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KMID : 0860920090110020105
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2009 Volume.11 No. 2 p.105 ~ p.109
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Prognostic Value of Laryngeal Electromyography in Patient with Vocal Cord Paralysis
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Yoon Kyung-Jae
Ha Jae-Yong
Han Tai-Ryoon
Paik Nam-Jong
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Abstract
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Objective: To assess the prognostic value of laryngeal electromyography in patients with vocal cordparalysis and to determine which element of laryngeal electromyography is important for predictingrecovery of vocal cord paralysis.
Methods: Twenty nine cases of vocal cord paralysis were diagnosed by laryngeal electromyography andlaryngoscopy within 6 months after the onset of symptom. The elements of laryngeal electromyographywere abnormal spontaneous activity, motor unit action potential, and interference pattern. Follow-uplaryngoscopy was performed to evaluate the recovery of vocal cord paralysis by viewing the vocal cordmotion.
Results: Of 29 cases of vocal cord paralysis, 10 cases (34.5%) had resolved vocal cord motion, whereas19 (65.5%) had persistent vocal cord paralysis on follow-up laryngoscopy examination. Prevalence ofabnormal spontaneous activity and abnormal motor unit action potential were not different between thetwo groups, whereas interference pattern was significantly different (p<0.05). Absence or single interferencepattern reflected the permanent vocal cord paralysis.
Conclusion: Laryngeal electromyography was a valuable test to predict recovery from the vocal cordparalysis. Initial interference pattern was an important element to predict vocal cord motion.
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KEYWORD
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Vocal cord paralysis, Prognosis, Electromyography
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