Keywords: AF, atrial fibrillation; Atrial fibrillation; Cardiac arrhythmia; Epilepsy; GTCS, generalized tonic–clonic seizure; PGES, post-ictal generalized electroencephalographic suppression; PIAF, post-ictal atrial fibrillation; Phelan–McDermid syndrome; SHANK3 gene; SUDEP; SUDEP, sudden unexpected death in epilepsy; VEM, video-EEG monitoring.