Wrist – Digit I

Surface Recording Technique, Antidromic 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 antidromic method [ 1], ring electrodes were placed over the digit I (thumb) to record median (R1) and radial (R2) sensory nerve action potentials (SNAPs). The active electrode (A) was placed at the base of the digit I, 10 cm from the stimulation points for the median (S1) and radial (S2) nerves at the wrist. The reference (R) was placed on the distal junction between the proximal phalanx and the distal phalanx. Ground (G) electrode position was not specified in the report; the figure shows the ground electrode placed on the palm. Median (R1) and radial (R2) nerve recordings were made separately (Fig. 1).


Median Nerve Radial Nerve Nerve Conduction Study Diabetic Polyneuropathy Sensory Nerve Action Potential 
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  1. 1.
    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
  2. 2.
    Johnson EW, Kukla RD, Wongsam PE et al (1981) Sensory latencies to the ring finger: normal values and relation to carpal tunnel syndrome. Arch Phys Med Rehabil 62:206–208PubMedGoogle Scholar
  3. 3.
    Jackson DA, Clifford JC (1989) Electrodiagnosis of mild carpal tunnel syndrome. Arch Phys Med Rehabil 70:199–204PubMedGoogle Scholar
  4. 4.
    Sheu JJ, Yuan RY, Chiou HY et al (2006) Segmental study of the median nerve versus comparative tests in the diagnosis of mild carpal tunnel syndrome. Clin Neurophysiol 117:1249–1255PubMedCrossRefGoogle Scholar
  5. 5.
    Imada M, Misawa S, Sawai S et al (2007) Median-radial sensory nerve comparative studies in the detection of median neuropathy at the wrist in diabetic patients. Clin Neurophysiol 118:1405–1409PubMedCrossRefGoogle Scholar
  6. 6.
    Gazioglu S, Boz C, Altunayoglu Cakmak A (2011) Electrodiagnosis of carpal tunnel syndrome in patients with diabetic polyneuropathy. Clin Neurophysiol 122:1463–1469PubMedCrossRefGoogle Scholar
  7. 7.
    Pease WS, Cannell CD, Johnson EW (1989) Median to radial latency difference test in mild carpal tunnel syndrome. Muscle Nerve 12:905–909PubMedCrossRefGoogle Scholar
  8. 8.
    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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