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KMID : 0350519940470031295
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Journal of Catholic Medical College
1994 Volume.47 No. 3 p.1295 ~ p.1300
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Nerve Conduction Studies in Human Superior Laryngeal and Recurrent Laryngeal Nerves
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Abstract
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Electrophysiologic investigation in the larynx consist of two parts; needle electromyography and nerve conduction study. In immobile vocal fold or folds, these investigations are essential in the differentiation between neuromuscular lesion and
cricoarytenoid joint fixation. Moreover, in immobility due to neuromuscular pathology, these investigations are the only objective tools in the diagnosis of the site of nerve lesion ; superior laryngeal nerve system or recurrent laryngeal nerve
system,
in the estimation of the degree of injuries, in the prediction of the prognosis, and helpful in determination of the timing and choice of surgical intervention. However, there have been few studies, on normal electrophysiologic reference values
of
superior laryngeal and recurrent laryngeal nerves, and no studies in Korea.
And so to obtain normal data on distal latency and amplitude of superior laryngeal and recurrent laryngeal nerves, we performed nerve conduction studies in 20 normal adults wit freely mobile vocal folds.
@ES The results were as follows:
@EN 1) In 35 superior laryngeal nerves, the distal latency and amplitude of the compound muscle action potential averaged 1.67±025 msec, 10.56±4.27mV.
2) In 26 recurrent laryngeal nerves, the distal latency and amplitude of the compound muscle action potential averaged 1.81±0.33msec, 7.14±2.93mV. There was no significant statistical difference between the distal latency of the right side and
that of
left one.
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KEYWORD
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