Table 3.
Nerve conduction study findings in patients and healthy controls
| COVID-19 patients (n = 76) Mean ± SD (min–max) |
Healthy controls (n = 44) Mean ± SD (min–max) |
p-value | |
|---|---|---|---|
| Median sensory first digit | |||
| Latency | 1.9 ± 0.3 (1.5–2.8) | 1.9 ± 0.2 (1.5–2.4) | 0.473 |
| SNAP amplitude | 34.5 ± 14.7 (14–73) | 36.5 ± 15.3 (15–70) | 0.350 |
| Conduction velocity | 52.9 ± 6.9 (37–69) | 52.5 ± 5.6 (42–68) | 0.946 |
| Ulnar sensory fifth digit | |||
| Latency | 1.9 ± 0.2 (1.5–2.6) | 1.9 ± 0.2 (1.5–2.4) | 0.974 |
| SNAP amplitude | 37.7 ± 16.4 (15–100) | 33.4 ± 12.7 (14–70) | 0.179 |
| Conduction velocity | 57.7 ± 5.9 (48–72) | 58.2 ± 5.7 (45–69) | 0.450 |
| Median motor nerve | |||
| Distal motor latency | 3.1 ± 0.5 (1.7–4.6) | 3.1 ± 0.5 (2.3–4.2) | 0.565 |
| CMAP amplitude | 14.9 ± 3.8 (8–25) | 13.4 ± 4.1 (7–22) | 0.096 |
| Conduction velocity | 57.3 ± 4 (50–69) | 55.9 ± 4.6 (48–69) | 0.172 |
| F wave latency | 26.1 ± 2.7 (21.4–41.7) | 25.6 ± 1.8 (22.6–30.9) | 0.344 |
| Ulnar motor nerve | |||
| Distal motor latency | 2.3 ± 0.3 (1.6–3) | 2.2 ± 0.4 (1.7–3.6) | 0.090 |
| CMAP amplitude | 14.9 ± 3.5 (8–28) | 13.8–2.8 (10–24) | 0.149 |
| Conduction velocity | 59.6 ± 5.2 (42–73) | 58.3 ± 5.6 (48–71) | 0.106 |
| F wave latency | 26.4 ± 3.0 (21.7–44.5) | 26.6 ± 4.7 (23.6–54) | 0.416 |
| Posterior Tibial motor nerve | |||
| Distal motor latency | 4.1 ± 0.8 (2.8–6.4) | 4.1 ± 0.6 (2.8–6) | 0.779 |
| CMAP amplitude | 13.7 ± 4.7 (4–26) | 12.6 ± 4.5 (5–24) | 0.345 |
| Conduction velocity | 44.8 ± 3.7 (38–59) | 45.9 ± 4.3 (40–56) | 0.368 |
| F wave latency | 48.5 ± 4.4 (35.8–59.6) | 48.1 ± 3.0 (41.1–54.7) | 0.544 |
| Peroneal motor nerve | |||
| Distal motor latency | 3.6 ± 0.7 (2.2–5.7) | 3.8 ± 0.9 (2.2–6.1) | 0.266 |
| CMAP amplitude | 7.7 ± 3.1 (2–20) | 7.1 ± 2.9 (2–15) | 0.272 |
| Conduction velocity | 49.5 ± 5.3 (40–68) | 48.4 ± 3.8 (40–59) | 0.540 |
| F wave latency | 47.5 ± 4.5 (38.5–57.9) | 46.8 ± 2.9 (40.8–53.5) | 0.642 |
| Sural sensory | |||
| Latency | 2.4 ± 0.5 (1.6–3.9) | 2.5 ± 0.6 (1.5–4.5) | 0.514 |
| SNAP amplitude | 19.6 ± 6.9 (5–40) | 21.7 ± 6.9 (6–37) | 0.423 |
| Conduction velocity | 51.6 ± 5.9 (42–67) | 51.2 ± 7.2 (42–74) | 0.076 |
Nerve conduction study results for the studied cases. Latency (in ms); CMAP amplitude (in mV); conduction velocity (in m/s); F wave latency (in ms). Abbreviations: CMAP compound muscle action potential, SNAP sensory nerve action potential. A p-value < 0.05 is significant