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Journal of the Korean Academy of Rehabilitation Medicine 1994;18(4):18.
Comparison of Median and Ulnar Nerve Action Potentials in the Carpal Tunnel Syndrome
Jung Bin Shin, M.D., Yoon Ghil Park, M.D., Jae Hyung Sa, M.D,, Sung Woo Kim, M.D. , Sae Il Chun, M.D.
Department of Rehabilitation Medicine, Yonsei University College of Medicine

and Literature Chonbuk National University

수근관 증후관 환자에서 정중신경과 척골신경의 신경전도검사 비교
신정빈, 박윤길, 사재형, 김성우, 전세일
연세대학교 의과대학 재활의학교실

In early or mild carpal tunnel syndrome(CTS), conventional electrodiagnostic studies may show normal responses, In 50 hands from 50 control subjects and 16 hands from 10 CTS patients, mean values for latencies and amplitudes of the median and ulnar nerve were obtained, and then difference(median-ulnar) and ratio(median/ulnar) were calculated.

The difference of distal latencies(median-ulnar) and distal latency ratio(median/ulnar) to ulnar in control and patients group were statistically significant. The amplitude ratios of median ot ulnar sensory action potentials in control and patients group were 1.23 and 0.80, respectively, and the difference between two groups were statistically significant.

Using discriminant analysis, it is suggested that the sensitive diagnostic methods of CTS are the ratio of median sensory latencies stimulated at palm and wrist. the latency of median sensory nerve stimulated at wrist, the latency of median motor nerve stimulated at wrist and the difference between the distal motor latencies of median and ulnar nerve, in order of sensitivity.

Key Words: Carpal tunnel syndrome, Median nerve, Ulnar nerve, Ratio. Difference


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