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Related Experiment Videos

Motor-evoked potentials: unusual findings.

Y Ugawa1, I Kanazawa

  • 1Department of Neurology, Graduate School of Medicine, University of Tokyo, Japan. ugawa-tky@umin.ac.jp

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|September 9, 1999
PubMed
Summary

Careful interpretation of motor evoked potentials (MEPs) is crucial in spastic paraparesis patients. Very high stimulation intensities can activate different descending tracts, complicating results and interpretation.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Spastic paraparesis involves corticospinal tract damage, making electrophysiological assessment challenging.
  • Motor evoked potentials (MEPs) are used to evaluate the integrity of the corticospinal tract.

Observation:

  • This study investigated rare MEP findings in three spastic paraparesis patients using high-intensity transcranial stimulation.
  • Unusual response latencies and activation sites were observed, particularly with very high stimulation intensities.

Findings:

  • High-intensity stimulation yielded variable responses, including D2 and D3 waves, suggesting activation at different levels (cerebral peduncle, foramen magnum).
  • In two patients, foramen magnum stimulation showed longer latencies than cortical stimulation, indicating involvement of slower descending tracts.

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  • Cortical stimulation activated the corticospinal tract, while spinal/foramen magnum stimulation activated other, slower tracts.

    • Implications:

    • The site of activation can vary significantly with high-intensity stimulation, complicating MEP interpretation.
    • The descending tracts contributing to EMG responses may differ between cortical and spinal stimulation in severe corticospinal tract damage.
    • Accurate interpretation of MEPs in patients with compromised corticospinal tracts requires careful consideration of stimulation parameters and potential alternative pathways.