Long-term mortality after endovascular thrombectomy for stroke

Objectives: Endovascular thrombectomy (EVT) has become the standard treatment for large vessel occlusion (LVO) in acute ischemic stroke. Stroke trials typically report clinical outcome at the three-month time point but there is a lack of studies focusing on the long-term outcome after EVT. The aim of this study is to assess the long-term mortality after EVT for stroke and to determine the factors that are associated with mortality.

Methods: Retrospective single-center analysis of 323 patients who underwent EVT for stroke between the years 2015-2019 and survived at least 30 days. Patients were followed up until the end of the year 2020. Cox regression analysis was used to identify the factors associated with mortality.

Results: A total of 53 (16.4%) of the 30-day survivors died during the follow-up. According to the Cox regression analysis, mortality was associated with functional dependence (modified Rankin Scale (mRS) >2, HR 2.7 (95% CI 1.2-5.9), p=0.013), comorbidity (Charlson Comorbidity Index (CCI) ≥3, HR 2.7 (95% CI 1.4-5.5), p=0.004), stroke severity at baseline (National Institutes of Health Stroke Scale (NIHSS) >8, HR 1.9 (95% CI 1.1-3.3), p=0.026), and medical complications (HR 2.4 (95% CI 1.2-4.8), p=0.011). Procedural variables did not have an impact on mortality.

Conclusions: Functional dependence, stroke severity, comorbidity, and medical complications during the hospital stay were associated with the long-term mortality after EVT for stroke.