• Ondra Petr, Lucie Petrová, Ondřej Bradáč, Bernhard Glodny, Michael Edlinger, and Claudius Thomé.
• Department of Neurosurgery, Medical University Innsbruck, Innsbruck, Austria; Department of Neurosurgery, Resuscitation and Intensive Care of 1(st) Faculty of Medicine, Charles University in Prague, Military University Hospital Střešovice, Prague, Czech Republic. Electronic address: ondra.petr@yahoo.com.
• World Neurosurg. 2018 Jun 1; 114: e137-e150.

Background/ObjectiveThe safety and efficacy of endovascular treatment of previously clipped aneurysms have not been well-established. We conducted a systematic review of the literature to evaluate the outcomes of endovascular treatment of previously clipped aneurysms.MethodsA systematic search of MEDLINE, Embase, Scopus, and the Web of Science was performed for studies published until October 2017. We included studies with ≥2 patients that described endovascular treatment of previously clipped aneurysms. A random-effects meta-analysis was used to pool the following outcomes: technical success, aneurysm occlusion/recurrence/rebleed, ischemic/thrombotic/thromboembolic events, neurologic/procedure-related morbidity/mortality, and favorable neurologic outcomes. We performed subgroup analyses by aneurysm rupture status on presentation to the endovascular procedure, treatment timing, and by aneurysm location (anterior vs. posterior circulation).ResultsIn total, 27 studies with 271 patients were included. Overall complete occlusion was 76.1% (95% confidence interval [CI] 0.676-0.836) and technical success was 97.9% (95% CI 0.958-0.993). Combined procedure-related morbidity/mortality was 4.5% (95% CI 0.024-0.073). There were no statistically significant differences in any of the safety and efficacy outcomes by aneurysm location. Overall long-term favorable neurologic outcome was 78.5% (95% CI 0.732-0.834). All included studies are retrospective.ConclusionsOur meta-analysis demonstrated that endovascular treatment is acceptably safe and effective. It is important to point out that the complication rate of treatment of these aneurysms is not negligible. These findings should be considered when deciding the best therapeutic strategy. Our findings may suggest that endovascular treatment of previously clipped aneurysms should only be considered in circumstances in which conservative management seems to be unsafe.Copyright © 2018 Elsevier Inc. All rights reserved.

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