Progressive slowing of clonic phase predicts postictal generalized EEG suppression

Objective Postictal generalized electroencephalography (EEG) suppression (PGES) is a surrogate marker of sudden unexpected death in epilepsy (SUDEP). It is still unclear which ictal phenomena lead to prolonged PGES and increased risk of SUDEP. Semiology features of generalized convulsive seizure (GCS type 1) have been reported as a predictor of prolonged PGES. Progressive slowing of clonic phase (PSCP) has been observed in GCSs, with gradually increasing inhibitory periods interrupting the tonic contractions. We hypothesized that PSCP is associated with prolonged PGES. Methods We analyzed 90 bilateral convulsive seizures in 50 consecutive patients (21 female; age: 11–62 years, median: 31 years) recruited to video‐EEG monitoring. Five raters, blinded to all other data, independently assessed the presence of PSCP. PGES and seizure semiology were evaluated independently. We determined inter‐rater agreement (IRA) for the presence of PSCP, and we evaluated its association, as well as that of other ictal features, with the occurrence of PGES, prolonged PGES (≥20 s) and very prolonged PGES (≥50 s) using multivariate logistic regression analysis. Results We found substantial IRA for the presence of PSCP (percent agreement: 80%; beyond‐chance agreement coefficient: .655). PSCP was an independent predictor of the occurrence of PGES and prolonged PGES (p