Table 4.
Intraoperative EMG signals and mechanism of nerve injury in the RLNs with complete LOS.
| No. | V1 (µV) | R1 (µV) | R2p (µV) | R2d (µV) | V2 (µV) | R2p/R2d reduction | Injury site | Injurymechanism | VC mobility |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2862 | 2993 | LOS | 3279 | LOS | =100% | U(BL) | traction | fixedt |
| 2 | 1391 | 1581 | LOS | 1242 | LOS | =100% | U(BL) | traction | fixedt |
| 3 | 2430 | 2882 | LOS | 2976 | LOS | =100% | U(BL) | traction | fixedt |
| 4 | 3616 | 4600 | LOS | 5019 | LOS | =100% | U(BL) | traction | fixedt |
| 5 | 1716 | 2585 | LOS | LOS | LOS | =0% | nil | traction | fixedt |
| 6 | 2145 | 2521 | LOS | LOS | LOS | =0% | nil | traction | fixedt |
| 7 | 1053 | 1384 | LOS | LOS | LOS | =0% | nil | traction | fixedt |
| 8 | 2816 | 2756 | LOS | 3149 | LOS | =100% | U(BL) | trauma | fixedt |
| 9 | 1532 | 3750 | LOS | 3818 | LOS | =100% | L | trauma | fixedt |
| 10 | 729 | 1395 | LOS | 1289 | LOS | =100% | M | trauma | fixedt |
| 11 | 1748 | 1784 | 1998 | LOS | LOS | =100% | M | trauma | fixedt |
| 12 | 2154 | 3823 | LOS | 3750 | LOS | =100% | U(BL) | thermal | fixedt |
| 13 | 1421 | 1600 | LOS | 1744 | LOS | =100% | M | thermal | fixedp |
| 14 | 2860 | 3637 | LOS | 3171 | LOS | =100% | U(BL) | thermal | fixedp |
EMG, electromyography; RLN, recurrent laryngeal nerve; LOS, complete loss of signal; VC, vocal cord; U(BL), upper portion of the exposed RLN (at the region of Berry’s ligament); M, middle portion of the exposed RLN; L, lower portion of the exposed RLN; fixed t, temporary palsy; fixed p, permanent palsy.