Elucidating stroke etiology through lipidomics of thrombi and plasma in acute ischemic stroke patients undergoing endovascular thrombectomy.

Acute ischemic stroke (AIS) requires detailed etiology information to guide optimal management. Given the pivotal role of lipids in AIS, we conducted a comprehensive lipidomics analysis of paired thrombi and plasma from AIS patients, correlating the findings with stroke etiology. Patients were recruited across four etiologies: cardioembolism (CE), large artery atherosclerosis (LAA), active cancer (Cancer), and undetermined. Plasma and thrombi were collected before and during endovascular thrombectomy and analyzed using in-house targeted lipidomics. Among 51 patients (37 CE, 7 LAA, 4 Cancer, and 3 undetermined), we identified 37 and 70 lipid species significantly different between thrombi in CE and LAA, and CE and Cancer, respectively (FDR-corrected 0.05). No significant differences were observed in plasma. Notably, 21 diacylglycerols and 11 polyunsaturated triacylglycerols were depleted (2.5 to 12 folds) in LAA compared to CE, while 10 ceramides and 57 glycerophospholipids were elevated in Cancer. With 80% validation accuracy, 29 and 59 lipids distinguished LAA and Cancer from CE, respectively. A neural network model using these lipids effectively classified undetermined patients. This study emphasizes the significance of thrombus lipids in distinguishing between LAA, CE, and Cancer etiologies in AIS, enhancing our understanding of stroke pathophysiology and informing future clinical managements.