NCS
| NERVE | SITE | AMP DROP | CV DROP |
|---|---|---|---|
| Ulnar Motor | Across Elbow | -- | 15 m/s or 23% |
| Fibular Motor | Ankle to below fibular head | 32% | -- |
| Fibular Motor | Across fibular head | 25% | 6 m/s or 12% |
| Tibial Motor | Ankle to knee | 10.3 mV or 71% | -- |
| Canterbury Scale CTS | ||
|---|---|---|
| Grade 0 | Normal | Normal findings in all tests |
| Grade 1 | Very Mild | Only detected in 2 sensitive tests |
| Grade 2 | Mild | SNCV F2 < 40m/s, DML <4.5msec |
| Grade 3 | Moderate | Preserved SNAP, 4.5< DML <6.5ms |
| Grade 4 | Severe | Absent SNAP, 4.5< DML <6.5msec |
| Grade 5 | Very Severe | Absent SNAP, DML>6.5msec |
| Grade 6 | Extremely Severe | Absent SNAP, CMAP<0.2mV (peak to peak) |
| EMG Result across elbow | Padua Grade |
|---|---|
| No motor slowing (CV > 50m/s AND AE > BE) | Negative |
| Motor slowing CV < 10ms | Minimal |
|
Motor slowing CV > 10m/s OR Absolute CV < 50m/s |
Mild |
|
As Mild AND Sensory AP < 6uV |
Moderate |
| As Mild AND Absent Sensory AP | Severe |