Abstract WP222: Outcome Of ESUS With Possible Embolic Sources.

Background and Purpose: Our aim is to investigate the factors of outcome in ESUS with possible embolic source (PES) caused by non-high risk cardiac sources, malignancy, and mild atherosclerosis. Methods: Patients were selected from a comprehensive stroke center between April 2013 and April 2021. Inclusion criteria were: 1) consecutive ischemic stroke patients who fulfilled ESUS criteria based on NAVIGATE-ESUS trial, 2) who underwent TEE 3) who admitted our hospital within 7 days from stroke onset 4) pre stroke modified Rankin scale (mRS) score below 1 and 5) available mRS score at 3 months from stroke onset. PES included atrial cardiopathy (large left atrium diameter, slow out flow in left atrium appendage, and frequent premature atrium contraction), left ventricular dysfunction (history of heart failure, abnormal ventricular wall motion, and reduced ejection fraction), cardiac valve disease, right-to-left shunt, malignancy, and atherosclerosis (ipsilateral carotid plaque and aortic complicated lesion). We compared PES, between mRS score 0-1 (favorable outcome group) and mRS score 2-6 (unfavorable outcome group). Results: We screened 1,824 consecutive ischemic stroke patients, including 191 in ESUS patients. 159 (83%) patients were ESUS with PES. Of all, 33 patients had unfavorable outcomes (25 [76%] male, median age 64 years old, Figure A). Higher National Institute of Health Stroke Scale score on admission (OR 4.50, 95%CI 1.96-10.30, p <0.001) and higher frequency of atherosclerosis (OR 2.67, 95%CI 1.11-6.44, p =0.028) were independently associated with unfavorable outcome (Figure B). Conclusions: Atherothrombotic emboli may contribute to outcome of ESUS with PES.