RT Journal Article SR Electronic T1 Mechanisms of fibrinolysis resistance and potential targets for thrombolysis in acute ischaemic stroke: lessons from retrieved stroke emboli JF Stroke and Vascular Neurology JO Stroke Vasc Neurol FD BMJ Publishing Group Ltd SP svn-2021-001032 DO 10.1136/svn-2021-001032 A1 Brinjikji, Waleed A1 Madalina Mereuta, Oana A1 Dai, Daying A1 Kallmes, David F A1 Savastano, Luis A1 Liu, Yang A1 Nimjee, Shahid M A1 Nogueira, Raul G A1 Abbasi, Mehdi A1 Kadirvel, Ramanathan YR 2021 UL http://svn.bmj.com/content/early/2021/07/25/svn-2021-001032.abstract AB There has been growing interest and insight into the histological composition of retrieved stroke emboli. One of the main focuses of the stroke clot analysis literature has been the implications of clot composition on mechanical thrombectomy procedures. However, the holy grail of clot analysis may not be in the field of clot–device interaction, but rather, in understanding mechanisms of fibrinolysis resistance. The mechanisms underlying the low response to fibrinolytic therapy, even with the newer, more powerful agents, remain poorly understood. While factors such as embolus size, location and collateral status influence alteplase delivery and recanalisation rates; compositional analyses focused on histological and ultrastructural characteristics offer unique insights into mechanisms of alteplase resistance. In this review, we strive to provide comprehensive review of current knowledge on clot composition and ultrastructural analyses that help explain resistance to fibrinolysis.