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. 2013 Aug 28;28(9):1261–1269. doi: 10.3346/jkms.2013.28.9.1261

Fig. 4.

Fig. 4

Monitoring for the recurrent laryngeal nerve injury in thyroid surgery. During thyroidectomy, compound muscle action potential (CMAP) is recorded at the vocal cord muscles, using continuous nerve stimulation technique (A). The CMAP is abruptly lost during surgery and does not recover at the end of surgery (B). This patient experienced post-operative complication of the vocal cord paralysis.