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Related Experiment Videos

Visually evoked potentials in respiratory chain disorders.

J Finsterer1

  • 1Ludwig Boltzmann Institute for Research in Epilepsy and Neuromuscular Disorders, Vienna, Austria.

Acta Neurologica Scandinavica
|July 10, 2001
PubMed
Summary

Visually evoked potentials (VEPs) are frequently abnormal in respiratory chain disorders (RCDs), often showing prolonged P100 latencies even with normal vision. This highlights VEPs

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Genetics

Background:

  • Respiratory chain disorders (RCDs) are a group of inherited metabolic diseases affecting cellular energy production.
  • The visual system, with its high energy demands, can be particularly vulnerable to mitochondrial dysfunction in RCDs.
  • Visually evoked potentials (VEPs) are electrophysiological tests that measure the visual pathway's integrity.

Purpose of the Study:

  • To determine the frequency of abnormal VEPs in patients diagnosed with RCDs.
  • To assess the occurrence of abnormal VEPs in RCD patients with normal visual acuity.
  • To identify which specific VEP parameters are most commonly affected in RCDs.

Main Methods:

  • A cohort of 26 patients with confirmed RCDs, aged 32-74 years, underwent evaluation.
  • Reversal checkerboard VEPs were utilized to assess visual pathway function.
  • Analysis focused on VEP parameters including P100 latency and P100/N145 amplitude.

Main Results:

  • VEPs were found to be abnormal in 17 out of 26 patients (65%).
  • Prolonged P100 latency was the most common abnormality, observed in 16 patients.
  • Abnormal VEPs were detected in 9 patients (53%) despite having normal visual acuity.
  • A decreased P100/N145 amplitude was noted in only one patient.

Conclusions:

  • VEPs are a valuable tool for detecting both clinical and subclinical visual pathway impairments in RCD patients.
  • Prolonged P100 latencies are the predominant VEP abnormality in RCDs, while amplitudes are often preserved.
  • VEP testing can identify visual dysfunction in RCD patients even when visual acuity appears normal.

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