RT Journal Article SR Electronic T1 Endovascular reperfusion of M2 occlusions in acute ischemic stroke reduced disability and mortality: ETIS Registry results JF Journal of NeuroInterventional Surgery JO J NeuroIntervent Surg FD BMJ Publishing Group Ltd. SP 444 OP 449 DO 10.1136/neurintsurg-2021-017380 VO 14 IS 5 A1 Patricio Muszynski A1 Mohammad Anadani A1 Sébastien Richard A1 Gaultier Marnat A1 Romain Bourcier A1 Igor Sibon A1 Cyril Dargazanli A1 Caroline Arquizan A1 Benjamin Maïer A1 Raphaël Blanc A1 Bertrand Lapergue A1 Arturo Consoli A1 Francois Eugene A1 Stephane Vannier A1 Laurent Spelle A1 Christian Denier A1 Marion Boulanger A1 Maxime Gauberti A1 Suzana Saleme A1 Francisco Macian A1 Frédéric Clarençon A1 Charlotte Rosso A1 Olivier Naggara A1 Guillaume Turc A1 Ozlem Ozkul-Wermester A1 Chrisanthi Papagiannaki A1 Alain Viguier A1 Christophe Cognard A1 Anthony Le Bras A1 Sarah Evain A1 Valérie Wolff A1 Raoul Pop A1 Serge Timsit A1 Jean-Christophe Gentric A1 Frédéric Bourdain A1 Louis Veunac A1 Benjamin Gory A1 Stephanos Nikolaos Finitsis A1 , YR 2022 UL http://jnis.bmj.com/content/14/5/444.abstract AB Background The predictors of successful reperfusion and the effect of reperfusion after endovascular treatment (EVT) for M2 occlusions have not been well studied. We aimed to identify predictors of successful reperfusion and the effect of reperfusion on outcomes of EVT for M2 occlusions in current practice.Methods Patients with acute ischemic stroke due to isolated M2 occlusions who were enrolled in the prospective multicenter Endovascular Treatment in Ischemic Stroke (ETIS) Registry in France between January 2015 and March 2020 were included. The primary outcome was a favorable outcome, defined as modified Rankin Scale (mRS) score of 0–2 at 90 days. Successful reperfusion was defined as an improvement of ≥1 points in the modified Thrombolysis In Cerebral Infarction score between the first and the last intracranial angiogram.Results A total of 458 patients were included (median National Institutes of Health Stroke Scale (NIHSS) score 14; 61.4% received prior intravenous thrombolysis). Compared with the non-reperfused patients, reperfused patients had an increased rate of excellent outcome (OR 2.3, 95% CI 0.98 to 5.36; p=0.053), favorable outcome (OR 2.79, 95% CI 1.31 to 5.93; p=0.007), and reduced 90-day mortality (OR 0.39, 95% CI 0.19 to 0.79; p<0.01). Admission NIHSS score was the only predictor of successful reperfusion. First-line strategy was not a predictor of successful reperfusion or favorable outcome, but the use of a stent retriever, alone or with an aspiration catheter, was associated with higher rates of procedural complications and 90-day mortality.Conclusions Successful reperfusion of M2 occlusions reduced disability and mortality. However, safety is a concern, especially if the procedure failed.All data relevant to the study are included in the article or uploaded as supplemental information. Endovascular Treatment in Ischemic Stroke (ETIS) Investigators.