Endovascular Treatment (EVT) Resource Centre

This resource centre provides health system planners and clinicians with tools and resources to support implementation of EVT. It is adapted from the “Ontario Endovascular Treatment Implementation Framework” created by the Provincial Working Group for EVT Treatment. Resources are divided into three categories:

  • Pre-Treatment (Dispatch and EMS Screening, ED Assessment and Triage, Imaging Protocols)
  • Treatment (Referring Site, EVT Centre)
  • Post-Treatment (Admission to Stroke Unit, Repatriation and Communication, Follow Up and Prevention)

If you have resources or tools you would like to share on this site, please send them to oh-corh_service@ontariohealth.ca.


EVT is a stroke treatment for patients with acute ischemic strokes that removes large stroke-causing clots from the brain and substantially improves the chance for a better outcome. Time-is-brain in acute stroke treatment and prolonged times to accessing EVT may reduce benefits for eligible patients.

There have been five major trials that demonstrated efficacy with major functional benefits for patients. The ESCAPE trial revealed that a procedure called Endovascular Therapy (EVT) increased positive outcomes by 25% and reduced the death rate by 50% from major ischemic strokes. The procedure, EVT, involves mechanical clot disruption (embolectomy) carried out by neuroradiologists, neurosurgeons, or neurologists with neurointerventional expertise. The Mr. Clean Trial was the one study that was completed and demonstrated positive outcomes for patients. Subsequent to Mr Clean, the ESCAPE trial was stopped early due to overwhelming positive results and concurrent positive results of the EXTEND-IA trial. Two further trials SWIFT-PRIME, and REVASCAT have been stopped early and results have been published.

computer generated image of catheter advancing up vessel and deploying embolectomy device

To learn more about Endovascular Thrombectomy, click here.

CorHealth Ontario established a Provincial Working Group to develop an implementation strategy for Endovascular Treatment (EVT) across the province, in conjunction with clinical experts.

To adapt our stroke system to support patients’ access to endovascular therapy, CorHealth Ontario is working with stakeholders from across the province. Stakeholders include: EMS, CritiCall Ontario, Emergency Medicine, Stroke Neurology, Regional Stroke Centres, District Stroke Centres, Telestroke, and Neurointerventional/Stroke Endovascular teams.

Current revisions to our system of early stroke care are underway to provide timely access to endovascular therapy for eligible patients, including:

  • EMS triage, transport pathways, and inter-hospital referrals
  • Access to immediate brain and vascular imaging
  • System protocols for medical redirect and repatriation
  • Geographical barriers to EVT

Each stroke region is working with their partners and stakeholders to support access to acute EVT therapy.

EVT Centres

In Ontario, there are currently ten hospitals providing EVT. Seven hospitals provide EVT 24/7 and three hospitals provide EVT within an alternate model (i.e. single service provider). To find the closest EVT treatment site to you, please visit these websites below:

To learn more about the clinical and business criteria required to expand specialized stroke services to include Endovascular Thrombectomy (EVT), click here.