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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(3):634-636.
Variations in Motor Nerve Conduction Latency According to Different Recording Electrodes.
Yoon, Joon Shik , Lee, Hang Jae , Kwon, Hee Kyu
Department of Rehabilitation Medicine, Korea University, College of Medicine.
기록 전극 종류에 따른 운동신경 활동전위 잠시의 변화
윤준식, 이항재, 권희규
고려대학교 의과대학 재활의학교실

To explore the effects of different recording electrodes on motor nerve conduction latencies.

Median motor conduction study was performed in 10 healthy subjects. Motor conduction latency was determined by placing different recording electrodes (surface disc, monopolar needle and concentric needle) at the motor point of the left abductor pollicis brevis muscle, and reference electrodes on the proximal interphalangeal joint of the thumb. Motor nerve conduction recording was performed by using a surface disc, monopolar needle, and concentric needle. For the intramuscular recordings, needles were inserted both superficially and deep. The stimulus electrodes were secured 8 cm proximal to the recording electrodes, and the same intensity was applied throughout the tests.

Deep intramuscular monopolar and concentric needle electrodes recorded the shorter latencies, 3.0⁑0.4 ms and 3.0⁑0.3 ms, respectively. Superficial concentric needle electrode recorded the longest latency of 3.4⁑0.3 ms. Motor nerve conduction latencies using a surface disc and superficial monopolar electrode were 3.2⁑0.3 ms and 3.2⁑0.3 ms, respectively.

We conclude that the distal motor nerve conduction latency is variable depending on the type of recording electrodes.

Key Words: Motor response, Electrodes, Latency


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