Introduction Emerging data suggests the safety and effectiveness of EVT for primary medium vessel occlusions (pMeVOs) like distal M2 and the M3 segments as well as the ACA and PCA, in part due to the improvement of stent-retriever (SR), aspiration catheters and endovascular techniques.

Aim of Study We assessed the efficacy and safety of the novel MIVI Q^TM aspiration catheters in combination with SR devices in the treatment of pMeVOs.

Methods We retrospectively analyzed demographics, procedure characteristics, and clinical data from consecutive patients with acute pMeVOs treated with a combined approach using MIVI Q^TM aspiration catheters and SR. Reperfusion was defined according to the Modified Thrombosis in Cerebral Infarction (mTICI) score. Clinical outcomes were measured by the National Institute of Health Stroke Scale (NIHSS) and modified Rankin Scale (mRS) scores.

Results We included 40 patients [median age, 74 y (IQR:62-80); 24 (60%) male; 34 (85%) with occlusion in the M2/M3 segment of the MCA, 5 (12.5%) in the PCA, and 1 (2.5%) in the ACA; median NIHSS score at admission was 12.5 (IQR:9.25-18)]. After the first pass, 19 (47.5%) patients had mTICI≥2c. At the end of the procedure, 39 (97.5%) had mTICI≥2b and 31 (77.5%) had mTICI≥2c. No serious device-related adverse events were observed. Symptomatic intracranial hemorrhage developed in 4 (10%) patients. At 90 days, 21 (52.5%) patients were functionally independent (mRS 0-2).

Conclusion This preliminary study found good efficacy and safety for MIVI Q^TM aspiration catheters used in combination with SR devices in the treatment of pMeVOs.

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Abstract O06 Figure 1

Mechanical Thrombectomy of a right M2/3occlusion treated with a Q3 and a low-profile stent retriever combined approach. After removing the microcatheter, the stent retriever is slightly retracted and the Q3 catheter carefully advanced to ensure better engagement of the thrombus.

Disclosure of Interest no.