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[Nerve conduction measurement based on lumbosacral evoked potentials].

T Fujiwara1, K Seko

  • 1College of Medical Technology, Kyoto University.

Rinsho Byori. the Japanese Journal of Clinical Pathology
|May 1, 1990
PubMed
Summary

This study measured lumbosacral evoked potentials (EP) to assess nerve conduction velocity in normal subjects, epileptics, and SMON patients. Reduced nerve conduction velocity was observed in long-term anticonvulsant users and younger SMON patients.

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Area of Science:

  • Neurophysiology
  • Clinical Electrophysiology

Context:

  • Lumbosacral evoked potentials (EP) are crucial for evaluating sensory nerve function.
  • Assessing nerve conduction velocity (NCV) aids in diagnosing neurological disorders.

Purpose:

  • To determine the site of maximum amplitude for lumbosacral EP.
  • To calculate entire nerve conduction velocity (ENCV) using posterior tibial nerve stimulation.
  • To compare ENCV in normal subjects, epileptic patients on anticonvulsants, and subacute myelo-optico-neuropathy (SMON) patients.

Summary:

  • EPs were recorded from the lower lumbar to thoracic levels in 27 normal subjects, 37 epileptic patients, and 22 SMON patients.
  • Maximum EP amplitude typically occurred 10 cm above the Jacoby line (around L1/T12).
  • Mean ENCV was calculated using N21 latency, showing reduced values in epileptic patients with long-term anticonvulsant use or poor seizure control, and in SMON patients under 60.

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Impact:

  • Establishes normative data for lumbosacral EP amplitude and ENCV.
  • Highlights the impact of long-term anticonvulsant therapy on nerve conduction.
  • Identifies reduced ENCV as a potential biomarker in younger SMON patients.