The patients had been diagnosed with several neurologic diseases, including cerebrovascular disease, epilepsy, psychogenic nonepileptic seizures, mental retardation, Alzheimer disease, and transient global amnesia. The mean age of patients was 52.1 ± 17.7 (range, 21-71) years. Subclinical rhythmic EEG discharges in adults was present in 14 EEG records (0.06%), in nine patients. The demographic, clinical characteristics, and neuroimaging features of the patients were reviewed. The EEGs with SREDA were reevaluated blindly by three clinical neurophysiologists. We reviewed 22,234 EEG reports that are reported by the same experienced clinical neurophysiologists, between 20. Herein, we aimed to report patients with SREDA to identify the frequency and characterized clinical, demographic, electrophysiological features. It resembles ictal discharges, and overinterpretation of SREDA may lead to misdiagnosis of epilepsy. The electrophysiological features and atypical variants of SREDA has wide spectrum and they are poorly known. Subclinical rhythmic EEG discharges in adults (SREDA) is a very rare benign EEG pattern.
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