• Teerin Liewluck, Christopher J Klein, and Lyell K Jones.
• Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota, 55905, USA; Department of Neurology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado, USA.
• Muscle Nerve. 2014 Mar 1; 49 (3): 351-6.

IntroductionWe investigated the clinical, electrophysiological and neural autoantibody characteristics in cramp-fasciculation syndrome (CFS) patients.MethodsWe reviewed Mayo Clinic records from 2000 to 2011 to identify clinically defined CFS patients who underwent neural autoantibody testing. Stored sera of patients who tested positive for antibodies to voltage-gated potassium channel complex (VGKC complex) were analyzed further for leucine-rich glioma-inactivated 1 (LGI1) or contactin-associated protein-2 immunoglobulin G (CASPR2-IgG) antibodies.ResultsThirty-seven patients were identified. Twelve were seropositive for neural autoantibodies. Clinical manifestations were similar in seropositive and seronegative patients, although central and autonomic neuronal hyperexcitability symptoms were more common in seropositive cases. No patients had a malignancy. Repetitive tibial nerve stimulation at 10 Hz revealed longer afterdischarges in seropositive patients. Two of 7 patients with VGKC-complex autoimmunity demonstrated LGI1 or CASPR2-IgG antibodies. Only 2 of 12 seropositive patients required immunotherapy.ConclusionsVGKC-complex autoimmunity occurs in a minority of CFS patients. Antibody positivity was associated with extramuscular manifestations, typically without malignancy. Target antigens within the VGKC complex remain unknown in most patients.Published 2013 by Wiley Periodicals, Inc. This article is a US Government work and, as such, is in the public domain in the United States of America.

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