Imaging data for patients with symptoms of ischemic stroke*
| Imaging metric | No. (%) of patients† |
|---|---|
| ASPECTS | n = 53 |
| Mean score ± SD | 8.89 ± 1.86 |
| Range | 1–10 |
| Multiphasic CT angiography | n = 71 |
| Completed upon presentation | 51 (72) |
| Completed > 12 h after presentation | 6 (8) |
| Not completed | 14 (20) |
| Site/type of occlusion | n = 51 |
| Carotid T | 1 (2) |
| Carotid L | 1 (2) |
| M1–MCA | 9 (18) |
| M1–MCA equivalent (≥ 2 M2–MCAs) | 2 (4) |
| Basilar artery (basilar tip) | 1 (2) |
| No proximal-vessel occlusion | 37 (72) |
| Quality of collateral circulation‡ | n = 14 |
| Good | 12 (86) |
| Intermediate | 2 (14) |
| Poor | 0 (0) |
| Vascular access‡ | n = 14 |
| Suitable/feasible | 12 (86) |
| Unsuitable | 2 (14) |
Note: ASPECTS = Alberta Stroke Programme Early CT Score, CT = computed tomography, M1–MCA = M1 segment of middle cerebral artery, M2–MCA = M2 segment of middle cerebral artery, SD = standard deviation.
↵* All patients presented within 24 h of symptom onset, and all were assessed by a stroke on-call physician. Radiographs were assessed by a staff radiologist at Health Sciences North if both unenhanced CT of the head and multiphasic CT angiography of the head and neck were completed within 12 h of presentation to the emergency department.
↵† Except where indicated otherwise.
↵‡ Quality of collateral circulation and feasibility of vascular access were not determined for patients with no proximal-vessel occlusion identified on CT angiography.