Transforming Pre‑Hospital Stroke Triage

A one-minute neurological exam for prehospital stroke triage, measured on the device.

Why it matters

What Cerevio does

Cerevio guides a standardized exam on an ordinary laptop or tablet, then derives objective, continuous measurements from the device’s own camera and microphone. No network. No contact. No accessories.

Why it matters

The field decision matters in both directions.

Patients with a large vessel occlusion (LVO) stroke do best at a hospital that can remove the clot, and the benefit of thrombectomy falls with every minute of delay.1,2

Patients first taken to a closer hospital and then transferred reach reperfusion later and have worse outcomes.3 Bypassing a closer hospital for a patient without an LVO delays other treatment.

Prehospital scales such as RACE, FAST-ED and LAMS are scored by hand. Their accuracy has generally been lower in prospective field use than in the cohorts that derived them, and varies with examiner and setting.4,5 Each scale also reduces graded signs to a few categories, discarding information a continuous measurement keeps.

1,900,000

neurons a typical untreated large vessel stroke would have destroyed since you opened this page, at 1.9 million a minute.6

110 minutes

median added delay to reperfusion when a patient is first taken to a hospital that can’t remove the clot (311.5 vs 202 minutes).3

Design principles

Built to be checked, not taken on faith.

The same exam for every patient

Instructions and visual targets are presented on screen and timed, so every patient receives the same stimulus regardless of who runs the exam.

Measurements, not impressions

Findings are recorded as continuous values scaled to each person’s anatomy, so they are comparable across devices and distances.

On-device and offline

Processing runs on the device itself, with no server, cloud service or network connection.

Transparent by design

The planned decision model is a small, inspectable statistical model rather than a black box, so each result can be traced to the measurements behind it.

Where we are

Preparing for our first clinical validation.

On the pathway for an investigator‑initiated, two‑phase study at a U.S. comprehensive stroke center.

Working with us.

We welcome conversations with EMS agencies, stroke centers and research partners interested in objective prehospital stroke assessment.

Your message goes straight to our team.

References

  1. Saver JL, Goyal M, van der Lugt A, et al. Time to treatment with endovascular thrombectomy and outcomes from ischemic stroke: a meta-analysis. JAMA. 2016;316(12):1279-1288. ↩
  2. Goyal M, Menon BK, van Zwam WH, et al. Endovascular thrombectomy after large-vessel ischaemic stroke: a meta-analysis of individual patient data from five randomised trials. Lancet. 2016;387(10029):1723-1731. ↩
  3. Froehler MT, Saver JL, Zaidat OO, et al. Interhospital transfer before thrombectomy is associated with delayed treatment and worse outcome in the STRATIS Registry. Circulation. 2017;136(24):2311-2321. ↩
  4. Duvekot MHC, Venema E, Rozeman AD, et al. Comparison of eight prehospital stroke scales to detect intracranial large-vessel occlusion in suspected stroke (PRESTO): a prospective observational study. Lancet Neurol. 2021;20(3):213-221. ↩
  5. Smith EE, Kent DM, Bulsara KR, et al. Accuracy of prediction instruments for diagnosing large vessel occlusion in individuals with suspected stroke: a systematic review for the 2018 Guidelines for the Early Management of Patients With Acute Ischemic Stroke. Stroke. 2018;49(3):e111-e122. ↩
  6. Saver JL. Time is brain—quantified. Stroke. 2006;37(1):263-266. ↩