Conduction block in neuralgic amyotrophy

We describe two cases of neuralgic amyotrophy with electrophysiological evi dence of conduction block across the lower trunk of the brachial plexus. Lo w-output impedance stimulation of the cervical spinal roots in combination with collision was used to accurately demonstrate the conduction block. Com plete electrophysiological recovery of the conduction block occurred within 3 months. Early clinical and electrophysiological recovery in both patient s suggests that, in some cases, demyelination may predominate early in the course of neuralgic amyotrophy. (C) 2001 John Wiley & Sons. Inc.