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Efficacy and safety of different oral prednisone tapering courses in adult anti-NMDAR encephalitis: A multicenter prospective cohort study.

Epilepsia 2024 September 26
OBJECTIVE: In adult anti-N-methyl-d-aspartate receptor (NMDAR) encephalitis, corticosteroids are commonly used as first-line treatment. However, the optimal oral prednisone tapering (OPT) following intravenous methylprednisolone pulse therapy remains unclear. We aim to compare the efficacy and safety of different OPT courses in anti-NMDAR encephalitis.

METHODS: The CHASE study, a multicenter prospective observational cohort study, enrolled patients with autoimmune encephalitis from October 2011 to March 2023. Patients were grouped based on oral prednisone tapering course: ≤3 months (Group ≤3 month), 3-6 months (Group 3-6 months, including 3 months), and >6 months (Group > 6 months). Kaplan-Meier plots were used to analyze time to relapse and time to total recovery within 2 years.

RESULTS: Among 666 screened patients, 171 (median [IQR] age 27 [21.0-36.5] years, 55.0% female) met selection criteria. Responders at 3 months were prevalent in Group ≤3 months (OR 7.251 [95% CI 2.252 to 23.344] and Group 3-6 months (OR, 3.857 [95% CI 1.107 to 13.440] than in Group >6 months. Clinical Assessment Scale for Autoimmune Encephalitis (CASE) scores at 12 months were higher in Group >6 months than in Group ≤3 months and Group 3-6 months (β, -2.329 [95% CI -3.784 to -.875]; β, -2.871 [95% CI -4.490, -1.253]). CASE seizures subscore was higher in Group >6 months than in Group 3-6 months (β, -.452 [95% CI -.788 to -.116]). No significant difference in seizure freedom rates among the groups. Adverse events were higher in Group 3-6 months and Group >6 months than in Group ≤3 months (OR 6.045 [95% CI 2.352 to 15.538]; OR 6.782 [95% CI 1.911 to 24.073]).

SIGNIFICANCE: Longer oral prednisone courses for adult patients with anti-NMDAR encephalitis did not show superior effects compared to shorter courses in improving modified Rankin Scale (mRS) scores and CASE scores, reducing the risk of relapse within 2 years, or achieving seizure freedom. Instead, extended prednisone courses may lead to more side effects- particularly weight gain. This outcome recommends evaluating the possibility of shortening the duration of oral prednisone after a thorough patient assessment.

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