Thenar – Forearm, Digit I – Wrist

Surface 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 the machine used were not specified.


This study was performed in the supine position.


Following the orthodromic method [ 1], the median sensory nerve conduction studies were performed with comparison of the palmar cutaneous branch (PCB) and digit I nerves (Fig. 1). Recording electrodes (1 cm) mounted on a plastic bipolar bar, with an interelectrode distance of 3 cm, were placed longitudinally at identical distances (10 cm) over the median nerve at the wrist and at the distal forearm, with the orientation of the two recording electrodes along the line of the nerve. For the digit I sensory response (R1), recording electrodes were placed 10 cm at the wrist (proximally to the distal wrist crease). For the PCB response (R2), recording electrodes were placed 10 cm on the distal forearm. For both sensory recordings, the active electrode (A) was...


  1. 1.
    Chang CW, Lien IN (1991) Comparison of sensory nerve conduction in the palmar cutaneous branch and first digital branch of the median nerve: a new diagnostic method for carpal tunnel syndrome. Muscle Nerve 14:1173–1176PubMedCrossRefGoogle Scholar
  2. 2.
    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
  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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