Study of Laryngeal Evoked Electromyography Method in Rats

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J Korean Soc Laryngol Phoniatr Logop > Volume 11(2); 2000 > Article

Journal of The Korean Society of Laryngology, Phoniatrics and Logopedics 2000;11(2): 178-184.

백서를 이용한 후두 유발 근전도 검사 방법에 대한 연구

조선희¹, 이재연², 민선식³, 신유리², 정성민²

¹이화여자대학교 의과대학 생리학교실²이화여자대학교 의과대학 이비인후과학교실³고려대학교 의과대학 생리학교실 및 신경과학연구소

Study of Laryngeal Evoked Electromyography Method in Rats

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ABSTRACT

Laryngeal evoked EMG is the objective and quantitative method to measure the innervation of laryngeal muscle. If there is a mobility disorder of vocal cords, the cause and location of neural lesion co be understood by the laryngeal evoked EMG and if there is a vocal cord paralysis, the degree of recovery and the policy of treatment can be determined by it. Recently, the studies of reinnervation after recurrent laryngeal nerve injury have been actively carried out. Laryngeal evoked EMC is useful to these studies. The aim of study is to know whether noninvasive methods for stimulating the recurrent laryngeal nerve and for recording of compound action potential(CAP) using surface electrode are as useful as the invasive method using needle electrode. We obtained EMG of laryngeal muscle by various stimulating and recording methods : 1) Direct nerve stimulation by placing nerve cuff electrode made out of silastic tube and platinum wire and recording by insertion of hook wire electrode into posterior cricoarytenoid(PCA) and thyroarytenoid(TA) muscles, respectively. 2) Recording of compound action potential by surface electrode after stimulation of recurrent laryngeal nerve by the insertion of 27 gauge of needle electrode. 3) Recording of compound action potential by surface electrode after stimulating the recurrent laryngeal nerve by transcutaneous blunt rod electrode at tracheoesophageal groove. The amplitude, duration and latency of the CAP evoked by recurrent laryngeal nerve stimulation were compared among the three groups. The amplitude of CAP was smallest in the group recorded from posterior cricoarytenoid and hyroarytenoid muscle, and that recorded by surface electrode after stimulation by needle electrode was largest. The difference in amplitude between the group by hook wire recording and the two groups by surface electrode recording was significant statistically. There is no significant difference in duration and latency among three groups. Since the waveform of CAP from all three methods has similar duration, latency, we concluded that noninvasive method is a useful as invasive methods.

KEY WORDS： Laryngeal evoked EMG;Compoud action potential(CAP);

중심 단어： 후두 유발 근전도;