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Digit II, V – Wrist

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

Original Settings

Sensitivity was 15 μV/division, sweep speed was 2 ms/division, duration of pulse was 0.1–0.4 ms, and the machines used were a Tektronix type 122 preamplifier and a Tektronix type 564 B storage oscilloscope; low frequency filter, high-frequency filter and rate of pulse were not specified.

Position

This study was performed in the supine position.

Recording

Following the orthodromic method [ 1], signals were recorded using surface electrodes (10-mm disks or standard rings) from the median and ulnar nerves separately (Fig. 1). For the median nerve (R1) and ulnar nerve (R2), the active recording electrodes (A) were placed proximal to the distal crease at the wrist, on the median and ulnar trunks, respectively. No fixed distances were mentioned in the text. The cathodes were placed proximally. Great care was taken to prevent the spread of stimulus to the adjacent digits by covering them with a nonconducting adhesive plaster, as it was found that a spread of stimulus through...

References

  1. 1.
    Loong SC, Seah CS (1971) Comparison of median and ulnar sensory nerve action potentials in the diagnosis of the carpal tunnel syndrome. J Neurol Neurosurg Psychiatry 34:750–754PubMedCentralPubMedCrossRefGoogle Scholar
  2. 2.
    Redmond MD, Rivner MH (1988) False positive electrodiagnostic tests in carpal tunnel syndrome. Muscle Nerve 11:511–517PubMedCrossRefGoogle Scholar
  3. 3.
    Foresti C, Quadri S, Rasella M et al (1996) Carpal tunnel syndrome: which electrodiagnostic path should we follow? A prospective study of 100 consecutive patients. Electromyogr Clin Neurophysiol 36:377–384PubMedGoogle Scholar
  4. 4.
    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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