The Median Nerve pp 19-25 | Cite as
Digit II, III – Wrist, Elbow; Digit II, III – Wrist
Surface Recording Technique, Orthodromic Study
Chapter
First Online:
Original Settings
Sensitivity was 10–20 μV/division, and the machine used was a TECA model B. Sweep speed, low frequency filter, high-frequency filter, duration of pulse, and rate of pulse were not specified.
Position
This study was performed in the supine position, with the elbow and fingers slightly flexed.
Recording
Following the orthodromic method (Figs.
1 and
2), signals were recorded at the wrist (R1) and at the elbow (R2). At the wrist (R1), electrodes were placed between the tendons of the
flexor carpi radialis (FCR) and the
palmaris longus (PL) muscles (ideally proximal to the distal wrist crease). The active electrode (A) was placed proximally to the distal crease at the wrist, 14 cm proximal to the stimulating cathode. The reference (R) was placed 2 cm proximally to the active electrode [
1]. At the elbow (R2), electrodes were placed on the antecubital fossa, just medial to the maximal pulsation of the brachial artery, with a 2–4-cm separation between the proximal cathode...
References
- 1.Melvin JL, Harris DH, Johnson EW (1966) Sensory and motor conduction velocities in the ulnar and median nerves. Arch Phys Med Rehabil 47:511–519PubMedGoogle Scholar
- 2.Kemble F (1968) Electrodiagnosis of the carpal tunnel syndrome. J Neurol Neurosurg Psychiatry 31:23–27PubMedCentralPubMedCrossRefGoogle Scholar
- 3.Bland JDP (2000) A neurophysiological grading scale for carpal tunnel syndrome. Muscle Nerve 23:1280–1283PubMedCrossRefGoogle Scholar
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