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Related Experiment Videos

Soleus H-reflex to S1 nerve root stimulation.

Y Zhu1, A Starr, S Haldeman

  • 1Department of Neurology, University of California, Irvine, USA. zhuyu@vax.cs.hscsyr.edu

Electroencephalography and Clinical Neurophysiology
|September 26, 2000
PubMed
Summary

The H-reflex to S1 nerve root stimulation reliably measures spinal cord conduction, unaffected by peripheral nerve issues. This method assesses proximal afferents, anterior horn cells, and ventral roots for neurological health.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • The H-reflex is a valuable tool for assessing neural pathways.
  • Evaluating conduction within the spinal canal, including proximal nerve roots, is crucial for diagnosing neurological conditions.

Purpose of the Study:

  • To investigate the reliability of the H-reflex elicited by stimulating the S1 nerve root at the cauda equina.
  • To assess the H-M interval as a measure of conduction within the spinal canal.

Main Methods:

  • H-reflexes were elicited in normal subjects via electrical and magnetic stimulation of proximal nerve roots at the cauda equina.
  • The H-M interval was measured from S1 nerve root stimulation at the S1 foramen.
  • Conduction velocities were estimated using cadaveric S1 nerve root length.

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Main Results:

  • The H-M interval to S1 nerve root stimulation was 6.8 +/- 0.33 ms.
  • Side-to-side differences in the H-M interval were minimal (0.16 +/- 0.13 ms).
  • Sciatic nerve compression/ischemia abolished the H-reflex from tibial nerve stimulation but not S1 root stimulation.

Conclusions:

  • The H-M interval to S1 root stimulation provides a reliable measure of conduction within the spinal canal.
  • This method effectively assesses proximal afferents, anterior horn cells, and ventral roots.
  • The findings support the use of S1 root stimulation for evaluating spinal neural pathways.