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Method for Simultaneous fMRI/EEG Data Collection during a Focused Attention Suggestion for Differential Thermal Sensation
Published on: January 5, 2014
Visual evoked potentials during hyperthermia
R F Saul1, G Hayat, J B Selhorst
1Department of Neurology, Geisinger Medical Center, Danville, Pennsylvania, USA.
Summary
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.
- 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.
