Table 1 Electrophysiological results in two patients with clinically pure sensory deficits
From: Pure sensory chronic inflammatory polyneuropathy: rapid deterioration after steroid treatment
Motor conduction | ||||||
Ulnar nerve | Fibular nerve | |||||
Pt. 1 | Pt. 2 | Normal limit | Pt. 1 | Pt. 2 | Normal limit | |
Distal latency (ms) | 2.8 | 3.1 | <3.5 | 3.7 | 4.8 | <5.0 |
Amplitude (mV)# | 8.3/8.0 | 6.8/6.4 | >5.0 | 3.9/3.2 | 3.4/3.1 | >2.0 |
Duration (ms)# | 4.6/5.3 | 5.1/5.7 | <6.7§ | 4.8/5.4 | 6.3/6.5 | <7.6§ |
Velocity (m/s) | 60 | 50 | ≥50 | 46 | 39 | ≥41 |
F wave lat. min/max (ms) | 31/35 | 32/37 | <32/35* | 50/61 | 55/69 | <55/64* |
F wave persistence (%) | 90 | 80 | >70 | 70 | 50 | >20 |
Sensory conduction | ||||||
Median nerve | Ulnar nerve | |||||
Pt. 1 | Pt. 2 | Normal limit | Pt. 1 | Pt. 2 | Normal limit | |
Amplitude (μV) | 2.0 | Absent | >10 | 1.7 | Absent | >7 |
Velocity (m/s) | 48 | - | ≥50 | 56 | - | ≥45 |
Radial nerve | Sural nerve | |||||
Pat1 | Pat2 | Normal limit | Pat 1 | Pat 2 | Normal limit | |
Amplitude (μV) | 5.9 | 4.5 | >15 | 14 | 3.4 | >7 |
Velocity (m/s) | 63 | 58 | ≥55 | 62 | 43 | ≥45 |