How effective is the Mechanical Embolus Retrieval in Cerebral Ischemia (MERCI) Retrieval System for endovascular treatment of ischemic stroke?

Updated: May 27, 2020
  • Author: Edward C Jauch, MD, MS, FAHA, FACEP; Chief Editor: Helmi L Lutsep, MD  more...
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Successful recanalization occurred in 12 of 28 patients in the Mechanical Embolus Retrieval in Cerebral Ischemia (MERCI) 1 pilot trial, a study of the Merci Retrieval System. [108] In a second MERCI study, recanalization was achieved in 48% of patients in whom the device was deployed. Clot was successfully retrieved from all major cerebral arteries; however, the recanalization rate for the MCA was lowest. [109]

The Multi MERCI trial used the newer-generation Concentric retrieval device (L5). Recanalization was demonstrated in approximately 55% of patients who did not receive t-PA and in 68% of those to whom t-PA was given. Of patients who failed intravenous t-PA therapy, 73% had recanalization following mechanical embolectomy. [110] On the basis of these results, the FDA cleared the use of the MERCI device in patients who are either ineligible for or who have failed intravenous fibrinolytics.

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