Table 2.

Electroencephalogram (EEG) findings during first hour of EEG monitoring and neurological outcomes

	Good Outcome (n=23)	Poor Outcome (n=50)	p value
Interval between ROSC and EEG initiation ≤ 12 hr	n=10 EEGs	n=33 EEGs
EEG background score, n (%)			0.008
Score 0–1 (normal or slow and organized)	8 (80.0)	7 (21.2)
2 (slow and disorganized)	2 (20.0)	6 (18.2)
3 (discontinuous)	0	2 (6.1)
4 (burst suppression)	0	8 (24.2)
5 (suppression)	0	10 (30.3)
Normal voltage	10 (100)	12 (36.4)	0.001
Reactive	6 (60.0)	6 (18.2)	0.017
Variable	6 (60.0)	6 (18.2)	0.017
Seizures, n (%)	n=0 seizures	n=7 seizures	0.13
Low seizure burden	0	1 (14.3)
Moderate seizure burden	0	1 (14.3)
Status epilepticus	0	5 (71.4)
Interval between ROSC and EEG initiation > 12 ≤ 24 hr	n=8 EEGs	n=11 EEGs
EEG background score, n (%)			0.13
Score 0–1 (normal or slow and organized)	4 (50.0)	3 (27.3)
2 (slow and disorganized)	4 (50.0)	4 (36.4)
3 (discontinuous)	0	0
4 (burst suppression)	0	1 (9.1)
5 (suppression)	0	3 (27.3)
Normal voltage	6 (75.0)	7 (63.6)	1.00
Reactive	5 (62.5)	3 (27.3)	0.18
Variable	5 (62.5)	3 (27.3)	0.18
Seizures, n (%)	n=0 seizures	n=1 seizure	0.58
Low seizure burden	0	0
Moderate seizure burden	0	0
Status epilepticus	0	1 (9.1)
Interval between ROSC and EEG initiation > 24 hr	n=5 EEGs	n=6 EEGs
EEG background, n (%)			0.26
Score 0–1 (normal or slow and organized)	5 (100)	3 (50.0)
2 (slow and disorganized)	0	2 (33.3)
3 (discontinuous)	0	0
4 (burst suppression)	0	0
5 (suppression)	0	1 (16.7)
Normal voltage	5 (100)	4 (66.7)	0.46
Reactive	4 (80.0)	3 (50.0)	0.55
Variable	4 (80.0)	3 (50.0)	0.55
Seizures, n (%)	n=0 seizures	n=1 seizure	0.55
Low seizure burden	0	0
Moderate seizure burden	0	1 (16.7)
Status epilepticus	0	0

Low seizure burden = seizures occurring less than 12 minutes per hour; moderate seizure burden = seizures occurring between 12 and 29 minutes per hour; status epilepticus = greater than 30 minutes of seizure per hour