Endovascular Thrombectomy
Fellowship-trained cerebrovascular and endovascular neurosurgeons • 12 hospital affiliations across New Jersey
Endovascular thrombectomy is a catheter-based procedure that mechanically removes a large blood clot from a brain artery to restore blood flow during an acute ischemic stroke. It is the most effective stroke treatment available for large vessel occlusion strokes and can be performed up to 24 hours from stroke onset in selected patients dramatically reducing disability and death when performed quickly by an experienced neurointerventional team.
Key takeaways
- Endovascular thrombectomy mechanically removes a blood clot from a blocked brain artery, restoring blood flow and limiting brain damage.
- It is the standard of care for appropriately selected patients with acute large vessel occlusion (LVO) stroke and can substantially improve the likelihood of functional independence compared with medical therapy alone.
- Time is critical even with an expanded treatment window of up to 24 hours for selected patients, faster reperfusion leads to better outcomes.
- Advanced CT or MRI imaging identifies patients who are most likely to benefit by demonstrating salvageable brain tissue (the penumbra).
- Atlantic Brain and Spine provides 24/7 neurointerventional stroke coverage across multiple Comprehensive Stroke Centers in New Jersey.
| Procedure type | Mechanical removal of an intracranial blood clot using catheter-based technology |
| Setting | Emergency procedure performed as quickly as possible after stroke onset |
| Anesthesia | General anesthesia or conscious sedation, depending on the patient's condition |
| Procedure time | Approximately 30 to 90 minutes |
| Hospital stay | Intensive care monitoring followed by hospitalization; total length of stay varies based on stroke severity and recovery |
| Treatment window | Up to 24 hours from last known well for appropriately selected patients with salvageable brain tissue |
| Primary goal | Rapid restoration of blood flow to preserve threatened brain tissue and improve neurological outcomes |
Timing and stay vary by patient and complexity. Your surgeon will confirm what to expect in your case.
How endovascular thrombectomy works
When a blood clot blocks a major brain artery most commonly the internal carotid artery or middle cerebral artery blood flow to part of the brain stops. Without oxygen, brain cells begin to die within minutes. The surrounding area of threatened but still viable brain tissue, known as the ischemic penumbra, can often be saved if blood flow is restored quickly.
Endovascular thrombectomy is performed emergently in a specialized angiography suite. A catheter is inserted through an artery in the wrist or groin and carefully navigated to the blocked artery in the brain under X-ray guidance. A stent retriever, aspiration catheter, or a combination of both is used to remove the clot and restore blood flow.
Modern thrombectomy techniques frequently combine aspiration and stent retrieval to maximize the likelihood of successful reperfusion while minimizing procedure time.
Time window and patient selection
Thrombectomy was originally limited to patients treated within 6 hours of stroke onset. Two landmark trials—DAWN and DEFUSE 3—expanded the treatment window to 24 hours for carefully selected patients with advanced imaging demonstrating a mismatch between the irreversibly injured ischemic core and salvageable brain tissue (the penumbra). CT perfusion or MRI perfusion imaging performed in the emergency department helps identify these patients.
Even within the extended treatment window, faster treatment leads to better outcomes. The phrase “time is brain” reflects the fact that approximately 1.9 million neurons are lost every minute during a large vessel occlusion stroke. Every step of the stroke pathway is designed to minimize the time from hospital arrival to successful restoration of blood flow.
Benefits and risks
Potential benefits
- Can more than double the likelihood of functional independence compared with medical therapy alone in appropriately selected patients.
- Can be performed up to 24 hours after stroke onset in carefully selected patients with salvageable brain tissue on advanced imaging.
- High technical success rate, with successful reperfusion (TICI 2b/3) achieved in approximately 70–85% of cases.
- 24/7 neurointerventional stroke coverage across Comprehensive Stroke Centers.
Possible risks
- Symptomatic intracerebral hemorrhage from reperfusion injury (approximately 5 to 7%)
- Vessel dissection or perforation from catheter manipulation
- Embolization of clot fragments to new territories
- The procedure does not guarantee recovery outcomes depend on the extent of infarct before reperfusion and the speed of treatment
Your surgeon will review the benefits and risks specific to your diagnosis during your consultation.
What recovery looks like
Recovery after endovascular thrombectomy depends primarily on the severity of the stroke and the amount of brain tissue affected, rather than the procedure itself.
- Immediately after the procedure Admission to the neurological intensive care unit for close neurological monitoring, blood pressure management, and observation for complications such as hemorrhagic transformation.
- Days 1 to 5 Physical, occupational, and speech therapy begin as soon as the patient is medically stable to maximize neurological recovery.
- Weeks 1 to 4 Patients with persistent neurological deficits may transition to inpatient rehabilitation or continue therapy as an outpatient, depending on the severity of the stroke.
- 1 to 3 months Neurological recovery continues. Ongoing rehabilitation, risk factor management, and stroke prevention including control of blood pressure, cholesterol, diabetes, heart rhythm disorders, and appropriate antiplatelet or anticoagulant therapy help reduce the risk of future stroke.
Frequently asked questions
How is thrombectomy different from tPA (clot-busting drug)?
IV tPA is a thrombolytic drug given intravenously that dissolves clots chemically. It is effective for many strokes but cannot dissolve large clots in major vessels efficiently. Thrombectomy physically removes the clot and achieves higher recanalization rates for large vessel occlusion. The two treatments are complementary — eligible patients receive IV tPA and then thrombectomy if a large vessel occlusion is confirmed on imaging.
Can I have thrombectomy if I am on blood thinners?
Yes, in many cases. Thrombectomy can be performed in patients on anticoagulant therapy, though the risk of bleeding complications is higher. The interventional team weighs the risk of hemorrhagic transformation against the benefit of reperfusion for each individual patient.
What is the chance of a good outcome after thrombectomy?
Approximately 46 to 50% of patients treated with thrombectomy achieve functional independence at 90 days — compared to approximately 13 to 26% treated with medical therapy alone. Outcomes depend heavily on how quickly treatment is delivered, the location and extent of the infarct, and patient age and pre-existing health.
How quickly after calling 911 can I receive thrombectomy?
The target door-to-reperfusion time at comprehensive stroke centers is under 60 to 90 minutes from hospital arrival. Atlantic Health System hospitals are designated stroke centers with 24/7 neurointerventional coverage and streamlined stroke protocols to minimize every step of the time-to-treatment pathway.
This page is for general education and does not replace medical advice. Treatment decisions should be made with a qualified neurosurgeon based on your individual diagnosis and imaging. To discuss your options, call Atlantic Brain and Spine at 973.993.7100 or request a consultation.
Neurointerventional Stroke Specialists at Atlantic Brain and Spine
Your care is provided by Atlantic Brain and Spine's multidisciplinary cerebrovascular team, including fellowship-trained cerebrovascular and endovascular neurosurgeons.
