Digit IV – Wrist

Subdermal Recording Technique, Orthodromic Study
  • Giuliano Gentili
  • Mario Di Napoli

Original Settings

Sensitivity, low-frequency filter, high-frequency filter, sweep speed, duration of pulse, rate of pulse, and machine used were not specified.


This study was performed in the supine position.


Following an orthodromic method [ 1] similar to that used by Buchthal et al. in 1974 [ 2], needle recording electrodes were placed at the wrist (R1, R2) for both the median and ulnar nerve recordings. An active recording needle (A) electrode was placed over the median nerve (R1) and over the ulnar nerve (R2) at the wrist. The reference needle (R) electrodes were placed at the wrist, at the same level as the recording electrodes (3–4 cm distance), radial–dorsal for the median nerve recording, and ulnar–dorsal for the ulnar nerve recording (Fig. 1). For the median nerve recordings, the authors placed the reference electrode radial to the active median electrode to reduce significantly the contamination from the ulnar nerve. They adjusted the recording electrodes...


  1. 1.
    Lauritzen M, Liguori R, Trojaborg W (1991) Orthodromic sensory conduction along the ring finger in normal subjects and in patients with a carpal tunnel syndrome. Electroencephalogr Clin Neurophysiol 81:18–23PubMedCrossRefGoogle Scholar
  2. 2.
    Buchthal F, Rosenfalck A, Trojaborg W (1974) Electrophysiological findings in entrapment of the median nerve at wrist and elbow. J Neurol Neurosurg Psychiatry 37:340–360PubMedCentralPubMedCrossRefGoogle Scholar
  3. 3.
    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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