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J Clin Neurosci. 2017 Jul;41:63-66. doi: 10.1016/j.jocn.2017.02.063. Epub 2017 Apr 21.

Isaacs syndrome with CASPR2 antibody: A series of three cases.

Author information

1
Department of Neurology, Huashan Hospital, Fudan University, Shanghai, China.
2
Department of Electromyography, Huashan Hospital, Fudan University, Shanghai, China.
3
Department of Neurology, Huashan Hospital, Fudan University, Shanghai, China. Electronic address: xijianying@fudan.edu.cn.
4
Department of Neurology, Huashan Hospital, Fudan University, Shanghai, China; Department of Neurology, Jing'an District Central Hospital, Shanghai, China.

Abstract

Isaacs syndrome is a form of peripheral nerve hyperexcitability, characterized by spontaneous muscle twitching and stiffness. Some patients are reported to be positive for CASPR2 antibody that may be one of the pathogenic autoantibodies in Isaacs syndrome. We reported a series of three patients with Isaacs syndrome, including their clinical features, electrophysiologic findings, laboratory parameters and therapeutic responses. All the three patients were positive for CASPR2 antibodies examined on transfected human embryonic kidney 293 cells by indirect immunofluorescence method. One patient had invasive thymoma. Symptomatic treatment was not sufficient for them, while immunotherapies including corticosteroids, double filtration plasmapheresis and rituximab provided favorable outcomes. The titers of CASPR2 antibody decreased after immune modulating therapy in parallel to clinical improvements in two patients.

KEYWORDS:

CASPR2 antibody; Immunotherapy; Isaacs syndrome

PMID:
28438465
DOI:
10.1016/j.jocn.2017.02.063
[Indexed for MEDLINE]

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