Wrist, Palm – Digit III

Surface Recording Technique, Antidromic Study
  • Giuliano Gentili
  • Mario Di Napoli

Original Settings

Sensitivity was 20 μV/division, sweep speed was 1 ms/division, duration of pulse was 0.05 ms, and the machine used was a TECA TE-4. Low-frequency filter, high-frequency filter, and rate of pulse were not specified.


This study was performed in the supine position.


Following the antidromic method [ 1], signals were recorded using ring electrodes at digit III (Fig. 1). The active recording electrode (A) was placed at the base of digit III (middle finger), 14 cm from the stimulating cathode (−) at the wrist (S1) and 7 cm from the midpalm level (S2) along a line pointing to the midline of the distal wrist crease. The reference electrode (R) was positioned 4 cm distally on the second interphalangeal joint of digit III. Ground (G) electrode was placed on the dorsum of the hand (the figure shows the ground electrode placed on the palm).


Negative Peak Amplitude Stimulation Point Skin Surface Temperature Median Nerve Active Electrode 
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  1. 1.
    Wongsam PE, Johnson EW, Weinerman JD (1983) Carpal tunnel syndrome: use of palmar stimulation of sensory fibers. Arch Phys Med Rehabil 64:16–19PubMedGoogle Scholar
  2. 2.
    Johnson EW, Sipski M, Lammertse T (1987) Median and radial sensory latencies to digit I: normal values and usefulness in carpal tunnel syndrome. Arch Phys Med Rehabil 68:140–141PubMedGoogle Scholar
  3. 3.
    Buschbacher RM (1999) Median 14 cm and 7 cm antidromic sensory studies to digits two and three. Am J Phys Med Rehabil 78:S53–S62Google 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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