Neurophysiological results
| 1992 | 1995 | ||||||
|---|---|---|---|---|---|---|---|
| Amplitude (μV) | Latency (ms) | Amplitude | |||||
| Sensory study: | |||||||
| Right median1 | 41-150 | 3.1 | Absent | ||||
| Right and left ulnar2 | Absent | Absent | |||||
| Left radial3 | 7 | 2.5 | Absent | ||||
| Motor study: | |||||||
| CMAP (mV) | CV (m/s) | EMG | CMAP | CV | EMG | ||
| Right ulnar4 | 14.5 | 52 | Ax | 3.9 | 52 | CPD | |
| Left ulnar | 9.0 | 53 | — | 1.5 | 49 | CPD | |
| Left median | 8.5 | 49 | — | 10.3 | 51 | NAD | |
| Normal values18: | |||||||
| Amplitude (μV) | Latency (ms) | ||||||
| 1 | >10 | <3.8 | |||||
| 2 | >5 | <3.2 | |||||
| 3 | >15 | <3.3 | |||||
| CMAP (mV) | CV (m/s) | ||||||
| 4 | >5 | >51 | |||||
↵1-150 Low amplitude reflecting previous nerve damage:see text.
SAP=sensory action potential (μV); CMAP=ompound muscle action potential (mV); CV=conduction velocity (m/s); EMG=needle electromyography; Ax=mild active axonal damage; CPD=chronic partial denervation with reinnervation; NAD=No abnormality detected.