Incidental Detection of Cardiac Arrhythmias during Routine Electroencephalography: Prevalence and Clinical Significance of Single-lead ECG Monitoring

Abs tractAim: Routine electroencephalography (EEG) recordings often include a single-lead electrocardiogram (ECG) channel, primarily to identify cardiac artifacts.However, incidental detection of cardiac arrhythmias during EEG may provide clinically relevant information.This study aimed to assess the prevalence and clinical relevance of arrhythmias detected during routine EEG.Methods: This retrospective, descriptive, observational study included outpatient EEG recordings that were performed between April 2023 and December 2024.Routine and sleep EEGs recorded with simultaneous single-lead ECGs were analyzed.Reports were screened using arrhythmia-related keywords.Clinical, electrophysiological, and follow-up data were reviewed, and patients were compared by age group (