Abstract 200: ICA Lesion Etiology does not affect the Outcomes after Endovascular Treatment of Acute Tandem LVO

Introduction Tandem lesions (TLs) are present in up to 15% of patients with stroke due to acute large vessel occlusions.(1) Nevertheless, published research on endovascular treatment outcomes in this population is scarce. Although TLs are most commonly of atherosclerotic etiology, some patients present with dissection of the ICA.(2, 3) In this study, we compared the clinical outcomes of TL patients with the two etiologies. Methods A retrospective analysis was performed on a multicenter cohort of patients with TLs who underwent endovascular treatment. The patients were categorized into two groups according to the etiology of the ICA lesion: atherosclerosis and dissection. Patients were matched by baseline characteristics. Clinical outcomes, including recanalization success, functional independence and hemorrhagic events were assessed with multivariable analyses. Results Of 691 patients from the database, 526 met the inclusion criteria of this study. 467 (88.8%) patients presented with atherosclerosis of the ICA, and 59 (11.2%) patients presented dissection. Univariable differences were found in median age (69 y. [IQR 61 ‐ 76] vs. 52 y. [IQR 44 ‐ 63], p