Introduction: Endovascular treatment of cerebral aneurysms includes follow-up imaging to identify aneurysms that may need retreatment. The aim of this study was to determine predictors of incomplete aneurysm occlusion at 1 year after endovascular coiling for ruptured cerebral aneurysms.
Methods: In 129 patients of the Prospective Registry of Subarachnoid Aneurysms Treatment cohort, ruptured aneurysms were coiled within 14 days of onset and both initial post-coiling and 1-year follow-up digital subtraction angiography or magnetic resonance angiography were obtained. Factors predicting 1-year incomplete aneurysm occlusion (retreatment within 1-year or residual aneurysms at 1 year) were determined using multivariate logistic regression analyses.
Results: One-year incomplete aneurysm occlusion was identified in 59 patients, including ten patients who were retreated within 1-year post-coiling. Dome size ≥7.5 mm (P = 0.007, odds ratio (OR) = 5.00, 95% confidence interval (CI) = 1.55-16.15), pre-treatment aneurysm re-rupture (P = 0.023, OR = 3.50, 95% CI = 1.19-10.31), non-small size/small neck aneurysm (dome size, ≥10 mm or neck size, ≥4 mm; P = 0.022, OR = 3.26, 95% CI = 1.19-8.96), and residual aneurysms on immediate post-coiling angiograms (P = 0.017, OR = 1.43, 95% CI = 1.07-1.93) significantly predicted incomplete aneurysm occlusion at 1-year post-coiling.
Conclusions: In addition to the characteristics of aneurysm and initially incomplete aneurysm occlusion, this study showed pre-treatment aneurysm re-rupture to be a predictor that favors closer imaging follow-ups for coiled aneurysms.