Effect of thrombolysis type on the efficacy of aspiration versus stent retriever first line thrombectomy: results from the AcT trial

Background Intravenous (IV) tenecteplase is increasingly being used in lieu of alteplase for acute ischemic stroke. We sought to study the influence of IV tenecteplase versus IV alteplase on the efficacy of first line thrombectomy strategy.Methods This was a secondary analysis of the Alteplase versus Tenecteplase (AcT) trial. We included anterior and posterior circulation stroke patients in whom a thrombectomy was attempted. We compared outcomes for stent retriever as first line strategy versus contact aspiration alone, and interactions with thrombolysis type. We examined angiographic outcomes (extended final thrombolysis in cerebral infarction (eTICI) 2c-3 after first-pass, eTICI 2b-3 and eTICI 2 c-3 on final angiography), and clinical and safety outcomes. Mixed effect regression analyses with interaction terms were performed. All outcomes were assessed and analyzed by blinded adjudicators.Results Among 506 patients who received thrombectomy, 435 were included (222 (51.0%) IV tenecteplase, 213 (49.0%) IV alteplase). A stent retriever was used as the first line endovascular thrombectomy (EVT) approach in 288 (66.2%), and aspiration in 147 (33.8%) patients. There was no difference in rates of final eTICI 2c-3 between groups (57.0% with stent retriever vs 61.9% with aspiration; P=0.35). There was, however, a significant interaction (P=0.02) between thrombolysis type and first line EVT strategy for final eTICI 2c-3, where tenecteplase was associated with higher odds of final eTICI 2c-3 with aspiration (adjusted OR (aOR) 2.29, 95% CI 1.10 to 4.75), but not with stent retriever (aOR 0.63, 95% CI 0.38 to 1.04). No significant interaction between thrombolysis and first line strategy was found for the other angiographic, clinical or safety outcomes.Conclusion IV tenecteplase before EVT may enhance reperfusion with first line aspiration.Trial registration number NCT03889249.