Abstract
A common consensus on where on the palm to set the stimulation point location was lacking in median sensory nerve conduction studies. We determined the location for palmar stimulation and performed antidromic sensory nerve conduction studies. For our studies, the recording electrode was set on the palm side of the middle finger near the proximal interphalangeal joint. Stimulation was delivered at the palm, at the wrist and at the elbow. The mean value of onset latency during stimulation at the palm was 1.14 msec, 2.39 msec at the wrist and 5.98 msec at the elbow. The mean value of peak latency during stimulation at the palm was 1.66 msec, 3.00 msec at the wrist and 6.82 msec at the elbow. The mean value of amplitude during stimulation at the palm was 75.3 μV, 54.3 μV at the wrist, and 27.9 μV at the elbow. The mean value of sensory nerve conduction velocity during stimulation at the palm was 61.9 m/sec, 58.6 m/sec at the wrist, and 62.7 m/sec at the elbow. These results suggest that there is minute nerve fiber damage in the vicinity of the carpal tunnels in healthy persons.
