Workflow and factors associated with delay in the delivery of intra-arterial treatment for acute ischemic stroke in the MR CLEAN trial

MR CLEAN Investigators

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33 Citations (Scopus)


OBJECTIVE: The effect of intra-arterial treatment (IAT) for acute ischemic stroke is highly time-dependent. We investigated the delay of IAT and factors associated with such delay.

METHODS: MR CLEAN was a randomized trial of IAT plus usual care versus usual care alone (n=500). With multivariable linear regression, we analyzed the effect of intravenous treatment, general anesthesia, off-hours and inter-hospital transfer on time to admission to the emergency department (ED) of the intervention center and time to treatment. Furthermore, we assessed compliance with a target of 75 min for time from ED to treatment, and calculated the potential absolute increase in the number of patients with a good outcome (modified Rankin Scale score ≤2) if this target had been achieved in all treated patients.

RESULTS: Inter-hospital transfer prolonged time to ED by 140 min (95% CI 129 to 150) but reduced time from ED to treatment by 77 min (95% CI 64 to 91). Time from ED to treatment was increased by 19 min by general anesthesia (95% CI 5 to 33) and total time was increased by 23 min during off-hours (95% CI 6 to 40). The in-hospital target was achieved in 11.5% (22/192) of patients. Full compliance with the target time of 75 min from ED to treatment would have increased the proportion of patients with a good outcome by 7.6% (95% CI 6.7% to 8.5%).

CONCLUSION: Inter-hospital transfer is an important cause of delay in the delivery of IAT and every effort should be made to avoid transfers and reduce transfer-related delay. Furthermore, in-hospital workflow should be optimized to improve functional outcome after IAT.

Original languageEnglish
Pages (from-to)424-428
Number of pages5
JournalJournal of NeuroInterventional Surgery
Issue number5
Early online date2017
Publication statusPublished - May 2018


  • Administration, Intravenous
  • Aged
  • Aged, 80 and over
  • Brain Ischemia/epidemiology
  • Endovascular Procedures/adverse effects
  • Female
  • Humans
  • Male
  • Middle Aged
  • Netherlands/epidemiology
  • Prospective Studies
  • Retrospective Studies
  • Stroke/epidemiology
  • Time-to-Treatment/standards
  • Treatment Outcome
  • Workflow

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