Digit IV – Wrist
Subdermal Recording Technique, Orthodromic Study
Sensitivity, low-frequency filter, high-frequency filter, sweep speed, duration of pulse, rate of pulse, and machine used were not specified.
This study was performed in the supine position.
Following an orthodromic method [ 1] similar to that used by Buchthal et al. in 1974 [ 2], needle recording electrodes were placed at the wrist (R1, R2) for both the median and ulnar nerve recordings. An active recording needle (A) electrode was placed over the median nerve (R1) and over the ulnar nerve (R2) at the wrist. The reference needle (R) electrodes were placed at the wrist, at the same level as the recording electrodes (3–4 cm distance), radial–dorsal for the median nerve recording, and ulnar–dorsal for the ulnar nerve recording (Fig. 1). For the median nerve recordings, the authors placed the reference electrode radial to the active median electrode to reduce significantly the contamination from the ulnar nerve. They adjusted the recording electrodes...
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