Volume 23, Issue 2 pp. 164-174
Main Article

Long-term clinical and neurophysiological follow-up of patients with peripheral, neuropathy associated with benign monoclonal gammopathy

Sawanthana Ponsford BSc, FRCP

Corresponding Author

Sawanthana Ponsford BSc, FRCP

Department of Clinical Neurophysiology, Walsgrave Hospital, Clifford Bridge Road, Coventry, CV2 2DX, UK

Department of Clinical Neurophysiology, Walsgrave Hospital, Clifford Bridge Road, Coventry, CV2 2DX, UKSearch for more papers by this author
Hugh Willison PhD, FRCP

Hugh Willison PhD, FRCP

Department of Neurology, Southern General Hospital, Glasgow, UK

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Jean Veitch

Jean Veitch

Department of Neurology, Southern General Hospital, Glasgow, UK

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Richard Morris PhD

Richard Morris PhD

Department of Primary Care and Population Sciences, Royal Free and University College Medical School, London, UK

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P.K. Thomas DSc, FRCP

P.K. Thomas DSc, FRCP

Department of Clinical Neurology, Institute of Neurology, London, UK

Department of Clinical Neurosciences, Royal Free and University College Medical School, London, UK

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Presented in part at the XI International Congress of EMG and Clinical Neurophysiology, Prague, September 1999.

Abstract

The incidence of hematological malignancy in patients with monoclonal gammopathy of undetermined significance (MGUS) has been assessed as 17% to 25%. To ascertain whether this is true of neuropathy associated with MGUS, a long-term (5–42 years) retrospective clinical and neurophysiological follow-up was conducted in 50 cases (immunoglobulin M [IgM], n = 38; IgG, n = 11; IgA, n = 1). Only three patients developed hematological malignancy. Of 25 survivors with IgM paraproteinemia, 7 had myelin-associated glycoprotein antibodies with typical clinical features. Evoked distal muscle amplitudes were significantly smaller than for the other paraprotein classes. Preferential distal demyelination manifested by relative prolongation of distal motor latency was not apparent in the cases of long duration. Two patients with IgM antidisialosyl antibodies and cold agglutinating activity had a large fiber neuropathy with intermittent oculofacial involvement. Both responded to intravenous immunoglobulin. Findings in the remaining patients were varied. Recognition of IgM subgroups is important both for prognosis and possible response to treatment. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 164–174, 2000.

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