Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology · 2026
The typical and atypical spectrum of subclinical rhythmic EEG discharges in adults and its electrical origin.
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Rajeevan Srinath, Narayanan Sreelakshmi, Pendyala Santhosh Kumar, Baburaj Hridhya, Ravindran Sonu, Raman Akshaya, Gopinath Siby
Аннотация
INTRODUCTION: Subclinical rhythmic EEG discharges in adults (SREDA) is a very rare benign EEG pattern. We aimed to localize the electrical origin of SREDA using electrical source imaging (ESI), identify the mechanism responsible for SREDA and describe its characteristics.
METHODS: An electronic term search for SREDA was performed on all video EEG reports between January 2020-June 2024. Both typical and atypical SREDA patterns were included. The clinical details, EEG, and neuroimaging findings were noted. ESI was performed using classical LORETA analysis recursively (CLARA).
RESULTS: On reviewing 10,574 EEG recordings, 13 subjects (0.1 %) with SREDA were identified. Six patients had typical patterns and seven had atypical patterns. The posterior cingulate and/or the lingual gyrus were found to be the most common electrical origin for typical SREDA. Additionally, ESI source localized to the hippocampus/anterior cingulate in atypical SREDA. One patient with obstructive sleep apnea (OSA) had SREDA correlating with the period of apnea/hypopnea during polysomnography.
CONCLUSION: The posterior cingulate/lingual gyrus were found to be the most common electrical sources using ESI. The possible association between hypoxia and SREDA may warrant further study.
SIGNIFICANCE: Our paper electrically source localises SREDA, a field in which there is a paucity of literature. The occurrence of SREDA with apnea/hypopnea in a patient with OSA is a novel finding.
METHODS: An electronic term search for SREDA was performed on all video EEG reports between January 2020-June 2024. Both typical and atypical SREDA patterns were included. The clinical details, EEG, and neuroimaging findings were noted. ESI was performed using classical LORETA analysis recursively (CLARA).
RESULTS: On reviewing 10,574 EEG recordings, 13 subjects (0.1 %) with SREDA were identified. Six patients had typical patterns and seven had atypical patterns. The posterior cingulate and/or the lingual gyrus were found to be the most common electrical origin for typical SREDA. Additionally, ESI source localized to the hippocampus/anterior cingulate in atypical SREDA. One patient with obstructive sleep apnea (OSA) had SREDA correlating with the period of apnea/hypopnea during polysomnography.
CONCLUSION: The posterior cingulate/lingual gyrus were found to be the most common electrical sources using ESI. The possible association between hypoxia and SREDA may warrant further study.
SIGNIFICANCE: Our paper electrically source localises SREDA, a field in which there is a paucity of literature. The occurrence of SREDA with apnea/hypopnea in a patient with OSA is a novel finding.