What is Vocal Cord EMG?
Vocal cord electromyography (EMG) is the analysis of the electrical energy produced by the vocal cord muscles. In EMG, fine, small, sterile needle electrodes are placed into the vocal cord muscles. These electrodes convert the muscle energy into signals that can be seen and heard through the EMG device. Analysis of this energy provides detailed information about the function of the vocal cord muscles and the nerves that control them.
How is Vocal Cord EMG performed?
Vocal cord EMG is a short procedure performed in the outpatient clinic with local anesthesia while the patient is awake. It is not a painful procedure. Fine, small needle electrodes are sequentially inserted into the muscles through the neck. To evaluate muscle activity, the patient is asked to perform maneuvers during EMG, such as swallowing, straining, or producing the vowel 'i'.
Why is Vocal Cord EMG performed?
- To obtain information about the potential recovery of nerve damage in patients with vocal cord paralysis
- To diagnose vocal cord weakness (especially in cases of vocal fatigue, reduced vocal strength, inability to reach high-pitched tones, which may sometimes only be diagnosed with EMG)
- To administer Botox treatment to the vocal cords
- To determine the surgical side in bilateral vocal cord paralysis
- To diagnose neurological voice disorders (such as voice tremor, myasthenia gravis)