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Related Experiment Videos

Electrodiagnostic findings in syringomyelia.

M A Nogués1, E Stålberg

  • 1Department of Clinical Neurophysiology, Raúl Carrea Institute for Neurological Research (FLENI), Montañeses 2325, 1428 Buenos Aires, Argentina. mnogues@fleni.org.ar

Muscle & Nerve
|November 24, 1999
PubMed
Summary

This study identifies specific electromyographic (EMG) activities and reflex responses in syringomyelia patients. These findings offer more precise electrodiagnosis for syringomyelia than traditional methods.

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Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • Syringomyelia diagnosis often relies on nonspecific electrodiagnostic abnormalities.
  • There is a need for more specific electrophysiological markers.

Purpose of the Study:

  • To describe distinct spontaneous electromyographic (EMG) activities and reflex responses in syringomyelia.
  • To evaluate their utility in improving the electrodiagnosis of syringomyelia.

Main Methods:

  • Studied 43 patients diagnosed with syringomyelia.
  • Utilized four-channel surface EMG and recorded long-latency responses (LLR) to median and tibial nerve stimulation.

Main Results:

  • Observed various spontaneous EMG activities: continuous motor unit activity (CMUA) in 18 patients, synchronous motor unit potentials (SMUP) in 10, respiratory synkinesis (RS) in 5, and myokymic discharges in 4.

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  • Detected LLRs (55-150 ms latency) in 14 patients.
  • Demonstrated significant variability in EMG findings among patients.

    • Conclusions:

    • Syringomyelia presents with diverse spontaneous EMG activities and reflex responses.
    • Increased spinal motor neuron excitability is a likely underlying mechanism.
    • These specific findings enhance the electrodiagnostic specificity for syringomyelia.