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Optimized Management of Endovascular Treatment for Acute Ischemic Stroke
Published on: January 18, 2018
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Unmet Needs in Acute Ischemic Stroke: Overcoming Recalcitrant Clots
Mahmood Mirza1, Christian Ulfert, Ray McCarthy
1From the Research Department, Johnson and Johnson Medtech Neurovascular, Galway, Ireland.
Cardiology in Review
|June 27, 2025
Summary
Recalcitrant clots in acute ischemic stroke treatment pose challenges to endovascular thrombectomy. Understanding clot properties and developing innovative retrieval devices are key to improving recanalization rates.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Vascular Surgery
Background:
- Endovascular thrombectomy significantly improves outcomes for acute ischemic stroke.
- Recalcitrant clots, occurring in up to 20% of cases, resist standard treatment and negatively impact outcomes.
- Understanding the characteristics of these challenging clots is crucial for developing effective strategies.
Purpose of the Study:
- To review the multifaceted nature of recalcitrant clots in acute ischemic stroke.
- To explore insights from preclinical, imaging, and clinical studies on clot properties and retrieval challenges.
- To discuss current and emerging strategies for overcoming difficulties in recanalizing tough clots.
Main Methods:
- Ex-vivo clot characterization to identify features of recalcitrant clots (e.g., RBC-poor, fibrin-rich).
- Analysis of preclinical models demonstrating clot properties like stiffness and stickiness.
- Review of imaging markers associated with recalcitrant clots and evaluation of novel retrieval technologies.
Main Results:
- Recalcitrant clots often exhibit specific compositions (e.g., fibrin-rich, platelet-rich) and physical properties (stiffness, toughness).
- Imaging markers like absence of the hyperdense artery sign correlate with recalcitrant clots, but reliable predictors are lacking.
- Innovations like specialized stent-retrievers and aspiration catheters show promise, yet complete recanalization remains a challenge.
Conclusions:
- Tough clots present significant challenges in endovascular thrombectomy, necessitating advanced approaches.
- Further research into clot-vessel wall interactions and improved retrieval techniques is essential.
- Overcoming recalcitrant clot retrieval is vital for enhancing clinical outcomes in acute ischemic stroke.
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