Table 3.
Electroencephalogram (EEG) findings by duration of EEG and neurological outcomes
| Good Outcome (n=23) |
Poor Outcome (n=50) |
p value | |
|---|---|---|---|
| EEG duration (hours), median (IQR) | 25 (11,83) | 29 (1,66) | 0.71 |
| EEG background score: 1 hour, n (%) | n=23 EEGs | n=50 EEGs | < 0.001 |
| Score 0–1 (normal or slow/organized) | 17 (73.9) | 13 (26.0) | |
| 2 (slow and disorganized) | 6 (26.1) | 12 (24.0) | |
| 3 (discontinuous) | 0 | 2 (4.0) | |
| 4 (burst suppression) | 0 | 9 (18.0) | |
| 5 (suppression) | 0 | 14 (28.0) | |
| Normal voltage | 21 (91.3) | 23 (46.0) | < 0.001 |
| Reactive | 15 (65.2) | 12 (24.0) | 0.001 |
| Variable | 15 (65.2) | 12 (24.0) | 0.001 |
| Total number of patients with seizures in first hour, n (%) |
0 | 9 (18.0) | 0.05 |
| EEG background score: 24 hour | n=12 EEGs | n=28 EEGs | 0.36 |
| Score 0–1 | 7 (30.4) | 12 (42.8) | |
| 2 | 5 (21.7) | 8 (28.6) | |
| 3 | 0 | 0 | |
| 4 | 0 | 5 (17.9) | |
| 5 | 0 | 3 (10.7) | |
| Normal voltage | 10 (83.3) | 17 (60.7) | 0.27 |
| Reactive | 8 (66.7) | 13 (46.4) | 0.31 |
| Variable | 8 (66.7) | 13 (46.4) | 0.31 |
| Total number of patients with seizures in first 24 hours, n (%) |
1 (4.3) | 10 (20.0) | 0.16 |
| EEG backgroundscore: >24 hours | n=12 EEGs | n=28 EEGs | 0.63 |
| Score 0–1 | 8 (66.7) | 15 (53.6) | |
| 2 | 4 (33.3) | 9 (32.1) | |
| 3 | 0 | 2 (7.1) | |
| 4 | 0 | 7 (25.0) | |
| 5 | 0 | 5 (17.9) | |
| Normal voltage | 10 (83.3) | 22 (78.6) | 1.00 |
| Reactive | 10 (83.3) | 14 (50.0) | 0.08 |
| Variable | 10 (83.3) | 14 (50.0) | 0.08 |
| Total number of patients with seizures recorded after first day, n (%) |
2 (16.7) | 2 (7.1) | 0.57 |
| Total number of patients with seizures recorded at any time point |
2 (8.7) | 11 (22.0) | 0.21 |
| Myoclonic status epilepticus | 0 | 6 (12.0) | 0.17 |