Table 2 Nerve conduction studies of the patient
Nerve (muscle studied) | Variable | Initial study | Follow-up study | Normal value | ||
|---|---|---|---|---|---|---|
Right | Left | Right | Left | |||
Motor nerves | ||||||
Median (abductor pollicis brevis—wrist) | Distal latency (ms) | Not done | 3.3 | 3.4 | ≤ 4.5 | |
Amplitude (mV) | 9.9 | 13.5 | ≥ 5.9 | |||
Conduction velocity (m/s) | 57.9 | 58.6 | ≥ 50 | |||
Ulnar (abductor digiti minimi—elbow) | Distal latency (ms) | Not done | 7.3 | 6.9 | ≤ 3.7 | |
Amplitude (mV) | 5.1 | 5.7 | ≥ 7.9 | |||
Conduction velocity (m/s) | 61.4 | 61.9 | ≥ 50 | |||
Fibular (extensor digitorum brevis—ankle) | Distal Latency (ms) | 3.4 | 4.1 | 3.2 | 4.6 | ≤ 6.5 |
Amplitude (mV) | 3.1 | 3.0 | 4.6 | 5.4 | ≥ 4 | |
Conduction velocity (m/s) | 42.2 | 40.5 | 43.9 | 43.0 | ≥ 42 | |
Tibial (abductor hallucis—medial malleolous) | Distal latency (ms) | 4.6 | 4.4 | 3.8 | 4.8 | ≤ 5.1 |
Amplitude (mV) | 5.0 | 6.7 | 7.2 | 8.6 | ≥ 5.8 | |
Conduction velocity (m/s) | 41.9 | 43.4 | 41.5 | 47.9 | ≥ 38 | |
Sensory nerves | ||||||
Median (second digit, wrist) | Onset latency (ms) | Not done | 2.4 | 2.3 | ≤ 3.3 | |
Peak latency (ms) | 3.2 | 3.3 | ≤ 4 | |||
Amplitude (µV) | 15.1 | 18.7 | ≥ 11 | |||
Ulnar (fifth digit) | Onset latency (ms) | Not done | 2.2 | 2.0 | ≤ 3.1 | |
Peak latency (ms) | 2.9 | 2.8 | ≤ 4 | |||
Amplitude (µV) | 12.2 | 11.3 | ≥ 10 | |||
Medial antebrachial cutaneous | Onset latency (ms) | Not done | 1.6 | 1.6 | ≤ 2.2 | |
Peak latency (ms) | 2.3 | 2.3 | ≤ 2.6 | |||
Amplitude (µV) | 15.8 | 22.3 | ≥ 4 | |||
Sural | Onset latency (ms) | 1.7 | 2.0 | 2.3 | 2.3 | ≤ 3.6 |
Peak latency (ms) | 2.8 | 3.2 | 3.1 | 3.4 | ≤ 4.5 | |
Amplitude (µV) | 8.2 | 7.6 | 16.0 | 13.1 | ≥ 5 | |