Clinical and angiographic outcomes, with treatment data, for patients with cerebral aneurysms treated with Guglielmi detachable coils: A single-center experience

OBJECTIVE: The purpose of this report is to provide the most detailed treatment and outcome data currently available in the literature, to allow for the further evaluation of Guglielmi detachable coils (GDC) as an appropriate treatment option for patients with cerebral aneurysms. METHODS: During a period of 4.5 years, 74 patients with intracerebral aneurysms were treated with GDC in the Department of Neurosurgery at Oregon Health Sciences University. A comprehensive retrospective and prospective analysis of these patients was performed, to assess the overall angiographic and clinical outcomes for these patients. RESULTS: Seventy-seven aneurysms were treated, with an average angiographic follow-up period of 1.4 years. Initially, 40% of aneurysms exhibited complete (100%) occlusion, 52% near complete (90-99%) occlusion, and 8% incomplete (<90%) occlusion. The average clinical follow-up period was 2.2 years. For unruptured aneurysms, 85% of patients returned to independent status. Of patients of Hunt and Hess Grade I/II status, 81% were independent; of patients of Grade III status, 100% were independent; and, of patients of Grade IV/V status, 50% were independent. The procedure-related morbidity rate was 9.1%, with a 7.8% risk of death from aneurysm perforation, stroke, or delayed hemorrhage. No completely occluded aneurysm hemorrhaged after GDC treatment (follow-up period, 1.9 yr). Of near complete occlusions, 2.6% hemorrhaged after embolization, at a rate of 1.4%/yr (follow-up period, 1.9 yr). CONCLUSION: This study details long-term clinical outcomes after GDC treatment and describes factors affecting the need for retreatment. Although complete anatomic cure was not obtained in all cases and the long-term protection from subarachnoid hemorrhage remains to be determined, these data indicate that GDC are a safe and efficacious treatment for cerebral aneurysms.