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Multimodality evoked potentials in amyotrophic lateral sclerosis.

A Ghezzi1, E Mazzalovo, C Locatelli

  • 1Multiple Sclerosis Study Centre, University of Milan, Gallarate Hospital, Italy.

Acta Neurologica Scandinavica
|May 1, 1989
PubMed
Summary
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Amyotrophic lateral sclerosis (ALS) patients showed normal visual and auditory evoked potentials. However, somatosensory evoked potentials revealed delayed nerve signal transmission in some ALS patients, indicating potential peripheral nerve involvement.

Area of Science:

  • Neuroscience
  • Neurology
  • Clinical Electrophysiology

Background:

  • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting motor neurons.
  • Electrophysiological studies are crucial for understanding nerve conduction and diagnosing neurological disorders.

Purpose of the Study:

  • To investigate visual, brainstem auditory, and somatosensory evoked potentials in patients with ALS.
  • To identify potential electrophysiological abnormalities in ALS beyond central nervous system involvement.

Main Methods:

  • Recording of visual evoked potentials (VEP), brainstem auditory evoked potentials (BAEP), and somatosensory evoked potentials (SSEP) in 27 ALS patients.
  • Stimulation via median nerve and analysis of specific latency and amplitude parameters.

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Main Results:

  • VEP and BAEP parameters were within normal limits for all ALS patients.
  • Abnormal delays in somatosensory evoked potentials were observed in 8 patients.
  • Specific delays noted in N9-N13 and N13-N19 latencies of SSEPs.

Conclusions:

  • While central pathways assessed by VEP and BAEP appear unaffected in this ALS cohort, SSEP abnormalities suggest peripheral somatosensory pathway involvement.
  • Electrophysiological testing, particularly SSEPs, can reveal subclinical peripheral nerve dysfunction in ALS patients.