Abnormal findings of NCS in 40 patients with CCPD
| Total† | Median‡ | Ulnar‡ | Tibial‡ | Sural‡ | |
|---|---|---|---|---|---|
| Motor nerve | |||||
| Decreased MCV | 31/40 (77.5) | 55/69 (79.7) | 47/66 (71.2) | 46/63 (73.0) | |
| Prolonged distal latency | 21/40 (52.5) | 31/67 (46.3) | 28/62 (45.2) | 22/59 (37.3) | |
| Decreased or absent CMAP | 22/40 (55.0) | 19/70 (27.1) | 26/69 (37.7) | 44/70 (62.9) | |
| Conduction block | 11/40 (27.5) | 20/64 (31.3) | 22/61 (36.1) | 20/59 (33.9) | |
| Temporal dispersion | 16/40 (40.0) | 23/67 (34.3) | 27/64 (42.2) | 23/58 (39.7) | |
| Prolonged F-wave latency | 28/40 (70.0) | 38/54 (70.4) | 29/45 (64.4) | 34/41 (82.9) | |
| Decreased F-wave occurrence | 19/40 (47.5) | 28/58 (48.3) | 24/50 (48.0) | 21/50 (42.0) | |
| Sensory nerve | |||||
| Decreased SCV | 17/40 (42.5) | 20/53 (37.7) | 30/49 (61.2) | 17/38 (44.7) | |
| Decreased or absent SNAP | 35/40 (87.5) | 41/66 (62.1) | 50/68 (73.5) | 43/60 (71.7) | |
†Patients with indicated abnormalities in any one of the three nerves were regarded as abnormal (numbers of abnormal patients/total numbers of patients examined).
‡Numbers of abnormal nerves/total numbers of nerves examined.
CCPD, combined central and peripheral demyelination; CMAP, compound muscle action potential; MCV, motor nerve conduction velocity; NCS, nerve conduction study; SCV, sensory nerve conduction velocity; SNAP, sensory nerve action potential.