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Multi-Modal Signals for Analyzing Pain Responses to Thermal and Electrical Stimuli
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Stimulus duration and pain in nerve conduction studies.

Akiko Tamura1, Masahiro Sonoo, Satoshi Hoshino

  • 1Department of Neurology, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan.

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A 0.2-millisecond stimulus duration is found to be least painful for tibial and median nerve conduction studies. This finding suggests optimal stimulus durations for patient comfort during nerve conduction studies.

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Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • Patient comfort during nerve conduction studies (NCS) is often linked to stimulus duration.
  • Shorter stimulus durations are commonly believed to be less painful.

Purpose of the Study:

  • To investigate if shorter stimulus durations are less painful in motor NCS when achieving supramaximal stimulation.
  • To determine the optimal stimulus duration for minimizing pain in motor NCS.

Main Methods:

  • Stimulation of the tibial nerve at the ankle and median nerve at the wrist in human subjects.
  • Comparison of pain perception between different stimulus durations (0.05 ms, 0.2 ms, 1 ms) using a blinded approach.

Main Results:

  • For tibial nerve stimulation, a 0.2 ms duration was significantly less painful than longer or shorter durations.
  • For median nerve stimulation, 0.05 ms and 0.2 ms durations were equally less painful compared to a 1 ms duration.

Conclusions:

  • A 0.2 ms stimulus duration appears appropriate for motor NCS, balancing efficacy and patient comfort.
  • Tibial nerve stimulation was perceived as more painful than median nerve stimulation, irrespective of duration.