Wrist – Digit II, Wrist – Dorsal Hand

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

Original Settings

The machine used was a Medelec MS92a electromyograph. Sensitivity, low-frequency filter, high-frequency filter, sweep speed, duration of pulse, and rate of pulse were not specified.


This study was performed in the supine position.


Following the antidromic method [ 1], the surface electrodes were placed over digit II (index finger) and over digit I (thumb) to record the median (R1) and superficial radial (R2) sensory nerve action potentials (SNAPs), respectively (Fig. 1). For the median nerve recording (R1), the electrodes were placed at 14 cm distance from the stimulating electrodes at the wrist. Exact active (A) and reference (R) electrode positions were not specified in the text. For the superficial radial nerve recording (R2), the electrodes were placed over the skin of the dorsal hand between the first and second metacarpal areas at a 10 cm distance from the stimulating electrodes at the wrist. The ground (G) electrode position was not specified...


  1. 1.
    Ghavanini MRA, Kazemi B, Jazayeri M et al (1996) Median-radial sensory latencies as new test in carpal tunnel syndrome. Electromyogr Clin Neurophysiol 36:171–173PubMedGoogle Scholar
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    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
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    Carroll GJ (1987) Comparison of median and radial sensory latencies in electrophysiological diagnosis of carpal tunnel syndrome. Electroencephalogr Clin Neurophysiol 68:101–106PubMedCrossRefGoogle Scholar
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    Cassvan A, Ralescu S, Shapiro E et al (1988) Median and radial sensory latencies to digit I as compared with other screening tests in carpal tunnel syndrome. Am J Phys Med Rehabil 67:221–224PubMedCrossRefGoogle Scholar
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    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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