J Korean Acad Rehabil Med.  1998 Jun;22(3):642-646.

A Neurophysiologic Study of External Anal Sphincter Muscle Using Magnetic Stimulation

• Yang WH
• Jeong YS
• Park BG

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 V 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 V. The mean latency by a magnetic stimualtion of the distal cauda equina was 3.67+/-0.44 msec, mean amplitude was 534+/-380 V.
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.

Keyword

External anal sphincter muscle; Pudendal nerve; Electrical stimulation; Magnetic stimulation

MeSH Terms

Action Potentials
Anal Canal*
Cauda Equina
Electric Stimulation
Electrodes
Fecal Incontinence
Pudendal Nerve
Reflex
Urinary Bladder, Neurogenic