Abstract WP007: Impact of Residual Stenosis Severity on Clinical Outcome after Endovascular Therapy for Acute Large Vessel Occlusion

Introduction: The relationship between residual stenosis severity after endovascular therapy (EVT) and clinical outcomes in acute intracranial atherosclerosis-related large vessel occlusion (AT-LVO) remains unclear. Hypothesis: Severe residual stenosis is associated with worse clinical outcomes after EVT for acute intracranial AT-LVO. Methods: This post-hoc analysis of the RESCUE AT-LVO multicenter historical registry included 770 patients with AT-LVO treated with EVT between January 2017 and December 2019 in Japan. Patients with intracranial AT-LVO achieving sufficient recanalization (modified Thrombolysis in Cerebral Infarction [mTICI] ≥2a) were categorized into three groups based on their residual stenosis severity at final postprocedural angiography: mild (