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  • Title: Bickerstaff's brainstem encephalitis associated with IgM antibodies to GM1b and GalNAc-GD1a.
    Author: Matsuo M, Odaka M, Koga M, Tsuchiya K, Hamasaki Y, Yuki N.
    Journal: J Neurol Sci; 2004 Feb 15; 217(2):225-8. PubMed ID: 14706228.
    Abstract:
    This is the first report of a case of Bickerstaff's brainstem encephalitis (BBE) associated with IgM antibodies to GM1b and GalNAc-GD1a. Subsequent to Campylobacter jejuni enteritis, the patient rapidly developed consciousness disturbance and hyperreflexia in addition to external ophthalmoplegia and cerebellar-like ataxia. EEG showed transient 7 Hz monorhythmic theta activities, predominantly in the front-central area. He received high doses of immunoglobulin intravenously and had completely recovered 3 months later. High anti-GM1b and anti-GalNAc-GD1a IgM antibody titers present during the acute phase decreased with his clinical improvement. An absorption study showed the anti-GM1b and anti-GalNAc-GD1a IgM antibodies to be cross-reactive. Anti-GM1b and anti-GalNAc-GD1a antibodies have been detected in some patients who developed Guillain-Barré syndrome after C. jejuni enteritis, whereas the anti-GQ1b IgG antibody is associated with BBE. Infection by C. jejuni bearing a GM1b-like or GalNAc-GD1a-like lipooligosaccharide may trigger the production of anti-GalNAc-GD1a and anti-GM1b IgM antibodies. It is not clear why our patient developed BBE rather than Guillain-Barré syndrome. These antibodies may, however, prove useful serological markers for identifying BBE patients who do not have the anti-GQ1b IgG antibody.
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