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Neuronal antibodies in adult patients with new-onset seizures: A prospective study

Artikel i vetenskaplig tidskrift
Författare Johan Zelano
Markus Axelsson
Radu Constantinescu
Clas Malmeström
E. Kumlien
Publicerad i Brain and Behavior
Volym 9
Nummer/häfte 11
Sidor 5
ISSN 2162-3279
Publiceringsår 2019
Publicerad vid Institutionen för neurovetenskap och fysiologi
Sidor 5
Språk en
Länkar dx.doi.org/10.1002/brb3.1442
Ämnesord autoimmune, epilepsy, seizure, autoantibodies, epilepsy, prevalence, diagnosis, Behavioral Sciences, Neurosciences & Neurology
Ämneskategorier Neurovetenskaper

Sammanfattning

Objectives Immunotherapy in addition to antiepileptic drugs can improve seizure freedom rates in autoimmune epilepsy, highlighting the importance of early diagnosis. A diagnosis of autoimmune epilepsy can be supported by presence of serum antibodies to neuronal antigens. We asked how often neuronal antibodies are found in the serum of unselected adult patients with new-onset seizures and whether such testing could improve detection of autoimmune epilepsy. Material and Methods We included 44 patients over the age of 25 presenting after at least one unprovoked seizure to the Neurology Clinic at Sahlgrenska University Hospital, Gothenburg, Sweden. The median time between the first-ever seizure in life and the serum sampling was 50 days (range 22-11,000). Antibody testing in serum was performed according to the manufacturer's instructions. The patients were followed for at least 1 year. Results Epilepsy could be diagnosed already at the first visit in 21/44 patients (47.7%). Two patients (4.5%) were positive for neuronal antibodies: one against contactin-associated protein 2 (CASPR-2) and one against glutamate acid decarboxylase (GAD). Three patients (6.7%) displayed very weak immunoreactivity that was deemed clinically insignificant. One of the antibody-positive patients had only a single seizure. The other had a focal cortical dysplasia and was seizure-free on levetiracetam. None of the five patients with antibodies or immunoreactivity displayed any feature of autoimmune epilepsy. Conclusions We conclude that indiscriminate testing in patients presenting to a first seizure clinic with new-onset seizures or epilepsy is unlikely to improve detection of autoimmune epilepsy.

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