The Median Nerve pp 289-293 | Cite as
Digit I, II, III, IV, V – Wrist
Surface Recording Technique, Orthodromic Study
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Original Settings
Sensitivity was 10 μV/division, low-frequency filter was 20 Hz, high-frequency filter was 2 kHz, sweep speed was 2 ms/division, duration of pulse was 0.2 ms, and the machine used was a Dantec Cantata. Rate of pulse was not specified.
Position
This study was performed in the supine position. The forearm, wrist, and hand were stabilized with Velcro on a comfortable board.
Recording
Following the orthodromic method [
1], the sensory ultra-distal testing (SUDT) of all digits (digit I–V) of both hands was performed recording with a bipolar fixed distance (2.2 cm) surface electrode placed at the wrist over the median nerve for digit I, digit II, digit III, and digit IV (R1) stimulations and at the wrist over the ulnar nerve for digit V (R2) stimulation (Fig.
1). The active electrode (A) was placed proximal to the stimulating cathode (−), ideally proximal to the distal wrist crease; the reference (R) was placed distally. Each recording was made separately. The ground (G)...
References
- 1.Seror P (1996) The axonal carpal tunnel. Electroencephalogr Clin Neurophysiol 101:197–200PubMedCrossRefGoogle Scholar
- 2.Bland JDP (2000) A neurophysiological grading scale for carpal tunnel syndrome. Muscle Nerve 23:1280–1283PubMedCrossRefGoogle Scholar
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