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JOURNAL ARTICLE
Acute-onset multifocal motor neuropathy (AMMN): how we meet the diagnosis.
International Journal of Neuroscience 2012 August
Multifocal motor neuropathy (MMN) usually progresses insidiously with lower motor neuron-type weakness, minimal or no sensory symptoms. Diagnostic criteria include motor conduction block (CB) at sites not exposed to compression or entrapment. CBs may persist or reverse irrespective of clinical outcome. Acute onset with generalized weakness is uncommon. We report four patients who presented acutely areflexia, pure motor deficits without sensory disturbances, multifocal CBs persisting at the same motor nerves on serial electrophysiological studies. Three patients had preceding infections; two showed IgM reactivity against the ganglioside GM1. Intravenous immuneglobulin (IVIg) improved or stabilized symptoms. Patients 2,3,4 receive maintenance therapy with IVIg for years. Acute-onset MMN (AMMN) should be differentiated from other immune-mediated neuropathies such as acute inflammatory polyneuropathy either demyelinating (AIDP) or axonal (AMAN), acute motor conduction block neuropathy (AMCBN), acute-onset chronic inflammatory demyelinating polyneuropathy (CIDP). The correct diagnosis deserves implications for patient long-term treatment and prognosis. Moreover, the authors address the problem of defining the spectrum of MMN particularly in the acute setting.
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