Setting: Department of Otolaryngology–Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago.
Synopsis: With vagal stimulation, mean ipsilateral vocalis baseline electromyographic (EMG) amplitude was 924.44 ± 27.70 μV with ETT and 806.19 ± 131.43 μV with ALEs. Amplitudes were similar for right versus left vagus nerves, but mean latency for the left vagus was significantly longer than for the right for both ETT and ALEs. Contralateral vocalis mean amplitude and mean latency recorded by ETT during ipsilateral vagal stimulation were 156.81 ± 15.81 μV and 4.90 ms, respectively. With RLN stimulation, mean baseline EMG amplitude was 1341.88 ± 49.69 μV for ETT and 1117.64 ± 24.31 μV for ALEs. For both electrodes, mean EMG amplitudes and latencies were comparable for the right and left RLN, and mean amplitudes with RLN stimulation were significantly larger and latencies significantly shorter compared to vagal stimulation. The ALE EMG waveform with RLN stimulation showed robust biphasic morphology with the same polarity of deflection compared to the ETT ipsilateral vocalis waveform; both waveforms were better defined and more robust compared to the nontarget contralateral vocalis muscle. Upon external branch of the superior laryngeal nerve (EBSLN) stimulation, mean baseline EMG amplitude for right and left EBSLN combined was 286.89 ± 11.15 μV with ETT and 2315.63 ± 131.29 μV with ALEs. | ← Previous | | | Next → | Single Page