Recently, mechanical thrombectomy with stent retriever has achieved faster and higher rates of recanalization for intracranial major vessel occlusion. However, comparative studies of the most widely used Solitaire and Trevo stents have been rarely published.The authors retrospectively reviewed a total of 200 patients who performed mechanical thrombectomy at our center during 4 years and divided patients into 2 groups: mechanical thrombectomy with Solitaire stent (Group 1: Solitaire) and mechanical thrombectomy with Trevo stent (Group 2: Trevo). All patients underwent a clinical assessment with National Institutes of Health Stroke Scale (NIHSS) score and underwent modified Rankin Scale (mRS) score. Radiologic results were evaluated using thrombolysis in cerebral infarction (TICI) score and number of stent passes. In addition, multiple time intervals were analyzed.There was no statistically significant difference in clinical outcome between the 2 groups. Trevo group revealed the shorter procedure time, less number of stent passage, and more one pass cases than Solitaire group with statistically significance (P = .009, P = .014, P = .030). In addition, Trevo group achieved higher successful recanalization (TICI 2b or 3) rate (89.7%) with statically significant than group1 (82.3%) (P = .018). In multivariate logistic regression analysis, the use of Trevo stent was a predictive for successful recanalization. (odds ratio 1.40, 95% confidence interval 1.250–1.550, P = .028).Our study suggests that the Trevo stent allows higher recanalization rate through the less number of stent passages and shorter procedure time than the Solitaire stent. More randomized control trials are needed to determine which stents are more effective.

Objective: We investigated whether intravenous thrombolysis (IVT) affected the outcomes and complications of mechanical thrombectomy (MT), specifically focusing on thrombus fragmentation. Methods: The patients who underwent MT for large artery occlusion (LAO) were classified into two groups: MT with prior IVT (MT+IVT) group and MT without prior IVT (MT-IVT) group. The clinical outcome, successful recanalization with other radiological outcomes, and complications were compared, between two groups. Subgroup analysis was also performed for patients with simultaneous application of stent retriever and aspiration. Results: There were no significant differences in clinical outcome and successful recanalization rate, between both groups. However, the ratio of pre- to peri-procedural thrombus fragmentation was significantly higher in the MT+IVT group (14.6% and 16.2%, respectively; P=0.004) compared to the MT-IVT group (5.1% and 6.8%, respectively; P=0.008). The MT+IVT group required more second stent retriever (16.2%), more stent passages (median value = 2), and more occurrence of distal emboli (3.9%) than the MT-IVT group (7.9%, median value = 1, and 8.1%, respectively) (P=0.004, 0.008 and 0.018, respectively). In subgroup analysis, the results were similar to those of the entire patients. Conclusion: Thrombus fragmentation of IVT with t-PA before MT resulted in an increased need for additional rescue therapies, and it could induce more distal emboli. The use of IVT prior to MT does not affect the clinical outcome and successful recanalization, compared with MT without prior IVT. Therefore, we need to reconsider the need for IVT before MT.

The low-profile Neuroform Atlas stent can be deployed directly without an exchange maneuver by navigating into the Gateway balloon. This retrospective study assessed the safety and efficacy of Neuroform Atlas stenting as a rescue treatment after failure of mechanical thrombetomy (MT) for large artery occlusion. Methods : Between June 2018 and December 2019, a total of 31 patients underwent Neuroform Atlas stenting with prior Gateway balloon angioplasty after failure of conventional MT caused by residual intracranial atherosclerotic stenosis (ICAS). Primary outcomes were successful recanalization and patency of the vessel 24 hours after intervention. Secondary outcomes were vessel patency after 14 days and 3-month modified Rankin Scale. Peri-procedural complications, intracerebral hemorrhage (ICH), and 3-month mortality were reviewed. Results : With a 100% of successful recanalization, median value of stenosis was reduced from 79.0% to 23.5%. Twenty-eight patients (90.3%) showed tolerable vessel patency after 14 days. New infarctions occurred in three patients (9.7%) over a period of 14 days; two patient (6.5%) underwent stent occlusion at 24 hours, and the other patient (3.2%) with delayed stent occlusion had a non-symptomatic dot infarct. There were no peri-procedural complications. Two patients (6.5%) developed an ICH immediately after the procedure with one of them is symptomatic. Conclusion : Neuroform Atlas stenting seems to be an effective and safe rescue treatment modality for failed MT with residual ICAS, by its high successful recanalization rate with tolerable patency, and low peri-procedural complication rate. Further multicenter and randomized controlled trials are needed to confirm our findings.