Table 2.
Electrodiagnostic findings in proband and other family members.
| II-1 | II-3 | I-1 | I-2 | ||||||
| Normal value | Left | Right | Left | Right | Left | Right | Left | Right | |
|
| |||||||||
| Median nerve | |||||||||
| DML (ms) | < 4.4 | 2.8 | 3 | 3.2 | 3 | 3.4 | 3.5 | ||
| CMAP (mV) | >4 | No response | 1.6 | 1.6 | 7.5 | 7.3 | 8.9 | 12.4 | |
| MCV (m/s) | >49 | 52.4 | 50 | 59.5 | 57.9 | 55.6 | 60.6 | ||
| DSL (ms) | <3.5 | 2.8 | 3 | 3.3 | 3.1 | ||||
| SNAP (μV) | >20 | No response | No response | 34 | 32 | 49 | 42 | ||
| SCV (m/s) | >50 | 56.5 | 54.2 | 51.5 | 52 | ||||
|
| |||||||||
| Ulnar nerve | |||||||||
| DML (ms) | <3.3 | 1.75 | 1.75 | 2.5 | 2.5 | Not performed | 2.7 | ||
| CMAP (mV) | >6 | No response | 2.9 | 4.1 | 6.2 | 6.3 | 5.5 | ||
| MCV (m/s) | >49 | 52.8 | 52.8 | 61.5 | 53.4 | 60.6 | |||
| DSL (ms) | <3.1 | 2.7 | 3.6 | 2.5 | |||||
| SNAP (μV) | >17 | No response | No response | 26 | 23 | 42 | |||
| SCV (m/s) | >50 | 51 | 51 | 57.9 | |||||
|
| |||||||||
| Posterior Tibial nerve | |||||||||
| DML (ms) | <5.8 | 4.2 | 4.1 | 3.5 | Not performed | ||||
| CMAP (mV) | >4 | No response | No response | 11.9 | 9.2 | 11.4 | |||
| MCV (m/s) | >41 | 47.4 | 49.3 | 51.5 | |||||
|
| |||||||||
| Deep Peroneal nerve | |||||||||
| DML (ms) | <6.5 | No response | No response | Not performed | 4.1 | Not performed | |||
| CMAP (mV) | >2 | 2.6 | |||||||
| MCV (m/s) | >44 | 49.2 | |||||||
|
| |||||||||
| Superficial peroneal nerve | |||||||||
| DSL (ms) | <4.4 | No response | No response | 4.6 | 5.2 | Not performed | |||
| SNAP (μV) | >6 | 1.2 | 0.8 | ||||||
| SCV (m/s) | >40 | 52.6 | 47.6 | ||||||
|
| |||||||||
| Sural nerve | |||||||||
| DSL (ms) | <4.4 | No response | No response | 2.9 | 2.8 | 3.4 | 3.4 | ||
| SNAP (μV) | >6 | 12 | 15 | 19 | 21 | ||||
| SCV (m/s) | >40 | 57.1 | 52.4 | 46.2 | 46.2 | ||||
|
| |||||||||
| Needle EMG | De- and reinnervation | Not performed | Normal | Not performed | |||||
DML: distal motor latency, CMAP: compound muscle action potential, MCV: motor conduction velocities, DSL: distal sensory latency, SNAP: compound sensory action potential, SCV: sensory conduction velocities, and EMG: electromyography. Nerve conduction studies were not evaluated in II-2 (proband's sister).