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Related Experiment Videos

Optimal distance for segmental nerve conduction studies revisited.

Mark E Landau1, Myrna I Diaz, Kristen C Barner

  • 1Department of Neurology, Walter Reed Army Medical Center, 6900 Georgia Ave., Washington, DC 20307, USA. Mark.Landau@NA.AMEDD.ARMY.MIL

Muscle & Nerve
|March 14, 2003
PubMed
Summary

This study reevaluates the minimum distance for accurate nerve conduction velocity (NCV) calculations. Current technology allows for reliable NCV measurements at shorter distances than previously recommended.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Previous research by Maynard and Stolov (1972) indicated a minimum 10 cm distance for nerve conduction velocity (NCV) calculations due to significant experimental error at shorter distances.
  • The error in NCV was attributed primarily to latency and distance measurement inaccuracies.

Purpose of the Study:

  • To reestablish the minimum distance required for accurate NCV calculations using contemporary electrodiagnostic technology.
  • To assess the impact of modern equipment on the experimental error associated with NCV measurements.

Main Methods:

  • Twenty physicians measured proximal and distal latencies of ulnar compound muscle action potentials and forearm skin distances.
  • Errors in conduction time and distance were quantified.
  • A spreadsheet model was used to calculate NCV error across various distances and velocities.

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Main Results:

  • The average conduction time was 3.23 ms (SD 0.09 ms), and mean distance was 212.6 mm (SD 2.1 mm).
  • Experimental errors in NCV were lower than previously reported.
  • Error increased with decreased distance, reaching 20% at distances under 6 cm.
  • Latency error constituted 71% of total experimental error, a decrease from 90% in prior studies.

Conclusions:

  • Advances in electrodiagnostic equipment have reduced experimental error in NCV calculations.
  • NCV can be reliably calculated at distances shorter than 10 cm, potentially as low as 5-6 cm.