Table 2.
Sensitivity and specificity in terms of the number of channels and false negative cases in 4 channel
| Motor deficit + | Motor deficit − | ||||||
|---|---|---|---|---|---|---|---|
| 4-channel | |||||||
| Waveform change + | 8 | 48 | PPV 14 % | ||||
| Waveform change − | 3 | 602 | NPV 99 % | ||||
| Sensitivity 73 % | Specificity 93 % | False positive 7.3 % | |||||
| False negative 0.5 % | |||||||
| 8-channel | |||||||
| Waveform change + | 2 | 1 | PPV 66 % | ||||
| Waveform change − | 0 | 35 | NPV 100 % | ||||
| Sensitivity 100 % | Specificity 97 % | False positive 2.6 % | |||||
| False negative 0 % | |||||||
| 16-channel | |||||||
| Waveform change + | 4 | 7 | PPV 36 % | ||||
| Waveform change − | 0 | 134 | NPV 100 % | ||||
| Sensitivity 100 % | Specificity 95 % | False positive 4.8 % | |||||
| False negative 0 % | |||||||
| Patient | Pathology | Surgery | Recording muscle | Neurological deterioration | Cover rate (%) | Wave change | Duration |
|---|---|---|---|---|---|---|---|
| f, 12-year old | Scoliosis (T5–L3) | Correction and fusion | Bil APB, AH | Bil Quad, Ham, TA | 0 | No | 2 weeks |
| m, 11-year old | Kyphosis (T3–T6) | VCR and fusion | Bil APB, AH | Bil TA | 0 | No | 2 weeks |
| m, 49-year old | CSM | Laminoplasty | Bil Delt, ADM | Rt Delt, biceps | 50 | No | 3 months |