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Contact heat evoked potentials: Reliable acquisition from lower extremities
J Rosner1, M Hubli1, P Hostettler1
1Spinal Cord Injury Center, Balgrist University Hospital, University of Zurich, Zurich, Switzerland.
Summary
Increasing baseline temperature improves contact heat evoked potentials (CHEPs) acquisition in lower extremities. This method enhances the reliability of CHEPs for assessing small fiber integrity.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- Contact Heat Evoked Potentials (CHEPs) are used to assess small fiber neuropathy.
- Reliability of CHEPs in lower extremities requires further investigation.
Purpose of the Study:
- To evaluate the test-retest reliability of CHEPs in the lower extremities.
- To compare two stimulation protocols: normal and increased baseline temperature.
Main Methods:
- 32 healthy subjects participated, with 22 retested.
- CHEPs were recorded from L2, L5, and S2 dermatomes.
- Test-retest reliability was analyzed using different stimulation protocols.
Main Results:
- Increased baseline temperature improved CHEPs acquisition, especially at distal sites (L5, S2).
- CHEP latency (N2 potential) showed the highest reliability.
- CHEP amplitudes demonstrated fair to excellent reliability.
Conclusions:
- Increasing thermode baseline temperature enhances CHEPs acquisition from lower extremities.
- CHEPs are a reliable diagnostic tool for evaluating small fiber integrity.
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