Electrophysiological study of patients II-5 and III-13
| Motor nerves | Sensory nerves | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MNCV (m/s) | DL (ms) | CMAP (mV) | F-wave latency (ms) | SNCV (m/s) | DL (ms) | SNAP (µV) | ||||||||
| II-5 | III-13 | II-5 | III-13 | II-5 | III-13 | II-5 | III-13 | II-5 | III-13 | II-5 | III-13 | II-5 | III-13 | |
| MNCV, motor nerve conduction velocities; SNCV, sensory nerve conduction velocities; CMAP, compound action motor potential; SNAP, sensory nerve action potential; DL, distal latency; L, left; R, right; ND, not done; UR, unrecordable. | ||||||||||||||
| Note the reduced or abolished CMAP* and reduced SNAP† with normal or slightly reduced MNCV proportional to the reduction of CMAP. | ||||||||||||||
| Peroneal (R/L) | UR/35.1 | 49/54 | UR/6 | 4.2/4.1 | UR/2* | 7.4/6.5 | UR/UR | UR/UR | ND | 29 | ND | 3.8 | ND | 2.2† |
| Ulnar (L) | 45 | ND | 3.8 | ND | 5.7 | ND | 35.7 | ND | 43.1 | 50.3 | 2.9 | 1.7 | 1.5† | 8.3† |
| Posterior tibial (R/L) | 32.7/32.8 | ND/57.7 | 6.1/5.4 | ND/4.9 | 0.2/0.3* | ND/8.6 | UR/UR | ND/46 | ||||||
| Median (L) | 42.6 | 54.3 | 4.6 | 2.8 | 4.8 | 8.9 | 35 | 28 | ||||||
| Sural (R/L) | 37.1/37.8 | 31/30 | 3.5/3.7 | 3.5/3 | 3.7/3.3† | 1.8/2.2† | ||||||||
| Radial (R/L) | 51.9/44.2 | ND/42.9 | 1.8/2.4 | ND/2.1 | 3.6/3.1† | ND/8† | ||||||||