Clinical analysis of four cases of anti GQ1b syndrome / 中华儿科杂志

Objective@#To investigate the clinical manifestations, laboratory findings, treatment and outcome of anti-GQ1b antibody syndrome.@*Method@#The clinical manifestations, laboratory examination, diagnosis, treatment and prognosis of (4 patients 4 male patients, from 4 to 12 years) with anti-GQ1b syndrome in Beijing Children's Hospital affiliated to Capital Medical University from 2015 to 2016 were retrospectively analyzed.@*Result@#All 4 children presented with ataxia. Case 1 showed impaired speech, ptosis and weakness of arms; case 2 and 3 had external ophthalmoplegia, weakness of limbs; case 4 presented hypersomnia, irritability and hallucinations. Serum anti-GQ1b-IgG antibody was positive in all cases. Case 1-3 received lumber puncture at the course of 1-2 weeks, CSF presented albuminocytological dissociation, case 4 had CSF pleocytosis and increased protein level. Brain MRI of Case 1-2 were normal; Case 3 showed long T1 and T2 signal in cerebellar dentate nucleus, pons and corpus callosum; Case 4 showed long T1 and T2 signal in bilateral centrum semiovale, basal ganglia, external capsule, insula and cerebellum. Electromyograms of case 1-3 showed peripheral axonal lesion. All children were treated with IVIG. After treatment, condition of all patients were improved. According to the clinical manifestation, laboratory examination, and outcome after treatment, case 1 was diagnosed as anti-GQ1b antibody syndrome (Pharyngeal-Cervical-Brachial weakness overlapped with Miller Fisher syndrome), case 2 and 3 were diagnosed as anti-GQ1b antibody syndrome (Miller Fisher syndrome overlapped with Guillain Barré syndrome) and case 4 was diagnosed as anti-GQ1b antibody syndrome (acute ataxia hypersomnolence).@*Conclusion@#When patients with the presence of prodromic infections, monophasic course, drowsiness, ataxia, ophthalmoplegia, weakness and the symptoms/signs are relatively symmetric, anti-GQ1b antibody syndrome should be considered. Anti-GQ1b antibody has important significance for diagnosis. Most children have a good prognosis. Early correct diagnosis can avoid unnecessary examinations and guide appropriate use of immunotherapy.

Three Cases of Anti-GQ1b Antibody Syndrome with Internal Ophthalmoplegia

The anti-GQ1b IgG antibody is associated with Guillain-Barre syndrome (GBS) with ophthalmoplegia, Bickerstaff's brainstem encephalitis, acute ophthalmoparesis without ataxia, and ataxic GBS without ophthalmoplegia as well as Miller Fisher syndrome. Only limited numbers of patients with acute ophthalmoparesis without ataxia are known to show internal ophthalmoplegia. We report three patients with internal ophthalmoplegia from anti-GQ1b antibody syndrome.