Clinical and electrophysiological features of multifocal motor neuropathy / 临床神经病学杂志

ABSTRACT

Objective To study clinical and electrophysiological features of multifocal motor neuropathy (MMN). Methods The clinical features and data of electrophysiological examination from 16 patients with MMN were analyzed retrospectively.Results In the present study, the onset age was 14 to 47 years with the mean age of (28.2?2.4) years. All the 16 patients presented with unsymmetrical weakness of extremities (Ⅱ～Ⅳ grade of muscle strength) and no hypoesthesia. More serious weakness was found in the upper limbs and in the right extremities. 4 cases were accompanied with mild amyotrophy. Electromyography showed segment conduct block (CB) and slow down of conduct velocity of motor nerves in all 16 patients. Slow conduct velocity of sensory nerve was found only in one case.Conclusions MMN is an unsymmetrical peripheral neuropathy, which affects mainly on motor nerve. Nerve electrophysiology plays an important role in diagnosis of MMN and CB is the characteristic manifestation of nerve electrophysiological change in MMN.