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[Transcranial magnetic stimulation]

S Tsuji1

  • 1Department of Neurology, University of Occupational and Environmental Health, School of Medicine.

Rinsho Shinkeigaku = Clinical Neurology
|December 1, 1994
PubMed
Summary
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Transcranial magnetic stimulation (TMS) offers a novel neurophysiological assessment of central motor pathways. Reduced motor evoked potential (MEP) amplitude ratios correlate with hyperreflexia, indicating TMS

Area of Science:

  • Neurophysiology
  • Neuroscience
  • Motor Pathway Assessment

Context:

  • Transcranial magnetic stimulation (TMS) is an emerging technique for examining central motor pathways.
  • Clinical applications reveal correlations between reduced motor evoked potential (MEP)/M wave amplitude ratios and hyperreflexia.
  • The inhibitory period (IP) following TMS is primarily mediated by motor cortex inhibitory processes.

Purpose:

  • To investigate the neurophysiological characteristics of central motor pathways using TMS.
  • To explore the clinical utility of MEP parameters in conditions like hyperreflexia.
  • To elucidate the mechanisms underlying the inhibitory period (IP) and its modulation.

Summary:

  • Reduced MEP/M wave amplitude ratio shows higher correlation with hyperreflexia than delayed MEP onset latency.

Related Experiment Videos

  • The duration of the inhibitory period (IP) is independent of MEP amplitude, distribution, or voluntary contraction severity, suggesting cortical origin.
  • Ipsilateral motor cortex stimulation preceding contralateral stimulation shortens IP and increases MEP amplitude; sensory cortex stimulation suppresses C response in myoclonus patients.

    • Impact:

    • TMS provides insights into pyramidal tract integrity and sensory pathway modulation.
    • Demonstrates the utility of TMS in diagnosing spinal cord/root lesions and evaluating sympathetic nerve function.
    • Highlights TMS' potential for understanding and potentially treating neurological disorders affecting motor control.