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What Is Mechanical Thrombectomy?

Mechanical thrombectomy is an emergency endovascular procedure that removes a blood clot from a blocked artery in the brain during an acute ischemic stroke. It is primarily used for selected patients with large-vessel occlusion, or LVO. A catheter is advanced through an artery to the site of the blockage, where a stent retriever, aspiration catheter, or both are used to extract the clot. Restoring blood flow quickly can limit brain injury and improve the chance of functional recovery.

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What Is Mechanical Thrombectomy?

Mechanical thrombectomy is an emergency endovascular procedure that removes a blood clot from a blocked artery in the brain during an acute ischemic stroke. It is primarily used for selected patients with large-vessel occlusion, or LVO. A catheter is advanced through an artery to the site of the blockage, where a stent retriever, aspiration catheter, or both are used to extract the clot. Restoring blood flow quickly can limit brain injury and improve the chance of functional recovery.

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Why Is Mechanical Thrombectomy Performed?

The procedure is performed for selected patients with acute ischemic stroke caused by an occlusion in a major intracranial artery. Brain and vascular imaging are used to confirm the blockage and estimate how much brain tissue is already irreversibly injured versus still potentially salvageable. Current stroke guidelines support endovascular thrombectomy for broader groups of eligible patients than older criteria allowed, including selected patients with larger ischemic cores and basilar artery occlusion. Treatment remains highly time-sensitive, so evaluation and transfer to an endovascular-capable stroke center should proceed as rapidly as possible.

How Is Mechanical Thrombectomy Performed?

An interventional specialist inserts a catheter through an artery, commonly in the groin or wrist, and advances it under X-ray guidance toward the blocked brain artery. A stent retriever can be deployed through the clot so it becomes trapped in the device, while aspiration catheters can remove clot with suction. The clot is withdrawn through the catheter system, and angiography is used to assess how well blood flow has been restored. More than one retrieval pass or a combination of devices can be required when the first attempt does not achieve adequate reperfusion.

What Is Recovery Like After Mechanical Thrombectomy?

After thrombectomy, the patient is monitored in a stroke unit or intensive-care setting for neurologic changes, blood pressure, bleeding, and complications of reperfusion. Follow-up brain imaging can be used to check for hemorrhage, swelling, or additional injury. Rehabilitation can include physical, occupational, and speech therapy depending on the deficits caused by the stroke. Recovery varies widely because outcome depends on clot location, speed of reperfusion, amount of brain injury, age, other medical conditions, and complications.

What Are the Risks and Complications?

Possible complications include bleeding at the catheter site, injury to an artery, vessel dissection, perforation, clot migration, and failure to restore blood flow. Intracranial hemorrhage is one of the most serious complications and can worsen neurologic injury. Contrast reactions and kidney injury are also possible, particularly in patients with relevant risk factors. Even technically successful thrombectomy cannot reverse brain tissue that was already permanently damaged before blood flow was restored.

Frequently Asked Questions About Mechanical Thrombectomy

How quickly must mechanical thrombectomy be performed?

It should be performed as quickly as possible after an eligible stroke is identified. Selected patients can benefit within extended windows of up to 24 hours when imaging and clinical criteria support treatment.

Is mechanical thrombectomy the same as clot-busting medicine?

No. Thrombectomy physically removes the clot with a catheter, while intravenous thrombolytic medicine dissolves clot chemically. Eligible patients can receive both treatments.

What is a stent retriever?

A stent retriever is a temporary mesh-like device that opens within a clot, captures it, and allows the clot to be withdrawn through the catheter system.

Can mechanical thrombectomy completely reverse a stroke?

It can greatly improve outcome when blood flow is restored quickly, but it cannot reliably reverse brain damage that occurred before reperfusion.

References

2026 Guideline for the Early Management of Patients With Acute Ischemic Stroke: A Guideline From the American Heart Association/American Stroke Association. American Heart Association. https://www.ahajournals.org/doi/10.1161/STR.0000000000000513. Date Accessed September 11, 2026.

Ischemic Stroke (Clots). American Stroke Association. https://www.stroke.org/en/about-stroke/types-of-stroke/ischemic-stroke-clots. Date Accessed September 11, 2026.

Optimizing Endovascular Therapy for Ischemic Stroke. National Institute of Neurological Disorders and Stroke. https://www.ninds.nih.gov/about-ninds/what-we-do/impact/ninds-contributions-approved-therapies/optimizing-endovascular-therapy-ischemic-stroke. Date Accessed September 11, 2026.

Thrombectomy. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK562154/. Date Accessed September 11, 2026.

Trial of Endovascular Thrombectomy for Large Ischemic Strokes. PubMed. https://pubmed.ncbi.nlm.nih.gov/36762865/. Date Accessed September 11, 2026.