Abstract 10073: Characteristics of Very Late Stent Thrombosis Assessed by Coronary Angioscopy and Histopathology of Aspirated Thrombus

Background: The mechanisms of very late stent thrombosis (VLST) have not been fully elucidated and may involve multiple factors. The aim of this study was to evaluate characteristics of VLST based on angioscopy and histopathology of aspirated thrombus. Methods: Coronary angioscopy was performed in all stent thrombosis cases to evaluate the culprit lesion. The mechanisms of VLST were divided according to two factors by angioscopic findings such as uncovered struts and neoatherosclerosis. Uncovered struts were defined as stent struts uncovered by neointima. Neoatherosclerosis was defined as stent struts covered by yellow neointima. Furthermore, aspirated material was collected for assessment of atherothrombotic characteristics in all cases. Results: From February 2011 to April 2015, emergency PCI for acute myocardial infarction was performed in 336 patients, with 13 of these cases due to stent thrombosis. Clinical characteristics of VLST patients are shown in Figure. In uncovered struts, all 3 cases were no...