Digit III; Digit III – Wrist

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

Original Settings

Sensitivity was 10 μV/division, sweep speed was 1 ms/division, and the machine used was a Medelec MS3R electromyograph. Low-frequency filter, high-frequency filter, duration of pulse, and rate of pulse were not specified.


This study was performed in the supine position.


Following the orthodromic method [1], sensory nerve action potentials (SNAPs) were recorded to digit III and at the wrist (Figs. 1 and 2). For digit III recordings (digital nerve sensory action potentials), a couple of tinned copper fuse wires were applied to the proximal phalanx of digit III, with the active (A) recording electrode placed near the base of digit III. For the wrist recordings (wrist nerve sensory action potentials), two tinned copper fuse wire electrodes were placed on the median nerve at the wrist, with the active (A) recording electrode placed proximal to the wrist crease. The distal recording and the proximal stimulating electrodes were placed at least 3.5 cm...


Digital Public Health Neurology 
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  1. 1.
    Casey EB, Le Quesne PM (1972) Digital nerve action potentials in healthy subjects, and in carpal tunnel and diabetic patients. J Neurol Neurosurg Psychiatry 35:612–623PubMedCentralPubMedCrossRefGoogle 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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