Comparison of Antithrombogenic Coated and Uncoated Flow Diverters in Ruptured and Unruptured Cerebral Aneurysms

Background And Purpose: Flow diversion has become a key treatment option for complex intracranial aneurysms. Recent advancements include coated flow diverters (FDs), designed to potentially reduce the need for dual antiplatelet therapy, thereby removing the associated secondary risks while maintaining patency and low complication rates. Comparing coated and uncoated FDs may offer insights into long-term outcomes and treatment optimization.

Method: In this retrospective single-center study, we investigated the data of 21 consecutive patients with cerebral aneurysms, treated between 2021 and 2023 with the coated Derivo 2heal Embolization Device and the uncoated Derivo Embolization Device (both Acandis). We described the procedure and analyzed clinical and radiological data, along with long-term outcomes after 18 months of follow-up.

Results: Nine patients (42.9%) had incidental, while 12 (57.1%) had symptomatic aneurysms, including 10 with World Federation of Neurosurgical Societies classification IV subarachnoid hemorrhages. Aneurysm locations included mostly the internal carotid (n = 9) and the vertebral artery (n = 7). All FDs were successfully deployed: 11 patients received the coated and 10 the uncoated device. After 18 months, 73.3% of patients had favorable outcomes (modified Rankin Score 0-2). One coated FD occluded asymptomatically after 6 months, and one uncoated FD occluded immediately but could be recanalized.

Conclusions: We observed favorable occlusion rates for both coated and uncoated FDs. The role of dual antiplatelet therapy remains debated. Large multicenter studies are essential to evaluate the patency of coated compared to uncoated FDs and determine whether they can reduce thrombogenicity, potentially allowing for less or no antiplatelet therapy in emergencies.