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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(3):642-646.
A Neurophysiologic Study of External Anal Sphincter Muscle Using Magnetic Stimulation.
Yang, Won Ho , Jeong, Young Seon , Park, Byung Gwon
Department of Rehabilitation Medicine, Chosun University College of Medicine.
자기 자극을 이용한 외항문괄약근의 신경생리학적 검사
양원호, 정영선, 박병권
조선대학교 의과대학 재활의학교실
Abstract

Objective
To examine the nerve supply of external anal sphinctor muscle which contributes for the anal or urinary continence.


Method
In the present study, sacral arc reflex was examined by an electrical stimulation of the penile shaft and recording of the compound muscle action potential from the external anal sphincter muscle with surface electrode, and pudendal nerve conduction was done by using a magnetic stimulation of proximal and distal cauda equina and recording from the external anal sphincter muscle.


Results
The results showed that the mean sacral arc reflex latency was 36.88⁑3.59 msec, and mean amplitude was 223⁑51.86 ㄍV with an electrical stimualtion. The mean latency by a magnetic stimulation of the proximal cauda equina was 6.34⁑1.29 msec, and the mean amplitude was 138⁑56 ㄍV. The mean latency by a magnetic stimualtion of the distal cauda equina was 3.67⁑0.44 msec, mean amplitude was 534⁑380 ㄍV.


Conclusion
The pudendal nerve conduction study using a magnetic stimulation is a useful evaluation tool for the fecal incontinence of peripheral type, and neurogenic bladder.

Key Words: External anal sphincter muscle, Pudendal nerve, Electrical stimulation, Magnetic stimulation


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