related Experiment Videos

  • Positron Emission Tomography (PET) revealed right centroparietal hypometabolism in one patient with a normal MRI.
  • Neuroimaging studies, including MRI and in two cases ictal EEG, consistently suggested a centroparietal epileptogenic focus in affected individuals.

    • Implications:

    • The findings highlight the importance of considering a centroparietal epileptogenic zone in patients with focal inhibitory motor seizures.
    • Neuroimaging techniques like MRI and PET, alongside ictal EEG, are valuable tools for identifying the seizure focus.
    • Accurate localization of the epileptogenic zone is essential for appropriate clinical management and differentiating these seizures from other neurological conditions.