Let's Talk About Ischemic Stroke

Updated:Jan 29,2018
The majority of strokes occur when blood vessels to the brain become narrowed or clogged with fatty deposits called plaque. This cuts off blood flow to brain cells. A stroke caused by lack of blood reaching part of the brain is called an ischemic stroke. High blood pressure is a leading risk factor for ischemic stroke that you can change.

Are all ischemic strokes the same?

There are two main types of ischemic strokes.
  • Thrombotic strokes are caused by a blood clot (thrombus) in an artery going to the brain. The clot blocks blood flow to part of the brain. Blood clots usually form in arteries damaged by plaque.
  • Embolic strokes are caused by a wandering clot (embolus) that’s formed elsewhere (usually in the heart or neck arteries). Clots are carried in the bloodstream and block a blood vessel in or leading to the brain.
How are ischemic strokes diagnosed?

When someone has shown symptoms of a stroke or a TIA (transient ischemic attack), a doctor will gather information and make a diagnosis. He or she will review the events that have occurred and will:
  • get a medical history from you or a family member
  • do a physical and neurological examination
  • have certain lab (blood) tests done
  • get a CT (computed tomography) or MRI (magnetic resonance imaging) scan of the brain
  • study the results of other diagnostic tests that might be needed

How are ischemic strokes treated?

Acute treatment is the immediate treatment given by the healthcare team when a stroke happens. The goal of acute treatment is to keep the amount of brain injury as small as possible. This is done by restoring blood flow to the part of the brain where the blockage was quickly.

There is a clot-dissolving drug called IV Alteplase (tPA) to treat stroke. It can stop a stroke in progress and reduce disability from stroke by breaking up a blood clot that might be stopping the flow of blood to the brain. To be eligible for Alteplase, you must seek emergency treatment right away and have a clot-caused stroke. It must be given within 3 to 4.5 hours after symptoms start. Medication may also be used to treat brain swelling that sometimes occurs after a stroke.

For people with blood clots in larger arteries, Alteplase may not dissolve them completely. In this case, a procedure, called mechanical thrombectomy, should be done within six to 24 hours of the first symptoms of stroke. In most cases this is done only after the patient receives IV Alteplase. To remove the clot, doctors thread a catheter (thin tube) with a stent through an artery in the groin up to the blocked artery in the brain. The stent opens and grabs the clot. The doctors then remove the stent with the trapped clot. If necessary, other devices may also be used. Patients must meet certain criteria to be eligible for this procedure.

When someone has a stroke, they are at risk of another. Once the medical team identifies what caused the stroke, they may prescribe treatments or procedures to reduce the risk of a second stroke, such as:

  • Antiplatelet agents such as aspirin and clopidogrel and anticoagulants interfere with the blood's ability to clot. This can play an important role in preventing a stroke.
  • Carotid endarterectomy is a procedure in which blood vessel blockage (blood clot or fatty plaque) is surgically removed from the carotid artery in the neck. This reopens the artery and the blood flow to the brain. This is only done in people who have a large blockage.
  • Doctors sometimes use balloon angioplasty and implantable steel screens called stents to treat and reduce fatty buildup clogging a vessel that may make it easy for clots to form in the bloodstream.

Sometimes a stroke is the first sign a person has of other health conditions, such as high blood pressure, diabetes, atrial fibrillation (a heart rhythm disorder) or other vascular disease. If any of these are diagnosed, the healthcare team will prescribe appropriate treatment. 

How can I learn more?

  1. Call 1-888-4-STROKE (1-888-478-7653) to learn more about stroke or find local support groups, or visit StrokeAssociation.org.
  2. Sign up to get Stroke Connection magazine, a free magazine for stroke survivors and caregivers at strokeconnection.org.
  3. Connect with others sharing similar journeys with stroke by joining our Support Network at strokeassociation.org/supportnetwork.

We have many other fact sheets to help you make healthier choices to reduce your risk, manage disease or care for a loved one. Visit strokeassociation.org/letstalkaboutstroke to learn more. 

Do you have questions for your doctor or nurse?

Take a few minutes to write your own questions for the next time you see your healthcare provider:

What can I do to help prevent another stroke?

What medications may I be given?

©2018, American Heart Association

Multi-language Fact Sheet Topics

Heart-related Conditions
What is Angina?
What is an Arrhythmia?
What Is Atrial Fibrillation?
What Do My Cholesterol Levels Mean?
How Can I Improve My Cholesterol?
What Are High Blood Cholesterol and Triglycerides?
What Is High Blood Pressure?
How Can I Reduce High Blood Pressure?
High Blood Pressure and Stroke
What Is Diabetes and How Can I Manage It?
How Can I Live With Heart Failure?
What Is Heart Failure?
What Is a Heart Attack?
How Will I Recover From My Heart Attack?
What Are the Warning Signs of Heart Attack?
What Are Heart Disease and Stroke?
What is Metabolic Syndrome?
What is Peripheral Artery Disease?

Stroke, Recovery and Caregiving
Hemorrhagic Stroke
Ischemic Stroke
Stroke, TIA and Warning Signs
What Are the Warning Signs of Stroke?
Stroke Risk Factors
Lifestyle Changes to Prevent Stroke
Stroke Diagnosis
Complications After Stroke
Changes Caused by Stroke
Emotional Changes After Stroke
Feeling Tired After a Stroke
Stroke and Aphasia
Stroke and Rehabilitation
Stroke Family Caregivers
How Should I Care for Myself as a Caregiver?

Treatment, Tests and Procedures
What is Cholesterol-Lowering Medicine?
What is High Blood Pressure Medicine?
What Are Anticoagulants and Antiplatelet Agents?
How Do I Manage My Medicines?
What Is an Implantable Cardioverter Defibrillator?
What Is a Pacemaker?
What Is Coronary Angioplasty?
What is a Stent?
What is Coronary Bypass Surgery?
What is a Coronary Angiogram?
How Can I Recover From Heart Surgery?
What is Carotid Endarterectomy?

Healthy Lifestyle and Risk Reduction
How Can I Manage My Weight?
How Can Physical Activity Become a Way of Life?
Why Should I Be Physically Active?
How Do I Follow a Healthy Diet?
How Can I Cook Healthfully?
Why Should I Limit Sodium?
How Do I Understand "Nutrition Facts" Labels?
How Can I Quit Smoking?
How Can I Manage Stress?
How Can I Make My Lifestyle Healthier?
How Can I Monitor My Cholesterol, Blood Pressure and Weight?