Study Protocol DEDICATE: Italian Multicenter Study on the Treatment of Visceral Aneurysms with the Derivo Peripher and Derivo 2 Flow Diverter Stent.

Abstract

Purpose: This study aims to evaluate the safety and efficacy of the Derivo peripher and Derivo 2 Embolization Device Flow Diverter Stents (DEDs, Acandis GmbH) in treating visceral aneurysms.

Materials and methods: This multicentric registry with core-lab evaluation involves 29 Italian Interventional Radiology and Vascular Surgery units, targeting 100 patients. Inclusion criteria include visceral artery aneurysms without signs of rupture and adherence to correct DED stent sizing and anticoagulant and antiplatelet protocols. Patients will undergo physical examination and computed tomography angiography (CTA) within 6-month and at 1-year post-procedure. A core laboratory will evaluate all pre- and post-procedure CTA and procedural angiographic images for procedural correctness (adherence to correct DED sizing, deployment accuracy, and technical issues), stent morphology during follow-up (patency and geometrical changes), and VAA morphological changes (volume variation, thrombosis grade, and number of patent branches). The primary objective is to evaluate the technical efficacy and safety of DEDs at 1-year follow-up. Efficacy will be assessed by patency of DEDs and side branches, aneurysm thrombosis (< 50%, > 50% or total volume of the aneurysm), and non-increase in aneurysm volume (percentage change relative to initial volume). Safety will be assessed by morbidity (adverse events during follow-up), mortality (any cause of death), and technical issues (adverse events during stent placement, based on CIRSE classification of complications).

Expected gain of knowledge: The DEDICATE registry will provide further information on the effectiveness of flow-diverting stents in treating visceral aneurysmal pathology. Trial Registration ClinicalTrials.gov identifier: NCT06325371.