Digit I – Wrist, Digit II – Wrist, Digit III – Wrist, Digit IV – Wrist

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

Original Settings

Low-frequency filter was 20 Hz, high-frequency filter was 2 kHz, duration of pulse was 0.2 ms, rate of pulse was 1/s, and the machine used was a Dantec Neuromatic 2,000 M electromyograph. Sensitivity and sweep speed were not specified.


This study was performed in the supine position, with the hand in its anatomical position.


Following the orthodromic method [ 1], sensory responses were recorded at the wrist (R) after the median nerve distal stimulation of the digital branches of digit I (Figs. 1 and 2), digit II (Figs. 3 and 4), digit III (Figs. 5 and 6), and digit IV (Fig. 7). Bipolar surface recording electrodes (silver/silver chloride electrodes covered by saline-soaked pads mounted in Perspex and fixed with a silicon rubber strap using minimal tension) were placed with a 2 cm interelectrode distance at the wrist, just proximal to the distal wrist crease (ideally between the tendons of the flexor carpi radialis (FCR) and the palmaris longus(PL)...


Median Nerve Ring Electrode Proximal Interphalangeal Joint Digital Nerve Ulnar Side 
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  1. 1.
    Macdonell RAL, Schwartz MS, Swash M (1990) Carpal tunnel syndrome: which finger should be tested? An analysis of sensory conduction in digital branches of the median nerve. Muscle Nerve 13:601–606PubMedCrossRefGoogle Scholar
  2. 2.
    Sunderland S (1976) The nerve lesion in carpal tunnel syndrome. J Neurol Neurosurg Psychiatry 39:615–626PubMedCentralPubMedCrossRefGoogle Scholar
  3. 3.
    Terzis S, Paschalis C, Metallinos IC et al (1998) Early diagnosis of carpal tunnel syndrome: comparison of sensory conduction studies of four fingers. Muscle Nerve 21:1543–1545PubMedCrossRefGoogle Scholar
  4. 4.
    Spaans F (2001) Neurographic assessment of lesions of single proper digital nerves. Clin Neurophysiol 112:2113–2117PubMedCrossRefGoogle Scholar
  5. 5.
    Aydin G, Keles I, Ozbudak Demir S et al (2004) Sensitivity of median sensory nerve conduction tests in digital branches for the diagnosis of carpal tunnel syndrome. Am J Phys Med Rehabil 83:17–21PubMedCrossRefGoogle Scholar
  6. 6.
    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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