Stroke
Cerebrovascular disease; CVA; Cerebral infarction; Cerebral hemorrhage; Ischemic stroke; Stroke - ischemic; Cerebrovascular accident; Stroke - hemorrhagic; Carotid artery - stroke
A stroke occurs when blood flow to a part of the brain stops. A stroke is sometimes called a "brain attack."
If blood flow is cut off for longer than a few seconds, the brain cannot get nutrients and oxygen. Brain cells can die, causing lasting damage.
A stroke can also occur if a blood vessel inside the brain bursts, leading to bleeding inside the head.
The major areas of the brain have one or more specific functions.
A carotid arteriogram is an X-ray study designed to determine if there is narrowing or other abnormality in the carotid artery, a main artery to the brain. This is an angiogram of the left common carotid artery (both front-to-back and side views) showing a severe narrowing (stenosis) of the internal carotid artery just beyond the division of the common carotid artery into the internal and external branches.
This is an angiogram of the right carotid artery showing a severe narrowing (stenosis) of the internal carotid artery just past the carotid fork. There is enlargement of the artery or ulceration in the area after the stenosis in this close-up film. Note the narrowed segment toward the bottom of the picture.
A stroke involves loss of brain functions caused by a loss of blood circulation to areas of the brain. The blockage usually occurs when a clot or piece of atherosclerotic plaque breaks away from another area of the body and lodges within the vasculature of the brain.
A stroke affecting the brain stem is potentially life threatening since this area of the brain controls functions such as breathing and instructing the heart to beat. Brain stem stroke may also cause double vision, nausea and loss of coordination. The brain stem also controls less essential abilities such as articulate speech.
The cerebellum processes input from other areas of the brain, spinal cord and sensory receptors to provide precise timing for coordinated, smooth movements of the skeletal muscular system. A stroke affecting the cerebellum may cause dizziness, nausea, balance and coordination problems.
The Circle of Willis is the joining area of several arteries at the bottom (inferior) side of the brain. At the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the cerebrum.
The left cerebral hemisphere controls movement of the right side of the body. Depending on the severity, a stroke affecting the left cerebral hemisphere may result in functional loss or motor skill impairment of the right side of the body, and may also cause loss of speech.
The right cerebral hemisphere controls movement of the left side of the body. Depending on the severity, a stroke affecting the right cerebral hemisphere may result in functional loss or motor skill impairment of the left side of the body. In addition, there may be impairment of the normal attention to the left side of the body and its surroundings.
Endarterectomy is a surgical procedure removing plaque material from the lining of an artery.
A heart attack or stroke may occur when an area of plaque (atherosclerosis) ruptures and a clot forms over the location, blocking the flow of blood to the organ's tissues.
Much of the brain is supplied blood by the internal carotid arteries.
Stroke is defined as a loss of brain function due to blocked blood circulation to the brain. Strokes may be caused by a narrowing, obstruction, or leak in the lining of the carotid. This leaking of blood into the artery wall (dissection) may cause a clot to form, reducing blood flow and raising the risk of a stroke. The leak may arise from an injury to the neck, which means stroke secondary to carotid dissection may occur in young people as well as older people.
When blood flow to an area of your brain stops, it's serious. It's called a stroke, and will often cause permanent, debilitating damage to your brain and change your life. Let's talk about strokes. If blood flow to your brain is stopped for longer than a few seconds, your brain can't get blood and oxygen. Brain cells die, causing permanent damage. There are two types, ischemic stroke and hemorrhagic stroke. Ischemic stroke happens when a blood clot forms in a very small artery, or when a blood clot breaks off from another artery and lodges in your brain. Hemorrhagic strokes can happen when a blood vessel in your brain becomes weak and bursts open. High blood pressure is the number one risk factor for strokes. People with atrial fibrillation, when your heart rhythm is fast and irregular, diabetes, a family history of stroke, and high cholesterol are most at risk. You are also at risk for stroke if you are older than age 55. Other risk factors include being overweight, drinking too much alcohol, eating too much salt, and smoking. Symptoms of a stroke usually develop suddenly, without warning. You may have a severe headache that starts suddenly, especially when you are lying flat, often when you awake from sleep. Your alertness may suddenly change. You may notice changes in your hearing, your sense of taste, and your sense of touch. You may feel clumsy or confused or have trouble swallowing or writing. So, how are strokes treated? A stroke is a medical emergency. Immediate treatment might save your life and reduce disability. Call your local emergency number -- or have someone call for you -- at the first sign of a stroke. Most of the time, someone having a stroke should be in the hospital within three hours after symptoms first begin. If a doctor suspects you've had a stroke, the doctor will check for problems with your vision, movement, feeling, reflexes, and your ability to understand and speak. You may have several tests to check for blocked or narrowed arteries. If the stroke is caused by a blood clot, you'll be given a clot-busting drug to dissolve the clot. Treatment depends on how bad your stroke is and what caused it. But you will probably need to stay in the hospital for a few days. Besides clot-busting drugs, called thrombolytics, you may need blood thinners, medicine to control high blood pressure, and surgery to unclog one of your carotid arteries-which carry blood to the brain. After your stroke, treatment will focus on helping you recover as much function as possible, and preventing future strokes. Most people need stroke rehabilitation therapy. If you can return home, you may need help making safety changes in your home and to help you with using the bathroom, cooking, dressing, and moving around your home. After a stroke, some people have trouble speaking or communicating with others, and a speech therapist might help. Depending on the severity of the stroke, you may have trouble with thinking and memory, problems with your muscles, joints, and nerves, trouble going to the bathroom, and difficulty swallowing and eating. Therapies and support for you and your family are available to help with each of these problems. Your treatment will also focus on preventing another stroke. You may need to be on several medications to help prevent this. And, eating healthy and controlling problems like diabetes and high blood pressure can be very important.
Causes
There are two major types of stroke:
- Ischemic stroke
- Hemorrhagic stroke
Ischemic stroke occurs when a blood vessel that supplies blood to the brain is blocked by a blood clot. This may happen in two ways:
- A clot may form in an artery that is already very narrow. This is called a thrombotic stroke.
- A clot may break off from another place in the blood vessels of the brain, or from some other part of the body, and travel up to the brain. This is called cerebral embolism, or an embolic stroke.
Ischemic strokes may also be caused by a sticky substance called plaque that can clog arteries.
A hemorrhagic stroke occurs when a blood vessel in part of the brain becomes weak and bursts open. This causes blood to leak into the brain. Some people have defects in the blood vessels of the brain that make this more likely. These defects may include:
- Aneurysm (weak area in the wall of a blood vessel that causes the blood vessel to bulge or balloon out)
- Arteriovenous malformation (AVM; abnormal connection between the arteries and veins)
- Cerebral amyloid angiopathy (CAA; condition in which proteins called amyloid build up on the walls of the arteries in the brain)
Hemorrhagic strokes may also occur when someone is taking blood thinners, such as dabigatran, rivaroxaban, apixaban, edoxaban and warfarin (Coumadin) or has a bleeding disorder. Very high blood pressure may cause blood vessels to burst, leading to hemorrhagic stroke.
An ischemic stroke can develop bleeding and become a hemorrhagic stroke.
High blood pressure is the main risk factor for strokes. Other major risk factors are:
- Irregular heartbeat, called atrial fibrillation
- Diabetes
- Family history of stroke
- Being male
- High cholesterol
- Increasing age, especially after age 55
- Ethnicity (African Americans are more likely to die of a stroke)
- Obesity
- History of prior stroke or transient ischemic attack (occurs when blood flow to a part of the brain stops for a brief time)
Stroke risk is also higher in:
- People who have heart disease or poor blood flow in their legs caused by narrowed arteries
- People who have unhealthy lifestyle habits such as smoking, excessive use of alcohol, use recreational drugs, a high-fat diet, or lack of exercise
- People who have a hereditary tendency to develop blood clots
- Women who take birth control pills (especially those who smoke and are older than 35)
- Women who are pregnant have an increased risk while pregnant
- Women who take hormone replacement therapy
- Patent foramen ovale (PFO), a hole between the left and right atria (upper chambers) of the heart
Symptoms
Symptoms of stroke depend on which part of the brain is damaged. In some cases, a person may not know that a stroke has occurred.
Most of the time, symptoms develop suddenly and without warning. But symptoms may occur on and off for the first day or two. Symptoms are usually most severe when the stroke first happens, but they may slowly get worse.
A headache may occur if the stroke is caused by bleeding in the brain. The headache:
- Starts suddenly and may be severe
- May be worse when you are lying flat
- May wake you up from sleep
- May get worse when you change positions or when you bend, strain, or cough
Other symptoms depend on how severe the stroke is, and what part of the brain is affected. Symptoms may include:
- Change in alertness (including sleepiness, unconsciousness, and coma)
- Changes in hearing or taste
- Changes that affect touch and the ability to feel pain, pressure, or different temperatures
- Confusion or loss of memory
- Problems swallowing
- Problems writing or reading
- Dizziness or abnormal feeling of movement (vertigo)
- Eyesight problems, such as decreased vision, double vision, or total loss of vision
- Lack of control over the bladder or bowels
- Loss of balance or coordination, or trouble walking
- Muscle weakness in the face, arm, or leg (usually just on one side)
- Numbness or tingling on one side of the body
- Personality, mood, or emotional changes
- Trouble speaking or understanding others who are speaking
Exams and Tests
Your health care provider will do a physical exam to:
- Check for problems with vision, movement, feeling, reflexes, understanding, and speaking. Your provider and nurses will repeat this exam over time to see if your stroke is getting worse or improving.
- Listen to the carotid arteries in the neck with a stethoscope for an abnormal sound, called a bruit, which is caused by abnormal blood flow.
- Check for high blood pressure and an irregular heartbeat.
You may have the following tests to help find the type, location, and cause of the stroke and rule out other problems:
- CT scan of the brain to determine if there is any bleeding
- MRI of the brain to determine the location of the stroke
- Angiogram of the head to look for a blood vessel that is blocked or bleeding
- Carotid duplex (ultrasound) to see if the carotid arteries in your neck have narrowed
- Echocardiogram to see if the stroke could have been caused by a blood clot from the heart
- Magnetic resonance angiography (MRA) or CT angiography to check for abnormal blood vessels in the brain
Other tests include:
- Blood tests
- Electroencephalogram (EEG) to determine if there are seizures
- Electrocardiogram (ECG) and heart rhythm monitoring
Treatment
A stroke is a medical emergency. Quick treatment is needed. Call 911 or the local emergency number right away or seek urgent medical care at the first signs of a stroke.
People who are having stroke symptoms need to get to a hospital as quickly as possible.
- If the stroke is caused by a blood clot, a clot-busting medicine may be given to dissolve the clot.
- To be effective, this treatment must be started within 4 1/2 hours of when the symptoms first started. However, the sooner this treatment is started, the better the chance of a good outcome.
- Endovascular thrombectomy may be needed. This is when a catheter is inserted into your arteries. Dye is injected while images of your brain's blood vessels are reviewed. A clot, if found, could be removed through the catheter.
Other treatments given in the hospital depend on the cause of the stroke. These may include:
- Blood thinners such as heparin, warfarin (Coumadin), direct acting oral anticoagulants (DOACs), aspirin, or clopidogrel (Plavix)
- Medicine to control risk factors, such as high blood pressure, diabetes, and high cholesterol
- Special procedures or surgery to relieve symptoms or prevent more strokes
- Nutrients and fluids
Physical therapy, occupational therapy, speech therapy, and swallowing therapy will all begin in the hospital. If the person has severe swallowing problems, a feeding tube in the stomach (gastrostomy tube) will likely be needed.
The goal of treatment after a stroke is to help you recover as much function as possible and prevent future strokes.
Recovery from your stroke will begin while you are still in the hospital or at a rehabilitation center. It will continue when you go home from the hospital or center. Be sure to follow up with your provider after you go home.
Support Groups
More information and support for people with stroke and their families can be found on the American Stroke Association website --
Outlook (Prognosis)
How well a person does after a stroke depends on:
- The type of stroke
- How much brain tissue is damaged
- What body functions have been affected
- How quickly treatment is given
Problems moving, thinking, and talking often start to improve in the days to weeks after a stroke.
Many people develop depression after a stroke. This can slow down recovery but is also a very treatable complication of a stroke.
Many people who have had a stroke will keep improving in the months or years after their stroke.
Over half of people who have a stroke are able to function and live at home. Others are not able to care for themselves.
If treatment with clot-busting medicines is successful, the symptoms of a stroke may go away. However, people often do not get to the hospital soon enough to receive these medicines, or they cannot take these medicines because of a health condition.
People who have a stroke from a blood clot (ischemic stroke) have a better chance of surviving than those who have a stroke from bleeding in the brain (hemorrhagic stroke).
The risk for a second stroke is highest during the weeks or months after the first stroke. The risk begins to decrease after this period.
When to Contact a Medical Professional
Stroke is a medical emergency that needs to be treated right away. The acronym F.A.S.T. is an easy way to remember signs of stroke and what to do if you think a stroke has occurred. The most important action to take is to call 911 or the local emergency number right away for emergency assistance.
F.A.S.T. stands for:
- FACE. Ask the person to smile. Check if one side of the face droops.
- ARMS. Ask the person to raise both arms. See if one arm drifts downward.
- SPEECH. Ask the person to repeat a simple sentence. Check if words are slurred and if the sentence is repeated correctly.
- TIME. If a person shows any of these symptoms, time is essential. It is important to get to the hospital as quickly as possible. Call 911 or the local emergency number. Act F.A.S.T.
Prevention
Reducing your stroke risk factors lessens your chance of having a stroke.
References
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Version Info
Last reviewed on: 4/29/2023
Reviewed by: Joseph V. Campellone, MD, Department of Neurology, Cooper Medical School of Rowan University, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
