Abstract DP227: Age Modifies the Prognostic Utility of Posterior Circulation ASPECTS in Vertebrobasilar Occlusion after Endovascular Therapy

Background: Endovascular thrombectomy (EVT) is the established therapy for vertebrobasilar occlusion (VBO). However, predictors of outcome remain heterogeneous, and the prognostic utility of posterior circulation ASPECTS (pc-ASPECTS), particularly in elderly patients, is not well defined. We sought to evaluate the interaction between pc-ASPECTS and age on clinical outcomes after EVT for VBO in a 10-year multicenter cohort. Methods: We retrospectively included patients with VBO treated with EVT from a prospectively maintained registry across three comprehensive stroke centers between 2014 and 2024. Patients were stratified by pc-ASPECTS (≤8 vs. >8) and by age (