Table 4.
Descriptive statistics of electroneurographic assessment (ENoG) parameters in the severity subgroups. N.V., normal values according to the laboratory; aSNAP, amplitude of sensory action potential; aCMAP, amplitude of compound muscle action potential. Results are represented as mean (SD).
| ENoG Parameters | Mild Axonal Sensory PNP n = 10 |
Moderate Sensory Axonal PNP n = 10 |
Severe Sensory Axonal PNP with Axonal Motor Loss n = 15 |
|---|---|---|---|
| aSNAP Sural nerve (µV) (N.V.1 > 6) (unobtained in 8 subjects) |
4.43 (0.73) | 2.14 (1.805) | 1.66 (1.731) |
| Sensory NCV Sural nerve (m/s) (N.V. > 40) |
54.64 (9.691) | 51.21 (14.449) | 46.23 (9.884) |
| aSNAP Superficial peroneal nerve (µV) (N.V. > 6) (unobtained in 24 subjects) |
1.76 (1.985) | 0.28 (0.533) | 0.29 (0.605) |
| Sensory NCV Superficial peroneal nerve (m/s) (N.V. > 40) | 42.38 (3.757) | 51.1 (7.882) | 43.1 (21.140) |
| aSNAP Radial nerve (µV) (N.V. > 20) |
21.53 (7.627) | 18.27 (3.959) | 8.82(5.944) |
| Sensory NCV Radial nerve (m/s) (N.V. > 50) |
60.54 (5.135) | 62.19 (10.385) | 55.49 (13.689) |
| aSNAP Median nerve (µV) (N.V. > 10) |
18.15 (5.502) | 20.5 (0.707) | 7.21(3.061) |
| Sensory NCV Median nerve (m/s) (N.V. > 50) |
55.05 (8.878) | 69.00 (18.385) | 49.89 (14.189) |
| aCMAP Tibial nerve (mV) (N.V. > 4) |
9.36 (3.162) | 8.78 (3.063) | 5.01 (3.574) |
| Motor NCV Tibial nerve (m/s) (N.V. > 40) |
46.74 (4.599) | 51.43 (7.501) | 49.71 (9.193) |
| aCMAP Median nerve (mV) (N.V. > 4) |
6.52 (1.825) | 4.30 (0.00) | 5.54 (2.148) |
| Motor NCV Median (m/s) (N.V. > 50) |
53.87 (3.629) | 65.60 (0.00) | 53.93 (6.823) |
| aCMAP Common peroneal nerve (mV) (N.V. > 2) |
4.69 (1.92) | 6.14 (2.348) | 2.67 (2.603) |
| Motor NCV Common peroneal nerve (m/s) (N.V. > 40) | 50.07 (8.94) | 46.41 (4.309) | 49.11 (6.562) |
1 N.V.—normal values according to the laboratory.