Systematic Review of Transradial Access for Flow Diversion of Intracranial Aneurysms

World Neurosurg. 2021 Jul;151:6-11. doi: 10.1016/j.wneu.2021.04.012. Epub 2021 Apr 20.


Background: Transradial access is an increasingly popular route for cerebral angiography and neurointerventions. However, obstacles to wider adoption remain, especially for complex interventions typically performed with larger, multiaxial systems such as flow diversion. We sought to analyze the published evidence for transradial flow diversion of intracranial aneurysms.

Methods: Using Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) guidelines, a literature review was performed to identify all published reports and studies of transradial flow diversion for intracranial aneurysm. The search was limited from April 2011 to February 2021. Primary outcome was successful completion of the procedure via a transradial approach. Heterogeneity was analyzed with Q and I2 statistics. Secondary outcomes were transradial access-site complications and other complications.

Results: In total, 11 studies involving 290 treated aneurysms were identified; 90.7% of the procedures were completed via the transradial approach. The heterogeneity between studies was high, with an I2 of 56.9%. There were no transradial access-site complications. The procedural complication rate was 2.41%.

Conclusions: Transradial access has a high success rate for both anterior and posterior circulation flow-diversion embolizations. The success rate may be particularly high for posterior circulation and right anterior circulation aneurysms. It has a negligible access-site complication rate. Transradial access is a viable alternative to transfemoral access for flow diversion and should be considered as a first-line approach.

Keywords: Brain aneurysm; Flow diversion; Neurointervention; Transradial access.

Publication types

  • Systematic Review

MeSH terms

  • Embolization, Therapeutic / methods*
  • Humans
  • Intracranial Aneurysm / surgery*
  • Neurosurgical Procedures / methods*
  • Radial Artery / surgery*
  • Stents
  • Vascular Surgical Procedures / methods*