Table 3.
Intraoperative EMG signals and mechanism of nerve injury in the RLNs without complete LOS (detectable injury site and R2p/R2d reduction >50%).
| No. | V1 (µV) | R1 (µV) | R2p (µV) | R2d (µV) | V2 (µV) | R2p/R2d reduction | Injury site | Injury mechanism | VC mobility |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 949 | 1017 | 708 | 1431 | 655 | 51% | U(BL) | traction | sym |
| 2 | 2051 | 2215 | 1188 | 2491 | 1037 | 52% | U(BL) | traction | sym |
| 3 | 3598 | 3752 | 1337 | 2806 | 1068 | 52% | U(BL) | traction | sym |
| 4 | 2728 | 2899 | 1393 | 3110 | 979 | 55% | U(BL) | traction | sym |
| 5 | 1261 | 1358 | 512 | 1214 | 358 | 58% | U(BL) | traction | weak |
| 6 | 1570 | 2237 | 989 | 2441 | 606 | 59% | U(BL) | traction | sym |
| 7 | 1957 | 2354 | 954 | 2325 | 801 | 59% | U(BL) | traction | sym |
| 8 | 2235 | 3695 | 1480 | 3855 | 1072 | 62% | U(BL) | traction | weak |
| 9 | 1153 | 1278 | 364 | 1480 | 244 | 66% | U(BL) | traction | sym |
| 10 | 921 | 843 | 396 | 1230 | 272 | 68% | U(BL) | traction | fixedt |
| 11 | 752 | 780 | 229 | 724 | 167 | 68% | L | trauma | fixedt |
| 12 | 2707 | 4570 | 1647 | 5254 | 903 | 69% | U(BL) | traction | sym |
| 13 | 1175 | 1363 | 688 | 2264 | 462 | 70% | U(BL) | traction | weak |
| 14 | 1728 | 3494 | 880 | 3422 | 543 | 74% | U(BL) | traction | weak |
| 15 | 1889 | 2206 | 509 | 2144 | 577 | 76% | L | trauma | weak |
| 16 | 1287 | 1658 | 346 | 1712 | 247 | 80% | M | trauma | fixedt |
| 17 | 1152 | 1289 | 145 | 755 | 138 | 81% | U(BL) | traction | fixedt |
| 18 | 1564 | 1735 | 351 | 1837 | 287 | 81% | L | thermal | fixedt |
| 19 | 1308 | 1521 | 188 | 1810 | 122 | 90% | L | trauma | fixedt |
| 20 | 2896 | 3015 | 250 | 3109 | 235 | 92% | U(BL) | traction | fixedt |
| 21 | 2779 | 3410 | 323 | 3822 | 190 | 92% | U(BL) | traction | fixedt |
| 22 | 2935 | 3773 | 232 | 3351 | 217 | 93% | U(BL) | trauma | fixedt |
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; sym, symmetric; fixed t, temporary palsy.