Abnormal repolarization: A common electrocardiographic finding in patients with epilepsy

Abstract

Background: Recently, certain forms of early repolarization (ER) on electrocardiograms (ECGs) have been considered a possible marker of increased sudden cardiac death risk. The frequency, characteristics, and clinical follow-up with which these forms of ER are present in epilepsy patients, and whether or not abnormal ER contributes to sudden unexplained death in epilepsy patients (SUDEP) is unknown. Methods and Results: The amplitude of J peak and ST-segment morphology after ER on 12-lead ECGs were assessed in 354 epilepsy patients (age, 33 ± 16 years; 54% men) and 140 age- and sex-matched control subjects (age, 31 ± 12 years; 50% men). Abnormal ER prevalence (J-wave amplitude ≥0.1 mV) was greater in epilepsy patients (19.8%) compared with controls (8.6%; P = 0.002) in inferior ECG leads but not in lateral leads (P = 0.40). ER with a horizontal or descending ST segment was also more prevalent in epilepsy patients (P < 0.001). After introducing antiepileptic drugs in 36 epilepsy patients, there were no significant ER changes. Similarly, in 64 epilepsy patients with seizure suppression, ER comparison before and after seizure control revealed no significant changes. Male gender was the only significant predictor of abnormal ER in epilepsy patients (P = 0.03). During a median follow-up of 7 years, SUDEP occurred in two patients, one with abnormal ER. Conclusions: Abnormal ER may be more prevalent in epilepsy patients than in controls and is not altered by antiepileptic drugs or achievement of epilepsy suppression. The relation of abnormal ER to SUDEP remains in need of further study.