With the monitoring of CT EMGs as well as objective measurement of displacement of vocal fold across the test conditions, we demonstrated the validity of electrical pacing of paralyzed vocal fold with feedback from ipsilateral CT muscle in unilateral vocal cord paralysis.
The on-off movement of bilateral vocal folds was synchronized in the intact condition (Figure 5(a)), and such synchronization was disrupted by left RLN injury (Figure 5(b)), that is, no movement of left side vocal fold, indicating effective unilateral vocal cord paralysis. Importantly, when using the feedback signals of EMG envelopes from left (injured side) CT muscle, the movement of left (injured) vocal fold was restored and synchronized with the healthyside (Figure 5(c)).
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Documentation of upper airway obstruction in unilateral vocal cord paralysis: Flow-volume loop studies in 43 subjects.
Injection and removal of Teflon for unilateral vocal cord paralysis. Ann Otol Rhinol Laryngol 1992;101:81-6.
Long-term morbidity and mortality in patients undergoing surgery for unilateral vocal cord paralysis. Laryngoscope 1992;102:501-8.