Complications by aneurysm location and size subgroups
| Complications | Anterior ICA ≥10 mm (n = 275) | Anterior ICA <10 mm (n = 294) | Posterior (n = 55) | Other Anterior (n = 165) | Total (n = 793)a | 95% CI; P Value |
|---|---|---|---|---|---|---|
| Mean aneurysm size (mm) | 16.8 ± 6.2 | 5.2 ± 2.2 | 14.5 ± 9.0 | 9.8 ± 7.9 | 10.7 ± 7.7 | (10.2–11.2); <.001 |
| Spontaneous rupture | 4 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.6%) | 5 (0.6%) | (0.2%–1.5%); .17 |
| Intraparenchymal hemorrhage | 6 (2.2%) | 6 (2.0%) | 1 (1.8%) | 6 (3.6%) | 19 (2.4%) | (1.3%–3.4%); .73 |
| Ischemic stroke | 15 (5.5%) | 8 (2.7%) | 4 (7.3%) | 10 (6.1%) | 37 (4.7%) | (3.2%–6.2%); .16 |
| Parent artery stenosis | 1 (0.4%) | 1 (0.4%) | 0 (0.0%) | 0 (0.0%) | 2 (0.3%) | (0%–0.7%); 1.0 |
| Cranial neuropathy | 2 (0.7%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 2 (0.3%) | (0%–0.7%); .30 |
| Neurologic morbidity | 24 (8.7%) | 14 (4.5%) | 5 (9.1%) | 16 (9.7%) | 59 (7.4%) | (5.6%–9.2%); .16 |
| Neurologic mortality | 11 (4.0%) | 4 (1.4%) | 6 (10.9%) | 9 (5.5%) | 30 (3.8%) | (2.5%–5.1%); <.01 |
| Neurologic morbidity and mortality (all patients) | 26 (9.5%) | 14 (4.8%) | 9 (16.4%) | 18 (10.9%) | 67 (8.4%) | (6.5%–10.3%); .01 |
| Neurologic morbidity and mortality (patients with unruptured aneurysms) | 24/263 (9.2%) | 11/270 (4.1%) | 7/51 (13.7%) | 11/131 (8.4%) | 53/717 (7.4%) | (5.5%–9.3%); .03 |
| Neurologic morbidity and mortality (patients with ruptured aneurysms) | 2/12 (16.7%) | 3/24 (12.5%) | 2/4 (50.0%) | 7/34 (20.6%) | 14/76 (18.4%) | (10.0%–27.1%); .35 |
| Neurologic morbidity and mortality (excluding ruptured, dissecting, or fusiform aneurysms) | 15 (7.0%) | 9 (3.6%) | 3 (12.0%) | 6 (6.8%) | 33 (5.7%) | (4.1%–7.3%); .19 |
Note:—n indicates the number of patients.
↵a Numbers do not sum across categories and subcategories because some patients experienced >1 event.