Continuous EEG Characteristics in Critically ill Patients Presenting With Seizures Prior to Death From Cardiac Arrest.

Background : There have been limited reports about brain activity during cardiac arrest. Here we report 4 patients presenting with seizure who had cardiac arrest leading to their deaths while being on continuous video-EEG (cVEEG) monitoring and one-lead cardiac telemetry. Purpose : We illustrate characteristic stepwise EEG and EKG changes in these critically ill patients prior to their death. Research Design/Study Sample : All patients showed progressive broad spectrum of cardiac arrhythmias at or before the beginning of EEG suppression while there were no such changes seen in a control group of 4 randomly selected patients without cardiac arrest who had seizure on presentation and underwent cVEEG monitoring. Data Collection and Results : There was a progressive decline in EEG potentials associated with decreasing heart rate starting from the posterior region, more pronounced on the left, progressing to complete unilateral deactivation of the left fronto-central head regions while the right-sided networks became hyperactive before bilateral deactivation by the time of asystole. Conclusions : This case series provides a rare opportunity to compare EEG and EKG changes in patients who died while being on continuous EEG and EKG monitoring from hours to minutes prior to cardiac arrest and death.