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Recanalization Rates Decrease with Increasing Thrombectomy Attempts
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DOI：10.3174/ajnr.A1958.png)
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BACKGROUND AND PURPOSE. Use of the Merci retriever is increasing as a means to reopen large intracranial arterial occlusions We sought to determine whether there is an optimum number of retrieval attempts that yields the highest recanalization rates and after which the probability of success decreases MATERIALS AND METHODS: All consecutive patients undergoing Merci retrieval for large cerebral artery occlusions were prospectively tracked at a comprehensive stroke center We analyzed ICA, M1 segment of the MCA, and vertebrobasilar occlusions We compared the revascularization of the primary AOL with the number of documented retrieval attempts used to achieve that AOL score For tandem lesions, each target lesion was compared separately on the basis of where the device was deployed RESULTS We identified a total of 97 patients with 115 arterial occlusions The median number of attempts per target vessel was 3, while the median final AOL score was 2 Up to 3 retrieval attempts correlated with good revascularization (AOL 2 or 3) When >= 4 attempts were performed, the end result was more often failed revascularization (AOL 0 or 1) and procedural complications (P = 006) CONCLUSIONS. In our experience, 3 may be the optimum number of Merci retrieval attempts per target vessel occlusion Four or more attempts may not improve the chances of recanalization, while increasing the risk of complications
Keyword:
ACUTE ISCHEMIC-STROKE
MECHANICAL THROMBECTOMY
CEREBRAL-ISCHEMIA
MERCI TRIAL
THROMBOLYSIS
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