Which motor strength findings are characteristic of multifocal motor neuropathy (MMN) with conduction block?

Updated: Nov 12, 2018
  • Author: Sasa Zivkovic, MD, PhD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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Asymmetric weakness may occur in a nonmyotomal pattern, usually in the distribution of individual nerves. The upper limbs, particularly the hands, are more commonly involved than the lower limbs. Weakness of respiratory muscles is very rare. [15] Weakness frequently worsens with exposure to cold. [16]

Muscles innervated by motor nerves with persistent conduction block are usually weak.

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