Sensitivity was 10 μV/division, low-frequency filter was 20 Hz, high-frequency filter was 2 kHz, sweep speed was 1.5 ms/division, and the machine used was a two-channel Medelec Synergy Oxford Instrument. Duration of pulse and rate of pulse were not specified.
This study was performed in the supine position with the thumb (digit I) in the maximal palmar abduction.
Following the antidromic method [
1] proposed previously by Bergeron and Braddom [
2], the median sensory nerve conduction study was performed recording the action potentials from the palmar cutaneous branch (PCB) over the
thenar eminence (Fig.
1). The active recording (A) electrode was placed on the skin of the midthenar eminence at the halfway point on an imaginary line connecting the ulnar aspect of the first metacarpophalangeal joint and the
palmaris longus(PL) tendon as it crossed the distal wrist crease. The reference (R) electrode was placed distally toward the base of the digit II...
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