Demographics of groups based on EEG pattern and outcomea
| Malignant EEG (n = 0) | Malignant EEG (n = 9) | Nonmalignant EEG (n = 12) | Nonmalignant EEG (n = 12) | P Value | |
|---|---|---|---|---|---|
| Outcome | Good | Bad | Good | Bad | |
| Age (median) (IQR) | NA | 50 (42.5–59.5) | 53.5 (43.5–63.0) | 58.5 (43–66.0) | .252 |
| Female (No.) (%) | NA | 8 (89) | 4 (33) | 6 (50) | .051 |
| Arrest to MRI (median days) (IQR) | NA | 3 (2.5–5.0) | 5 (4.3–10.3) | 4 (3–4) | .065 |
| Length of stay (median days) (IQR) | NA | 9 (5–18) | 23 (13–27) | 13.5 (6–24.5) | .077 |
| GCS at time of MRI (median score) (IQR) | 4 (3–6) | 10b (8.5–14) | 6 (3.5–8) | .0014 | |
| Rhythm of arrest (No.) | |||||
| Asystole | NA | 2 | 3 | 3 | .71 |
| PEA | NA | 2 | 1 | 4 | |
| VF/VT | NA | 4 | 6 | 5 | |
| Unknown | NA | 1 | 2 | 0 | |
| Location of arrest (No.) | |||||
| In hospital | NA | 2 | 1 | 3 | .53 |
| Out of hospital | NA | 7 | 11 | 9 |
Note:—IQR indicates interquartile range; PEA, pulseless electrical activity; VF/VT, ventricular fibrillation/ventricular tachycardia; NA, not applicable; GCS, Glasgow Coma Scale.
↵a There were no individuals with malignant EEG and good outcome in this cohort. There were no significant differences by groupings using Kruskal-Wallis and Fisher exact tests for nonparametric analysis of continuous and categoric variables, respectively; sex and days from arrest to MRI were nearly significant with P = .051 and .065, respectively.
↵b P < .01 for comparison with the bad outcome groups; nonsignificant difference between the bad outcome groups.