Previous studies have shown that extreme delta brush and high beta/delta power ratio on electroencephalogram are suggestive of anti–N-methyl-d-aspartate receptor (anti-NMDAR) encephalitis. Here we report 3 anti-NMDAR encephalitis patients with ictal rhythmic alpha sinusoidal waves in temporal regions, which suggested electrographic seizures in anti-NMDAR encephalitis and indicated potential for seizure occurrence in the future. Rhythmic alpha sinusoidal waves may be an electrographic feature and helpful in distinguishing anti-NMDAR encephalitis. In addition, extreme delta brush was also observed at 47-50 days after morbidity in 2 of 3 patients.
GrausFTitulaerMJBaluRet al. A clinical approach to diagnosis of autoimmune encephalitis. Lancet Neurol. 2016;15:391-404.
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SchmittSEPargeonKFrechetteESHirschLJDalmauJFriedmanD.Extreme delta brush: a unique EEG pattern in adults with anti-NMDA receptor encephalitis. Neurology. 2012;79:1094-1100.
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FoffEPTaplingerDSuskiJLopesMBQuiggM.EEG findings may serve as a potential biomarker for anti-NMDA receptor encephalitis. Clin EEG Neurosci. 2017;48:48-53.
