Results of electrophysiological examination in cases 1-6
| Case | Nerve conduction studies | Electromyography | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sensory | Motor | |||||||||
| Median (digit II-wrist) | Sural (lat mall-calf) | Peroneal (EDB) | ||||||||
| SAP (μV) | SCV(m/s) | SAP (μV) | SCV(m/s) | CMAP (mV) | MCV (m/s) | Proximal and distal muscle in arm and leg | ||||
| 1 | 4.4 | 57 | 4.4 | 49 | 0.8 | 49 | Distally predominant neuropathic changes (long duration, polyphasic MUP, and reduced IP) | |||
| 2 | 6.3 | 55 | 2.3 | 34 | 0 | — | Distally predominant neuropathic changes (positive sharp waves in VM and TA, long MUP, and reduced IP in VM, no MUP in TA) | |||
| 3 | 3.7 | 47 | 1.5 | 38 | 0 | — | Distally predominant neuropathic changes (no MUP in EDB, long duration MUP in others) | |||
| 4 | 12 | 54 | 5.8 | 36 | 1.9 | 49 | Distally predominant neuropathic changes (long duration MUP and reduced IP) | |||
| 5 | 13 | 50 | 4 | 48 | — | 47 | Myopathic and distally predominant neuropathic changes (short and long duration MUP, reduced IP) | |||
| 6 | — | — | 5.3 | 43 | 0.1 | 36 | Myopathic and distally predominant neuropathic changes (short polyphasic and long duration MUP, reduced IP) | |||
SAP = sensory action potential amplitude (normal > 5 μV); SCV = sensory nerve conduction velocity (normal > 48 m/s in arm and > 38 m/s in leg); Lat mall = lateral malleolus; EDB = extensor digitorum brevis; CMAP = compound muscle action potential (normal > 1 mV recording from EDB with surface electrodes and stimulating peroneal nerve at the front of the ankle); MCV = motor nerve conduction velocity (normal > 48 m/s in arm and > 38 m/s in leg)—denotes not examined; MUP = motor unit potentials; IP = interference patterns; VM = vastus medialis; TA = tibialis anterior.