Table 1.
EEG Changes in First 24 Hours of Recording in Adults With Hypoxic-Ischemic Encephalopathy (N = 28) as Determined by Gold Standard (21-Channel) Review.
| First 8 Hours, n (%) | Second 8 Hours, n (%) | Third 8 Hours, n (%) | ||
|---|---|---|---|---|
| EEG background | Continuous | 0 | 0 | 0 |
| Near-continuous | 11 (40) | 13 (47) | 14 (50) | |
| Discontinuous | 3 (10) | 1 (3) | 0 | |
| Burst-suppression | 14 (50) | 14 (50) | 14 (50) | |
| Background amplitude | Very low (<10 μV) | 18 (65) | 15 (54) | 12 (43) |
| Low (10–20 μV) | 9 (32) | 12 (43) | 11 (40) | |
| Normal (>20 μV) | 1 (3) | 1 (3) | 5 (17) | |
| Maximum background frequency | Delta | 21 (76) | 12 (43) | 8 (29) |
| Theta | 3 (10) | 10 (36) | 7 (25) | |
| Alpha | 1 (4) | 2 (6) | 3 (11) | |
| Beta | 3 (10) | 4 (15) | 10 (35) | |
| Periodic epileptiform discharges | Present | 6 (22) | 9 (33) | 9 (33) |
| Sporadic discharges | Present | 5 (17) | 5 (17) | 7 (25) |
| Seizure | Present | 1 (4) | 0 | 0 |