Massey SL, Abenda NS, Gaynor JW, et al. - Researchers sought for the EEG changes that may assist in predicting impending cardiac arrest (CA) in neonates with congenital heart disease undergoing postoperative continuous EEG monitoring. In this single-center observational study, 22 neonates [median gestational age: 38.7 weeks (IQR 37.6, 39); the median age at surgery: 5 days (IQR 2, 8)] were assessed. Twelve patients (55%) underwent repair for hypoplastic left heart syndrome, and the median time from the cardiac intensive care unit arrival postoperatively to CA was 9.5 h (IQR 7, 23). In 68% of neonates, abnormal EEG background was evident at EEG monitoring onset and it worsened in all minutes before CA. Observations suggest EEG background changes as an early sign of impending CA and as indicative of developing cerebral dysfunction.