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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(5):1056-1059.
How to Deal with the Latency of Unobtainable Responses in the Statistical Analysis.
Pyun, Seong Bom , Kwon, Hee Kyu , Lee, Hang Jae
Department of Rehabilitation Medicine, Korea University College of Medicine.
신경전도검사의 자료분석에서 유발되지 않은 전위의 잠시의 처리
편성범, 권희규, 이항재
고려대학교 의과대학 재활의학교실

To evaluate the usability of near-nerve needle recording techniques in cases of unrecordable sensory nerve action potentials (SNAPs) with a surface electrode and to determine a proper alternative value of the missing latencies.

Twenty six hands of 23 patients with a carpal tunnel syndrome (CTS) and an unobtainable median SNAP by surface electrode were evaluated by the near-nerve needle recording of median SNAPs. Using the nerve conduction data of 113 patients with CTS, we have established 3 alternative values: maximal, 95 percentile and predictive latencies. The alternative values were compared with the mean onset latencies by the near-nerve needle recordings of median SNAPs.

Median SNAPs were obtainable in the 22 out of 26 hands by the near-nerve recording technique. The mean onset latency was 5.51⁑0.36 ms. The alternative values from 113 patients with CTS were as follows: maximum latency, 6.9 ms; 95 percentile latency, 5.6 ms; and predictive latency, 5.52 ms (Y = ⁣0.123* X ⁢ 5.52491; Y, onset latency; X, amplitude; r2=0.564; p=0.00). The Predictive latency was nearest to the mean onset latency.

To minimize the selection bias and statistical errors, the near nerve recording techniques proved to be a valuable method in cases of unrecordable SNAPs with surface electrode. For compensation of missing data, a proper alternative value can be obtained by the predictive latency calculated from a linear regression.

Key Words: Carpal tunnel syndrome, Sensory nerve action potential, Near-nerve needle recording techniques
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