What is the difference between thrombolysis and thrombectomy for ischemic stroke?
Thrombolysis or thrombectomy for ischemic stroke: how each works, their risks, when they are combined, how the care team makes a decision, and what to ask.
By Dr. Martin Roberto Casas MartínezOct 11, 20265 min read
In this article
Summary: Thrombolysis is a medication given through a vein that helps dissolve the clot blocking an artery in the brain; thrombectomy is a procedure in which a catheter is advanced to that artery to remove the clot. Both aim to restore blood flow, can be combined, and the emergency team decides which is appropriate after imaging tests.
A cerebral infarction, also called an ischemic stroke, occurs when a clot blocks an artery that carries blood to the brain. If you are accompanying a family member at the hospital, understanding the difference between thrombolysis and thrombectomy for a cerebral infarction can help you follow the care team’s explanations.
If someone is experiencing sudden symptoms now, such as a drooping face, weakness on one side of the body, or difficulty speaking, stop reading and call 911.
What is thrombolysis?
It is the administration of a thrombolytic medication through a vein. The medication helps dissolve the clot so blood can reach the brain again. It is used only when the stroke is caused by a clot, never when there is bleeding in the brain.
The decision is based on a CT scan that rules out bleeding, a physical examination, and the medical history. Some conditions may prevent its use, such as bleeding problems, recent surgery or trauma, or certain anticoagulants; the care team reviews these on a case-by-case basis. The most common risk is bleeding, which can be serious.
What is thrombectomy?
It is an endovascular procedure: a catheter is inserted into an artery, usually in the groin, and guided to the blocked artery in the brain. The clot is then removed with a device. It is usually considered when the clot blocks a large artery.
During the procedure, contrast dye is injected to visualize the blood vessels and locate the clot. A stent retriever, a small metal mesh that opens inside the clot, traps it, and is withdrawn with it, is often used. IMSS guidelines state that the procedure must be performed by specialists in neurological endovascular therapy at tertiary-care hospitals with the necessary resources.
How are they similar, and how are they different?
Both aim to restore blood flow as quickly as possible, but one does this with medication and the other mechanically. They also differ in how they are performed, who performs them, and the risks involved.
General comparison of thrombolysis and thrombectomy
- •How it works — Thrombolysis: Dissolves the clot. Thrombectomy: Removes the clot
- •How it is performed — Thrombolysis: Medication given through a vein. Thrombectomy: A catheter inserted through an artery and guided with X-rays
- •Main risk — Thrombolysis: Bleeding, including bleeding in the brain. Thrombectomy: Catheter-related risks, such as bleeding at the entry site or damage to an artery
Can both be used?
Yes. When a person is eligible for both, IMSS guidelines state that they should receive thrombolysis even while being evaluated for thrombectomy; one treatment should not be delayed because of the other.
Thrombectomy may also be considered for people who cannot receive the medication, for example because of the risk of bleeding. Whether to use both treatments, just one, or neither depends on the affected artery, the time elapsed, imaging results, and the person’s condition before the infarction. Neither treatment guarantees recovery; the care team explains the expected benefits and risks in each case.
How does the care team decide which treatment is appropriate?
Using urgent imaging tests and a neurological assessment: first, the team confirms that it is an infarction and not a hemorrhage, then checks which artery is blocked and whether the person can receive each treatment.
- •Initial evaluation and stabilization (breathing, blood pressure, level of alertness).
- •CT scan or MRI to rule out bleeding.
- •CT angiography to view the arteries when thrombectomy is being considered.
- •Lab tests and a review of medications taken previously.
That is why no one can know from home whether one treatment or the other is appropriate. The only useful step outside the hospital is to call 911 as soon as possible: the sooner treatment begins, the greater the probability of a good outcome.
Frequently asked questions
If several hours have passed, is it still worth going to the hospital?
Yes. Even if time has passed, call 911: the care team uses imaging tests to assess what options are available, and this cannot be determined from home. Early care also helps monitor for and prevent complications, even if neither of these treatments is used.
Does thrombectomy require opening the skull?
No. It is performed from inside the blood vessels, through a catheter inserted into an artery in the groin or wrist. Even so, it is an invasive procedure, and the care team should explain the risks to you before performing it.
If my family member received neither treatment, were they treated poorly?
Not necessarily. Many people are not candidates because of the time that has passed, the affected artery, the risk of bleeding, or another condition. Ask the care team why that decision was made and what the care plan is.
What should you ask the treating team?
If someone is having sudden symptoms right now, call 911 first. If your family member is already in the hospital, you can ask:
- •What did the imaging tests show, and which artery is affected?
- •Did they receive thrombolysis, thrombectomy, or neither, and why?
- •What risks are you monitoring now, and what changes should I report to the staff right away?
For non-urgent questions or to request an individual assessment, you can contact the office.
Informational notice: This content is for informational purposes and does not replace a medical consultation or constitute a diagnosis.
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