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Updated: Aug 21, 2026

An Implantable System For Chronic In Vivo Electromyography
Published on: April 21, 2020
[The prognostic role of electromyography in vocal cord paralysis]
Shicai Chen1, Hongliang Zheng, Shuimiao Zhou
1Department of Otolaryngology, Changhai Hospital, Second Military Medical University, Shanghai 200433.
Objective:
To predict the recovery of vocal cord paralysis (VCP) by using electromyography (EMG).
Method:
The characteristics of EMG of 46 patients with unilateral VCP were assessed to determine the most useful factors in determining prognosis. The factors include the duration, amplitude, waveform morphology, root-mean-square, and time interval.
Result:
A positive prognosis for laryngeal recovery was indicated when the following EMG features were present in the immobile vocal fold during voluntary tasks if EMG was performed during 6 months of the onset of VCP: normal motor unit waveform morphology; no electrical silence. This predictive rate is 76%. When the root-mean-square value is greater than 26 microV, the predictive rate is 80%. On the basis of the criteria, all the prognostic rate is 84%.
Conclusion:
The results support the concept that EMG record is valuable in determining prognosis performed during 6 months of the onset of VCP.
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