Association of Endothelial Activation and Stress Index with Prognosis in Posterior Circulation Infarcts Treated with Recanalization Therapy

<b>Background</b>: Endothelial dysfunction plays a critical role in ischemic stroke. The Endothelial Activation and Stress Index (EASIX), calculated from creatinine, lactate dehydrogenase (LDH), and platelet levels, reflects endothelial injury. This study aimed to investigate the relationship between EASIX and 90-day mortality in patients with posterior circulation ischemic stroke (PCIS) treated with mechanical thrombectomy. <b>Methods</b>: Fifty-eight patients with acute ischemic stroke who underwent mechanical thrombectomy (MT) or MT combined with intravenous thrombolysis (intravenous tissue plasminogen activator (tPA)) for posterior circulation ischemic stroke (PCIS) were included. EASIX was calculated using 24 h laboratory values of creatinine, LDH, and platelets. Its association with 90-day mortality, length of hospital stay, intubation, and parenchymal hemorrhage was analyzed. <b>Results</b>: In patients receiving reperfusion therapy, the Endothelial Activation and Stress Index (EASIX) showed modest ability to predict 90-day mortality (AUC = 0.583, 95% CI 0.428-0.739, <i>p</i> = 0.295). Higher EASIX values were linked to a 6.58-fold increase in mortality risk. Patients with elevated EASIX were generally older, had more frequent hyperlipidemia, had higher 24 h National Institutes of Health Stroke Scale (NIHSS) scores, had greater need for intubation, and had higher in-hospital mortality. <b>Conclusions</b>: EASIX is a simple, inexpensive, and non-invasive marker that may reflect endothelial dysfunction and help predict mortality in PCIS patients undergoing reperfusion therapy. Higher EASIX values are associated with poorer prognosis. Early identification of high-risk patients may support secondary prevention strategies.