Characteristics of patients, aneurysms, and treatments according to the initial angiographic follow-upa
| Characteristics | BOSS 1 (n = 20) | BOSS 0, 0′, 2, 3, and 3 + 1 (n = 200) | P Value |
|---|---|---|---|
| Patient | |||
| Age (mean) (yr) | 56.8 (SD, 10.9) | 55.7 (SD, 11.3) | .669 |
| Female | 14 (70) | 129 (65) | .623 |
| Current smoker | 3/18 (17) | 70/185 (38) | .074 |
| Aneurysm | |||
| Acutely ruptured | 4 (20) | 57 (29) | .418 |
| Irregular | 10 (50) | 97 (49) | .90 |
| Maximum diameter (mean) (mm) | 6.4 (SD, 1.8) | 6.4 (SD, 2.4) | .904 |
| Height (mean) (mm) | 4.8 (SD, 1.7) | 5.3 (SD, 2.2) | .211 |
| Neck (mean) (mm) | 4.4 (SD, 1.6) | 3.8 (SD, 1.2) | .113 |
| Width (mean) (mm) | 5.3 (SD, 1.5) | 5.0 (SD, 1.8) | .448 |
| Aspect ratio (height/neck) (mean) | 1.11 (SD, 0.44) | 1.38 (SD, 0.53) | .016 |
| Width/neck ratio (mean) | 1.23 (SD, 0.27) | 1.31 (SD, 0.30) | .220 |
| Location | |||
| MCA | 12 (60) | 89 (44.5) | Ref23 |
| AcomA | 3 (15) | 60 (30) | .137 |
| TCarotid | 3 (15) | 9 (4.5) | .218 |
| BA | 0 (0) | 17 (8.5) | .992 |
| Other | 2 (10) | 25 (12.5) | .512 |
| Treatment | |||
| Type of WEB | |||
| WEB-SL | 16 (80) | 152 (76) | Ref23 |
| WEB-DL | 1 (5) | 13 (7) | .770 |
| WEB-SLS | 3 (15) | 35 (18) | .754 |
| WEB 17 | 17 (85) | 126 (63) | .049 |
| Additional stent | 2 (10) | 8 (4) | .227 |
| Antiplatelet therapy (>1 week) | 15 (75) | 92 (46) | .013 |
| WShM (%) | 30 (9–36) | 39 (21–52) | .014 |
Note:—AcomA indicates anterior communicating artery; TCarotid, internal carotid artery terminus; BA, basilar artery; WEB-SL, WEB single-layer; WEB-DL, WEB dual-layer; WEB-SLS, WEB single-layer sphere; BOSS 0, no residual flow inside the aneurysm or the WEB; 0’, opacification of the proximal recess of the WEB; 1, residual flow inside the WEB; 2, neck remnant; 3, aneurysm remnant; 1 + 3, contrast agent media depicted inside and around the device.6
↵a Data are presented as number (%) for qualitative variables and as the mean (SD) or as the median (interquartile range) for quantitative variables (according to their distribution). Smoking status was missing for 17 patients.