Table 2.
Monitoring data of patients with nerve root injury
| Case | Muscle group involved | Transcranial motor evoked potential amplitudes (%) |
Result of monitoring | Short-latency somatosensory evoked potential (mV) |
Procedure prior to alarm | ||
|---|---|---|---|---|---|---|---|
| Alarm period | Final | Control | Final | ||||
| 1 | R. TA | 15 | 7 | True-positive | - | - | Correction of kyphosis |
| 2 | R. quadriceps | 24 | 29 | True-positive | - | - | Rod rotation |
| 3 | L. TA | 23 | 10 | True-positive | 1.12 | 1.15 | Screw insertion |
| 4 | L. TA | 21 | 11 | True-positive | 0.81 | 0.54 | Rod rotation |
| 5 | R. quadriceps | 6 | 12 | True-positive | 0.31 | 0.43 | Correction of kyphosis |
| 6 | L. quadriceps | 6 | 3 | True-positive | 0.82 | 0.65 | Rod rotation |
| 7 | L. TA | - | 74 | False-negative | 1.68 | 1.07 | Unknown |
R, right; L, left; TA, tibialis anterior.