Background: Prospective observations of functional recovery are lacking in patients with autoimmune encephalitis defined by antibodies against synaptic proteins and neuronal cell surface receptors.
Methods: Adult patients with a diagnosis of autoimmune encephalitis were included into a prospective registry. At 3, 6 and 12 months of follow-up, the patients' modified Rankin Scale (mRS) was obtained.
Results: Patients were stratified into three groups according to their antibody (Ab) status: anti-NMDAR-Ab (n=12; group I), anti-LGI1/CASPR2-Ab (n=35; group II), and other antibodies (n=24; group III). A comparably higher proportion of patients in group I received plasma exchange/immunoadsorption and second line immunosuppressive treatments at baseline. A higher proportion of patients in group II presented with seizures. Group III mainly included patients with anti-GABABR-, anti-GAD65- and anti-GlyR-Ab. At baseline, one third of them had cancer. Patients in groups I and III had much higher median mRS scores at 3 months compared to patients in group II. A median mRS of 1 was found at all follow-up time points in group II.
Conclusions: The different dynamics in the recovery of patients with certain autoimmune encephalitides have important implications for clinical trials. The high proportion of patients with significant disability at 3 months after diagnosis in groups I and III points to the need for improving treatment options. More distinct scores rather than the mRS are necessary to differentiate potential neurological improvements in patients with anti-LGI1-/CASPR2-encephalitis.
Keywords: anti-CASPR2-encephalitis; anti-LGI1-encephalitis; anti-NMDAR-encephalitis; autoimmune encephalitis; modified Rankin Scale.
Copyright © 2021 Seifert-Held, Eberhard, Lechner, Macher, Hegen, Moser, Jacob, Puttinger, Topakian, Guger, Kacar, Zoche, De Simoni, Seiser, Oberndorfer, Baumgartner, Struhal, Zimprich, Sellner, Deisenhammer, Enzinger, Reindl, Rauschka, Berger and Höftberger.