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Digit I – Wrist

Surface Recording Technique, Orthodromic Study
  • Giuliano Gentili
  • Mario Di Napoli
Chapter

Original Settings

Sensitivity was 10–20 μV/division, low-frequency filter was 32 Hz, high-frequency filter was 3.2 kHz, sweep speed was 1 ms/division, and duration of pulse was 0.2 ms. Rate of pulse and the machine used were not specified.

Position

This study was performed in the supine position.

Recording

Following the orthodromic method [ 1], surface electrodes of felt (8 mm pads, 25 mm apart) soaked in 0.9 % saline were placed at the wrist for both the median and radial nerve sensory recordings. For the median nerve recording (R1), the electrodes were placed on the course of the median nerve, the active (A) electrode was placed proximal to the distal wrist crease, and the reference (R) was placed proximally. For the radial nerve recording (R2), the electrodes were placed on the course of the radial nerve, the active (A) electrode was placed proximal to the radial styloid, and the reference (R), like for the median nerve, was placed proximally. Recording electrodes from the median...

References

  1. 1.
    Carroll GJ (1987) Comparison of median and radial sensory latencies in electrophysiological diagnosis of carpal tunnel syndrome. Electroencephalogr Clin Neurophysiol 68:101–106PubMedCrossRefGoogle Scholar
  2. 2.
    Bland JDP (2000) A neurophysiological grading scale for carpal tunnel syndrome. Muscle Nerve 23:1280–1283PubMedCrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Giuliano Gentili
    • 1
  • Mario Di Napoli
    • 1
  1. 1.Neurological ServiceS. Camillo de’ Lellis General HospitalRietiItaly

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