Table 2.
Neurophysiologic and MRI findings of study subjects
| All | No Seizure | EEG Seizure | Clinical Seizure | p-value | |
|---|---|---|---|---|---|
| 1658 | 947 | 472 | 239 | ||
| aEEG at 24 h♯ (n,%) | 494 (29.8) | 259 (27.4) | 141 (29.9) | 94 (39.3) | 0.001* |
| Normal | 82 (16.6) | 69 (26.6) | 6 (4.3) | 7 (7.5) | <0.001* |
| Moderately abnormal | 223(45.1) | 119 (46.0) | 76 (53.9) | 28 (29.8) | |
| Severely abnormal | 86 (17.4) | 25 (9.7) | 37 (26.2) | 24 (25.5) | |
| Unknown | 103(20.9) | 46 (17.8) | 22 (15.6) | 35 (37.2) | |
| cEEG within 24 h♯ (n,%) | 1131(68.2) | 707 (74.7) | 310 (65.7) | 238 (99.6) | <0.001 |
| Short | 135 (11.9) | 79 (11.2) | 28 (9.0) | 28 (24.6) | <0.001 |
| Continuous | 95 (8.4) | 54 (7.6) | 24 (7.7) | 17 (14.9) | |
| Video | 901 (79.7) | 574 (81.2) | 258 (83.2) | 69 (60.53) | |
| Diagnosis type | |||||
| Normal | 172 (15.2) | 148 (20.9) | 15 (4.8) | 9 (7.9) | <0.001* |
| Abnormal | 959 (84.8) | 559 (79.1) | 295 (95.2) | 105 (92.1) | |
| Background | |||||
| Burst suppression | 123 (10.9) | 27 (3.8) | 82 (26.5) | 14 (12.3) | <0.001* |
| Continuous (Normal) | 233 (20.6) | 195 (27.6) | 21 (6.8) | 17 (14.9) | |
| Discontinuous | 620 (54.8) | 410 (58.0) | 157 (50.7) | 53 (46.5) | |
| Isoelectric / Flat | 103 (9.1) | 44 (6.2) | 34 (11.0) | 25 (21.9) | |
| Stated unknown | 52 (4.6) | 31 (4.4) | 16 (5.2) | 5 (4.4) | |
| MRI findings+ (n,%) | 1450 | 831 | 415 | 204 | |
| Hemorrhage | 303 (20.9) | 166 (20.0) | 103 (24.8) | 34 (16.7) | 0.039* |
| Stroke | 107 (7.4) | 46 (5.5) | 45 (10.8) | 16 (7.8) | 0.003* |
| White matter injury | 236 (16.3) | 98 (11.8) | 98 (23.6) | 40 (19.6) | <0.001* |
| Deep grey matter injury | 284 (19.6) | 84 (10.1) | 147 (35.4) | 53 (26.0) | <0.001* |
| Cortical injury | 183 (12.6) | 41 (4.4) | 115 (27.7) | 27 (13.2) | <0.001* |
| Normal | 524 (36.1) | 400 (48.1) | 72 (17.4) | 52 (25.5) | <0.001* |
Abbreviations: EEG electroencephalographic, MRI magnetic resonance imaging
♯Based on patients for whom aEEG or cEEG data were available; some patients received both aEEG and full EEG (cEEG); aEEG was not consistently displayed on full EEG; aEEG reflects cerebral function monitor output
+Based on patients for whom MRI findings were available
*p-value <=0.05