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Related Experiment Videos

Visual evoked potentials during hyperthermia

R F Saul1, G Hayat, J B Selhorst

  • 1Department of Neurology, Geisinger Medical Center, Danville, Pennsylvania, USA.

Journal of Neuro-Ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society
|June 1, 1995
PubMed
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Hyperthermia (HT) impairs optic nerve conduction, causing increased latency and reduced amplitude in pattern visual evoked potentials (PVEPs). This confirms demyelinated nerves

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Clinical Electrophysiology

Background:

  • Demyelinated optic nerves are known to be sensitive to temperature changes.
  • Pattern visual evoked potentials (PVEPs) assess the integrity of the visual pathway.

Purpose of the Study:

  • To investigate the impact of hyperthermia (HT) on central visual conduction pathways.
  • To evaluate alterations in PVEPs in normal and demyelinated optic nerves under HT.

Main Methods:

  • PVEP peak latency and amplitudes were measured in 10 normal subjects and 6 patients with demyelinating optic neuropathy.
  • Measurements were taken before and during induced hyperthermia.

Main Results:

  • In normal subjects, HT decreased P2 latency and P2 amplitude.

Related Experiment Videos

  • In patients with demyelinating optic neuropathy, HT caused decreased P2 latencies (except in some multiple sclerosis patients) and consistent P2 amplitude decline.
  • Amplitude loss correlated with visual acuity changes and suggested conduction block.

    • Conclusions:

    • HT-induced changes in PVEPs correlate with the temperature sensitivity of demyelinated optic nerves.
    • Findings are relevant for monitoring central pathways in clinical settings.
    • Reversible amplitude loss suggests potential for therapeutic interventions targeting conduction block.