Isolated seizures are a common early feature of paraneoplastic anti-GABAB receptor encephalitis.

Abstract:

OBJECTIVE:To report the clinical features and long-term outcome of 22 newly diagnosed paraneoplastic patients with GABAB receptor antibodies (GABABR-Abs). METHODS:Retrospective clinical study of CSF-confirmed cases of GABABR-Abs encephalitis. RESULTS:We identified 22 patients (4 female) with GABABR-Abs, with a median age of 64 years (range 55-85). All were paraneoplastic: 20 small-cell lung cancer, one malignant thymoma, and one uncharacterized lung mass. The most frequent first symptom was the isolated recurrent seizures without cognitive inter-ictal impairment in 17 patients (77%). In the other, three presented the first behavioral disorders and two presented de novo status epilepticus (SE). After a median delay of 10 days (range 1-30), the recurrent seizures' phase was followed by an encephalitic phase characterized by confusion in 100% of cases and SE in 81% (n = 17), with 53% (n = 9) non-convulsive SE. Dysautonomic episodes were frequent (36%, n = 8, bradycardia and central apnea) and killed three patients. CSF study was abnormal in 95% of the cases (n = 21). At the encephalitic phase, MRI showed a temporal FLAIR hypersignal in 73% (n = 16) of the cases. First-line immunotherapy was initiated after a median delay of 26 days (range 6-65) from disease onset, and a partial response was observed in 10 out of 20 patients (50%). There was no complete response. Two years after onset, a massive anterograde amnesia affected all still alive patients. Nine patients died from cancer progression (median survival: 1.2 years). CONCLUSION:Paraneoplastic GABABR-Abs encephalitis is characterized by a stereotype presentation with an epilepsy phase before an encephalitic phase with dysautonomia. The functional prognosis is poor.

journal_name

J Neurol

journal_title

Journal of neurology

authors

Maureille A,Fenouil T,Joubert B,Picard G,Rogemond V,Pinto AL,Thomas L,Ducray F,Quadrio I,Psimaras D,Berzero G,Antoine JC,Desestret V,Honnorat J

doi

10.1007/s00415-018-9132-0

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

195-206

issue

1

eissn

0340-5354

issn

1432-1459

pii

10.1007/s00415-018-9132-0

journal_volume

266

pub_type

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