Table 4.
Number and percentage of patients with abnormal values of electrophysiological parameters among those without and with NP-RPN.
| Parameter | Patients without NP-RPN (n = 54; 71%) |
Patients with NP-RPN (n = 22; 29%) |
p |
|---|---|---|---|
| Median CMAP lat ≥4.1 ms (n; %) | 23 (42.6) | 14 (63.6) | 0.096 |
| Median CMAP ampl <5 mV (n; %) | 18 (33.3) | 7 (31.8) | 0.89 |
| Median MCV (m/s) elbow-wrist <50 m/s (n, %) | 19 (40.43) | 10 (47.62) | 0.57 |
| Median MCV (m/s) above elbow-elbow <50 m/s (n; %) | 8 (23.53) | 9 (52.94) | 0.036 |
| Peroneal CMAP lat ≥5.5 ms (n; %) | 17 (31.48) | 5 (22.73) | 0.44 |
| Peroneal CMAP ampl <3 mV (n; %) | 41 (75.93) | 17 (77.27) | 0.9 |
| Peroneal MCV fibular head-ankle <40 m/s (n; %) | 15 (33.33) | 2 (12.50) | 0.11 |
| Peroneal MCV popliteal fossa-fibular head <40 m/s (n; %) | 12 (27.91) | 7 (41.18) | 0.31 |
| Ulnar CMAP lat ≥4.1 ms (n; %) | 10 (20.0) | 4 (18.18) | 0.85 |
| Ulnar CMAP ampl <6 mV (n; %) | 0 | 0 | 1 |
| Ulnar MCV (m/s) below elbow-wrist <50 m/s (n; %) | 14 (31.11) | 8 (40.00) | 0.48 |
| Ulnar MCV (m/s) above elbow-below elbow | 23 (53.49) | 7 (36.84) | 0.23 |
| EX <50 m/s (n; %) | |||
| Median SNAP ampl <10 µV (n; %) | 48 (88.89) | 22 (100) | 0.1 |
| Median SCV <50 m/s (n; %) | 47 (87.04) | 20 (90.91) | 0.63 |
| Sural SNAP ampl <7 µV (n; %) | 44 (81.48) | 18 (81.82) | 0.97 |
| Sural SCV <40 m/s (n; %) | 37 (68.58) | 11 (52.38) | 0.19 |
| Ulnar SNAP ampl <6 µV (n; %) | 45 (83.33) | 14 (63.64) | 0.06 |
| Ulnar SCV <50 m/s (n; %) | 31 (57.41) | 9 (40.91) | 0.19 |
Legend: NP-RPN—neuropathic pain related to peripheral neuropathy; n—number of patients; CMAP—compound muscle action potential; lat—distal latency; ampl—amplitude; MCV—motor conduction velocity; SNAP—sensory nerve action potential; SCV—sensory conduction velocity.