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Navigating the distal vasculature: Challenges and lessons learned from failed Thrombectomy trials
Peter B Sporns1,2,3, Mohammad Almohammad4, Jens Minnerup5
1Department of Radiology and Neuroradiology, Stadtspital Zürich, Zürich, Switzerland.
Summary
Endovascular thrombectomy (EVT) for distal medium vessel occlusions (DMVOs) showed no benefit over standard care in recent trials. Safety concerns and technical challenges limit routine EVT for DMVO stroke.
Area of Science:
- Neurology
- Interventional Neuroradiology
- Stroke Medicine
Background:
- Endovascular thrombectomy (EVT) is standard for large vessel occlusion stroke.
- Recent trials (DISTAL, ESCAPE-MeVO, DISCOUNT) yielded neutral results for extending EVT to distal medium vessel occlusions (DMVOs).
Purpose of the Study:
- Critically examine EVT's lack of benefit in DMVO trials.
- Assess procedural and clinical challenges in distal interventions.
- Explore future directions for treating distal cerebrovascular occlusions.
Main Methods:
- Synthesized findings from recent DMVO thrombectomy trials.
- Contextualized results with anatomical, technical, and clinical limitations.
- Highlighted innovations in devices and techniques for distal EVT.
Main Results:
- No functional benefit of EVT over best medical therapy for unselected DMVO patients.
- Increased rates of symptomatic intracranial hemorrhage and mortality in EVT arms.
- Contributing factors: fragile/tortuous vessels, device issues, operator variability, imaging/selection limits.
Conclusions:
- Routine EVT for DMVO stroke is not recommended based on current evidence.
- Future research needs patient stratification, dedicated distal devices, and procedural innovation.
- Safe and effective treatment in distal territories requires further development.
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