Bickerstaff's brainstem encephalitis and Fisher syndrome form a continuous spectrum: Clinical analysis of 581 cases

• Published in: Journal of neurology 2008-05, Vol.255 (5), p.674-682
• Main Authors: Ito, M., Kuwabara, S., Odaka, M., Misawa, S., Koga, M., Hirata, K., Yuki, N.
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Age Distribution; Aged; Aged, 80 and over; Antibodies; Ataxia; Autoantibodies - blood; Biological and medical sciences; Brain Stem - immunology; Brain Stem - pathology; Brain Stem - physiopathology; Campylobacter; Campylobacter Infections - complications; Campylobacter Infections - immunology; Causality; Child; Child, Preschool; Consciousness; Electroencephalography; Encephalitis; Encephalitis - diagnosis; Encephalitis - epidemiology; Encephalitis - physiopathology; Female; Gangliosides - immunology; Humans; Infant; Infant, Newborn; Infections; Japan - epidemiology; Leukocytes; Magnetic Resonance Imaging; Male; Medical records; Medical sciences; Medicine; Medicine & Public Health; Middle Aged; Miller Fisher Syndrome - diagnosis; Miller Fisher Syndrome - epidemiology; Miller Fisher Syndrome - physiopathology; Neurology; Neuroradiology; Neurosciences; Original Communication; Patients; Peripheral Nerves - immunology; Peripheral Nerves - physiopathology; Reflex, Abnormal - immunology; Serology; Sex Distribution; Terminology as Topic; Tumors of the nervous system. Phacomatoses
• ISSN: 0340-5354; 1432-1459
• DOI: 10.1007/s00415-008-0775-0

Whether Bickerstaff's brainstem encephalitis (BBE) is a distinct disease or a subtype of Fisher syndrome (FS) is unclear as there have been no clinical studies with sufficiently large numbers of patients with FS or BBE. Our aim was to clarify the nosological relationship. Medical records of patients suffering acute ophthalmoplegia and ataxia within four weeks of onset were reviewed. BBE was the diagnosis for patients with impaired consciousness, FS for those with clear consciousness and areflexia. Clinical features, neuroimages, and laboratory findings were analyzed. Patients were grouped as having BBE (n = 53), FS (n = 466), or as unclassified (n = 62). The BBE and FS groups had similar features; positive serum anti-GQ1b IgG antibody (68 % versus 83 %), antecedent Campylobacter jejuni infection (23 % versus 21 %), CSF albuminocytological dissociation (46 % versus 76 %), brain MRI abnormality (11 % versus 2 %), and abnormal EEG findings (57 % versus 25 %). BBE (n = 4) and FS (n = 28) subgroups underwent detailed electrophysiological testing. Both groups frequently showed absent soleus H-reflexes, but normal sensory nerve conduction (75 % versus 74 %) and a 1-Hz power spectrum peak on postural body sway analysis (67 % versus 72 %). Common autoantibodies, antecedent infections, and MRI and neurophysiological results found in this large study offer conclusive evidence that Bickerstaff's brainstem encephalitis and Fisher syndrome form a continuous spectrum with variable CNS and PNS involvement.