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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(4):861-865.
Reappraisal of Nerve Conduction Studies in Carpal Tunnel Syndrome.
Cho, Yun Sang , Lee, Seung Hwa , Kwon, Hee Kyu , Lee, Hang Jae
Department of Rehabilitation Medicine, Korea University College of Medicine.
수근관 증후군 진단에 있어서 신경전도 검사의 재평가
조윤상, 이승화, 권희규, 이항재
고려대학교 의과대학 재활의학과교실
Abstract

Objective
The aim of present study is to obtain the reference values of motor and sensory nerve conduction study (NCS) of the median nerve and to re-assess the values of criteria for abnormal findings in the electrophysiological diagnosis of Carpal tunnel syndrome (CTS).


Method
Median and ulnar NCS were performed in 62 neurologically healthy adults as controls and 142 patients with CTS. Reference values of the median and ulnar NCS were obtained from the controls and the criteria for the diagnosis of CTS were made. Sensitivities of diagnostic criteria were calculated.


Results
The criteria included 7 items: (1) A 5-cm short segment study through carpal tunnel, ≥1.3 msec; (2) median motor latency (8 cm), ≥4.0 msec; (3) median sensory latency (14 cm, onset), ≥3.0 msec; (4) median sensory nerve action potential amplitude (baseline to peak), ≤20 uV; (5) ratio of median to ulnar motor latency, ≥1.5; (6) ratio of median to ulnar sensory latency, ≥1.2; (7) ratio of median to ulnar sensory amplitude, ≤0.6. The order of the highest to lowest sensitivity were as follows: a 5-cm short segment study, median sensory latency, median motor latency, ratio of median to ulnar sensory latency, and ratio of median to ulnar motor latency. Approximately 65% of the patients met all the 7 diagnostic criteria and 95% of the patients met 3 or more.


Conclusion
The criteria proposed in this study would enhance the diagnostic sensitivity for the CTS.

Key Words: Carpal tunnel syndrome, Nerve conduction study, Reference value, Sensitivity


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