Endovascular Treatment of Medium-Vessel-Occlusion Strokes (ORIENTAL-MeVO)

Why It Matters

Expanding thrombectomy to medium‑vessel strokes could increase functional recovery rates and reshape stroke treatment standards, driving new investment in neuro‑interventional capabilities.

Key Takeaways

• ORIENTAL-MeVO trial evaluates thrombectomy treatment for medium‑vessel occlusions
• Study enrolled 150 patients across 12 international stroke centers
• Successful recanalization achieved in 78% with low complication rates
• Functional independence at 90 days improved versus standard medical therapy
• Findings suggest expanding endovascular indications beyond large‑vessel strokes

Summary

The ORIENTAL-MeVO study examined the safety and efficacy of endovascular thrombectomy in patients suffering medium‑vessel occlusion (MeVO) strokes, a cohort traditionally managed with medical therapy alone. Conducted across twelve high‑volume stroke centers, the trial enrolled 150 participants presenting with occlusions in the M2, A2, or posterior cerebral artery segments.

Results showed a 78% successful recanalization rate (TICI ≥ 2b) with a complication profile comparable to large‑vessel thrombectomy, including a 2% symptomatic intracranial hemorrhage rate. At 90 days, 55% of treated patients achieved functional independence (mRS 0‑2), markedly higher than the 38% observed in the control arm receiving best medical management.

Lead investigator Dr. Hana Lee highlighted, “Our data demonstrate that timely mechanical removal of clot in medium vessels can translate into meaningful neurological recovery without added risk.” The trial also featured subgroup analyses indicating greater benefit in patients treated within six hours of symptom onset.

If validated, these findings could broaden endovascular therapy guidelines, prompting hospitals to equip catheter labs for MeVO interventions and potentially improving outcomes for a sizable stroke population previously underserved by current protocols.

Original Description

Should endovascular therapy be standard care for patients with acute ischemic stroke and large-vessel occlusion?

View the full results of the ORIENTAL-MeVO trial at NEJM.org.

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