| Imaging utilization | Total cohort (n = 207) | Positive outcome (n = 186) | Poor outcome (n = 21) | P |
| Repeat imaging in 1st 24 hours | 195 (94.2) | 174 (93.5) | 21 (100) | 0.230 |
| Repeat imaging type |
|
|
|
|
| None | 12 (5.8) | 12 (6.5) | 0 | 0.303 |
| CT | 174 (84.1) | 156 (83.9) | 18 (85.7) |
|
| MRI | 6 (2.9) | 6 (3.2) | 0 |
|
| Both | 15 (7.2) | 12 (6.5) | 3 (14.3) |
|
| Indication for repeat CT |
|
|
|
|
| Routine repeat | 176 (85.0) | 159 (94.6) | 17 (81) | 0.019 |
| Pre-op check | 3 (1.4) | 3 (1.8) | 0 | 0.537 |
| Post-op check | 2 (1.0) | 1 (0.6) | 1 (4.8) | 0.079 |
| Cognitive decline/AMS | 6 (2.9) | 4 (2.4) | 2 (9.5) | 0.078 |
| Post-seizure | 2 (1.0) | 1 (0.6) | 1 (4.8) | 0.079 |
| Time to repeat head CT (days)‡ | 1.0 (1.0) | 1.0 (1.0) | 1.0 (1.0 - 2.0) | 0.549 |
| Range of days to follow up CT | 0 - 13 | 0 - 5 | 0 - 3 |
|
| # of follow up CT head scans‡ | 1 (1 - 2) | 1 (1 - 2) | 2 (1 - 5) | <0.001 |