↵2-150 Reference values were: motor conduction velocity (CV): common peroneal ⩾ 45, ulnar ⩾ 50, median ⩾ 48; sensory conduction velocity: sural ⩾ 48, ulnar ⩾ 53, median ⩾ 48; compound motor action potential (CMAP): common peroneal ⩾ 5, ulnar ⩾ 6, median ⩾ 7; sensory action potentials (SAP): sural ⩾ 6, ulnar ⩾ 4, median ⩾ 7.

↵2-151 An increased frequency of polyphasic potentials was found. ^‡Fibrillation potentials were present in distal leg muscles, but not in arm muscles. ^§ Fibrillation potentials were present in both leg and arm distal muscles. ^¶ In subsequent electrophysiological studies motor and sensory CVs were not measurable and severe signs of denervation (fibrillation potentials) were found in arm, and especially, leg muscles. ^** Signs of denervation (fibrillation potentials) were still present and much less evident in both arm (only distally) and leg muscles. Partial reinnervation took place (scarce interference pattern with high frequency potentials) in arm muscles and to a lesser extent in proximal leg muscles.