Abstract
Objective
The main syndrome of anti-N-methyl-d-aspartate receptor encephalitis (NMDARE) is well-characterized, however, the difference in main symptoms between the initial episode and relapses and patient-oriented long-term outcomes has not been previously described.
Methods
To investigate the difference in syndrome symptoms between episodes and patient-oriented outcomes, we administered a structured questionnaire survey for the patients with anti-NMDARE or their family members. From the answers, we analyzed the frequency of main symptoms (e.g., prodromes, abnormal behaviors, memory deficit, speech disorders, involuntary movements, hypo-ventilation) between episodes and patient-oriented outcomes that included the recovery rate for return to previous work or school.
Results
Fifty-six patients were enrolled, and 14 (25%) showed clinical relapse. Details of symptoms at relapse were obtained from 11 patients. Prodrome (27% vs. 96%, p < 0.001), decreased level of consciousness (55% vs. 88%, p = 0.021), seizures (36% vs. 77%, p = 0.012), and involuntary movements (27% vs. 84%, p < 0.001) were significantly less frequent at relapse than initial episode. Although 80% (35/44) of the patients achieved favorable long-term outcomes (modified Rankin Scale score, 0–2), only 61% (27/44) returned to their previous work or school life.
Conclusion
Anti-NMDARE can relapse with milder and more limited symptoms than those of initial episode, and some patients did not return to their previous activities even after achieving a neurologically favorable outcome.
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Acknowledgements
We sincerely thank all patients and their families. We also acknowledge the Japanese anti-NMDARE patients’ associations for providing the data from postal questionnaires sent to patients or patients’ families.
Funding
This work was supported in part by MHLW Grant Number 19HA1002 (Makoto Hara).
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Study concept and design: SH, MH, SK and HN. Drafting of the manuscript: SH. Acquisition of data: SH, SK and HN. Analysis and interpretation of data: all authors. Critical revision of the manuscript for important intellectual content: MH, JD and HN. Study supervision: MH, SK and HN. All authors approved the final version of this work.
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Josep Dalmau receives royalties from Athena Diagnostics for the use of Ma2 as an autoantibody test and from Euroimmun for the use of NMDA receptor, GABAB receptor, GABAA receptor, DPPX and IgLON5 as autoantibody tests. Satoshi Hirose, Makoto Hara, Satoshi Kamei and Hideto Nakajima report no disclosures relevant to the manuscript.
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This study was approved by the ethics committee of the Nihon University School of Medicine.
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Written informed consent for participation was obtained from the patients or their family members.
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Hirose, S., Hara, M., Kamei, S. et al. Characteristics of clinical relapses and patient-oriented long-term outcomes of patients with anti-N-methyl-d-aspartate receptor encephalitis. J Neurol 269, 2486–2492 (2022). https://doi.org/10.1007/s00415-021-10828-8
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DOI: https://doi.org/10.1007/s00415-021-10828-8