Abstract:
OBJECTIVE:To assess if multifocal motor neuropathy (MMN) with and MMN without conduction block (CB) are similar or distinct diseases. METHODS:The authors reviewed the clinical features and responses to IV immunoglobulin (IVIg) treatment of patients with MMN with and without CB at diagnosis, after 4 years of follow-up and at the last examination. They included all patients showing clinical features of MMN who had been followed for at least 4 years: All had asymmetric purely motor weakness with a peripheral nerve distribution, without any sensory, bulbar, or respiratory signs and without any upper motor neuron involvement. RESULTS:Twenty patients had CB and 13 had no CB. Median follow-up time was 7 years. There were no differences between the two groups in term of age, sex, time from onset to diagnosis, anti-GM1 antibody titers, or CSF data. Nerve distribution, number of affected limb regions, predominant weakness in distal upper extremities, asymmetric weakness, cramps, fasciculations, and Medical Research Council sum-scores in upper and lower limbs were comparable at diagnosis, 4 years of follow-up, and last examination. Few significant differences were observed. Involvement of median nerve was less frequent at 4 years of follow-up (14/20 vs 4/13; p = 0.027) and at the last examination (17/20 vs 5/13; p = 0.009) in patients without CB. Proximal weakness was less frequent in patients with MMN without CB at the last examination (7/20 vs 0/13; p = 0.027). Fewer nerves were involved in patients without CB at the last examination (4.5 vs 2; p = 0.04). Efficacy of IVIg was similar in MNN patients without CB (8/13) and with CB (14/20; p > 0.05). CONCLUSION:After a median follow-up time of 7 years, patients with and without conduction block showed similar clinical features and a similar response to IV immunoglobulin treatment.
journal_name
Neurologyjournal_title
Neurologyauthors
Delmont E,Azulay JP,Giorgi R,Attarian S,Verschueren A,Uzenot D,Pouget Jdoi
10.1212/01.wnl.0000234063.51897.20subject
Has Abstractpub_date
2006-08-22 00:00:00pages
592-6issue
4eissn
0028-3878issn
1526-632Xpii
67/4/592journal_volume
67pub_type
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