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Cold evoked potentials: Acquisition from cervical dermatomes.

Jan Rosner1, Janosch Rinert1, Mario Ernst1

  • 1Spinal Cord Injury Center, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland.

Neurophysiologie Clinique = Clinical Neurophysiology
|December 16, 2018
PubMed
Summary
This summary is machine-generated.

Cold evoked potentials (CEPs) are feasible for assessing cold pathways in healthy subjects, showing best reliability in the C4 dermatome and hairy skin. Further research is needed to improve latency reliability for clinical use.

Keywords:
A-delta fiberCold evoked potentialCoolingFeasibilityReliabilitySpinothalamic tract

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Area of Science:

  • Neuroscience
  • Somatosensory System Research
  • Clinical Electrophysiology

Background:

  • Cold evoked potentials (CEPs) offer a novel method for evaluating cold-specific somatosensory pathways.
  • Objective assessment of these pathways is not yet standard clinical practice.
  • CEPs may elucidate altered cold processing in neurological disorders.

Purpose of the Study:

  • To assess the feasibility and test-retest reliability of CEPs in two cervical dermatomes.
  • To include recording sites in both glabrous and hairy skin.
  • To facilitate the clinical application of CEPs.

Main Methods:

  • Twenty healthy subjects received 15 cold stimuli (30°C to 25°C) via thermode.
  • Stimulation sites included the C6 dermatome (hand dorsum, hairy skin), C4 dermatome (shoulder, hairy skin), and C6 dermatome (thenar eminence, glabrous skin).
  • Vertex potentials (N2P2 amplitudes and N2 latencies) were recorded using surface EEG; test-retest statistics were calculated.

Main Results:

  • A 5°C cooling elicited vertex potentials (N2P2) consistent with A-delta fiber activation.
  • Test-retest reliability was highest for the C4 dermatome and hairy skin.
  • Amplitude reliability was fair to substantial (ICCs 0.51-0.81), while latency reliability was poor (ICCs -0.13 to 0.31).

Conclusions:

  • Acquisition of CEPs from cervical dermatomes is feasible.
  • CEPs can complement existing techniques for assessing peripheral and central nervous system disorders.
  • Future studies should explore faster cooling paradigms to enhance signal-to-noise ratio and improve latency reliability.