Effect of Heparinized Flush Concentration on Safety and Efficacy During Endovascular Thrombectomy for Acute Ischemic Stroke: Results from the MR CLEAN Registry

Faysal Benali*, Wouter H. Hinsenveld, MR CLEAN Registry Investigators, Christiaan van der Leij, Bob Roozenbeek, Rob A. van de Graaf, Julie Staals, Hester F. Lingsma, Aad van der Lugt, Charles B.M. Majoie, Wim H. van Zwam

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)


Background: Currently, there are no recommendations regarding the use of heparinized flush during endovascular thrombectomy (EVT) for acute ischemic stroke. Periprocedural heparin could, however, affect functional outcome and symptomatic intracranial hemorrhage (sICH). We surveyed protocols on heparin flush concentrations in Dutch EVT centers and assessed its effect on safety and efficacy outcomes. Methods: Patients registered in the MR CLEAN Registry, from 2014 up to 2017 were included. We collected data on center protocols regarding heparin flush concentrations (IU/L) and grouped patients by their per protocol administered heparin flush concentration. We used a random effects model with random intercepts by EVT center and analyzed endpoints using regression models. Endpoints were sICH, mRS at 90 days, mortality and reperfusion rates. Results: A total of 3157 patients were included of which 45% (6 centers) received no heparin in the flush fluids, 1.8% (1 center) received flush fluids containing 2000 IU/L heparin, 26% (4 centers) received 5000 IU/L, 22% (4 centers) received 10.000 IU/L and 5.6% (1 center) received 25.000 IU/L. Higher heparin concentration was associated with increased sICH (aOR 1.15; 95% CI 1.02–1.29), but not with functional outcome, mortality or reperfusion rates. Conclusion: Effect of heparin in flush fluids should not be ignored by clinicians or researchers as higher concentrations may be associated with higher rates of ICH. The observed variation in protocols regarding heparin concentrations between EVT centers should encourage further studies, ideally in a controlled way, resulting in recommendations on heparin use in flush fluids in future guidelines.

Original languageEnglish
Pages (from-to)750-755
Number of pages6
JournalCardioVascular and Interventional Radiology
Issue number5
Early online date3 Jan 2021
Publication statusPublished - May 2021

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© 2021, Springer Science+Business Media, LLC, part of Springer Nature and the Cardiovascular and Interventional Radiological Society of Europe (CIRSE).


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