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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
  1. #Measurements following stimulation at the wrist/above elbow and at the ankle/above knee.
  2. *Calculated from samples of 20 F waves for the patients’ age and height; §duration limits were adopted from those published by EFNS/PNS [11].