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Open Access Research article

Deterioration after corticosteroids in CIDP may be associated with pure focal demyelination pattern

Filip Eftimov*, Marinus H Liesdek, Camillus Verhamme, Ivo N van Schaik and on behalf of the PREDICT study group

Author Affiliations

Department of Neurology, Academic Medical Center, University of Amsterdam, Amsterdam, DD, 1100, The Netherlands

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BMC Neurology 2014, 14:72  doi:10.1186/1471-2377-14-72

Published: 4 April 2014

Abstract

Background

In the PREDICT study, a randomised controlled trial comparing dexamethasone with prednisolone in patients with chronic inflammatory demyelinating polyradiculoneuropathy (CIDP), almost a quarter of patients deteriorated soon after starting treatment. The primary objective of this post-hoc analysis was to test the hypothesis that a focal demyelination pattern is associated with early deterioration after corticosteroid treatment and to explore whether various clinical characteristics are associated with deterioration after corticosteroid treatment.

Methods

Clinical outcome was categorised into early deterioration and non-early deterioration. A neurophysiologist blinded for treatment outcome scored electrophysiological data into following categories: pure focal versus non-focal distribution of demyelination and no/minor versus moderate/severe sensory involvement. Additionally, we compared electrophysiological and clinical baseline parameters, with emphasis on previously reported possible associations.

Results

Early deterioration was found in 7 out of 33 patients (21%). Ten patients had pure focal distribution of demyelination, of whom 5 had early deterioration; 23 patients had non-focal distribution, of whom 2 had early deterioration (pā€‰=ā€‰0.02). Higher mean median nerve sensory nerve conduction velocity (SNCV) was found in patients with early deterioration compared to patients with non-early deterioration (52.6 and respectively 40.8 m/s, pā€‰=ā€‰0.02).

Conclusion

Pure focal distribution of demyelination and lesser sensory electrophysiological abnormalities may be associated with early deterioration in CIDP patients treated with corticosteroids.

Keywords:
Chronic inflammatory demyelinating polyneuropathy; CIDP; Deterioration; Corticosteroids