What Is a Stroke?
Stroke is a medical emergency and a leading cause of death in the U.S. It occurs when a blood vessel in the brain bursts or, more commonly, when a blockage develops. Without treatment, cells in the brain quickly begin to die. The result can be serious disability or death. If a loved one is having stroke symptoms, seek emergency medical attention without delay.
Stroke Symptoms
Signs of a stroke may include:
 |
| side effect of stroke |
- Sudden numbness or weakness of the body, especially on one side.
- Sudden vision changes in one or both eyes, or difficulty swallowing.
- Sudden, severe headache with unknown cause.
- Sudden problems with dizziness, walking, or balance.
- Sudden confusion, difficulty speaking or understanding others.
Stroke Test: Talk, Wave, Smile
The F.A.S.T. test helps spot symptoms of stroke. It stands for:Face. Ask for a smile. Does one side droop?
Arms. When raised, does one side drift down?
Speech. Can the person repeat a simple sentence? Does he or she have trouble or slur words?
Time. Time is critical. Go to hospital immediately if any symptoms are present.
Stroke: Time = Brain Damage
Every second counts when seeking treatment for a stroke. When deprived of oxygen, brain cells begin dying within minutes. There are clot-busting drugs that can curb brain damage, but they need to be used within three hours -- up to 4.5 hours in some people -- of the initial stroke symptoms. Once brain tissue has died, the body parts controlled by that area won't work properly. This is why stroke is a top cause of long-term disability.
Diagnosing a Stroke
When
someone with stroke symptoms arrives in the ER, the first step is to
determine which type of stroke is occurring. There are two main types
and they are not treated the same way. A CT scan can help doctors
determine whether the symptoms are coming from a blocked blood vessel or
a bleeding vessel. Additional tests may also be used to find the
location of a blood clot or bleeding within the brain.
Ischemic Stroke
The most common type of stroke is known as an ischemic stroke. Nearly nine out of 10 strokes fall into this category. The culprit is a blood clot that obstructs a blood vessel inside the brain. The clot may develop on the spot or travel through the blood from elsewhere in the body.
Hemorrhagic Stroke
Hemorrhagic
strokes are less common but far more likely to be fatal. They occur
when a weakened blood vessel in the brain bursts. The result is bleeding
inside the brain that can be difficult to stop.
'Mini-Stroke' (TIA)
A
transient ischemic attack, often called a "mini-stroke," is more like a
close call. Blood flow is temporarily impaired to part of the brain,
causing symptoms similar to an actual stroke. When the blood flows
again, the symptoms disappear. A TIA is a warning sign that a stroke may
happen soon. It's critical to seek emergency medical help if you think
you've had a TIA. There are therapies to reduce the risk of stroke.What Causes a Stroke
A
common cause of stroke is atherosclerosis -- hardening of the arteries.
Plaque made of fat, cholesterol, calcium, and other substances builds
up in the arteries, leaving less space for blood to flow. A blood clot
may lodge in this narrow space and cause an ischemic stroke.
Atherosclerosis also makes it easier for a clot to form. Hemorrhagic
strokes often result from uncontrolled high blood pressure that causes a
weakened artery to burst.
Risk Factors: Chronic Conditions
Certain chronic conditions increase your risk of stroke. These include:- High blood pressure
- High cholesterol
- Diabetes
- Obesity
Risk Factors: Behaviors
Certain behaviors also increase the risk of stroke:- Smoking
- Getting too little exercise
- Heavy use of alcohol
Risk Factors: Diet
A
poor diet may increase the risk for stroke in a few significant ways.
Eating too much fat and cholesterol can lead to arteries that are
narrowed by plaque. Too much salt may contribute to high blood pressure.
And too many calories can lead to obesity. A diet high in fruits,
vegetables, whole grains, and fish may help lower stroke risk.Risk Factors You Can't Control
Some
stroke risk factors are beyond your control, such as getting older or
having a family history of strokes. Gender plays a role, too, with men
being more likely to have a stroke. However, more stroke deaths occur in
women. Finally, race is an important risk factor. African-Americans,
Native Americans, and Alaskan Natives are at greater risk compared to
people of other ethnicities.Stroke: Emergency Treatment
Stroke: Long-Term Damage
Whether
a stroke causes long-term damage depends on its severity and how
quickly treatment stabilizes the brain. The type of damage depends on
where in the brain the stroke occurs. Common problems after a stroke
include numbness and/or weakness in the arms or legs, difficulty
walking, vision problems, trouble swallowing, and problems with speech
and comprehension. These problems can be permanent, but many people
regain most of their abilities.Stroke Rehab: Speech Therapy
Rehabilitation
is the centerpiece of the stroke recovery process. It helps patients
regain lost skills and learn to compensate for damage that can't be
undone. The goal is to help restore as much independence as possible.
For people who have trouble speaking, speech and language therapy is
essential. A speech therapist can also help patients who have trouble
swallowing.Stroke Rehab: Physical Therapy
Muscle
weakness, as well as balance problems, are very common after a stroke.
This can interfere with walking and other daily activities. Physical
therapy is an effective way to regain strength, balance, and
coordination. For fine motor skills, such as using a knife and fork,
writing, and buttoning a shirt, occupational therapy can help.Stroke Rehab: Talk Therapy
Stroke Prevention: Lifestyle
People who have had a stroke or TIA can take steps to prevent a recurrence:- Quit smoking.
- Exercise and maintain a healthy weight.
- Limit alcohol and salt intake.
- Eat a healthier diet with more veggies, fish, and whole grains.
Stroke Prevention: Medications
For people with a high risk of stroke, doctors often recommend medications to lower this risk. Anti-platelet drugs, including aspirin, keep platelets in the blood from sticking together and forming clots. Anti-clotting drugs, such as warfarin, may be needed to help ward off stroke in some patients. Finally, if you have high blood pressure, your doctor will prescribe medication to lower it.
Stroke Prevention: Surgery
In some cases, a stroke results from a narrowed carotid artery -- the blood vessels that travel up each side of the neck to bring blood to the brain. People who have had a mild stroke or TIA due to this problem may benefit from surgery known as carotid endarterectomy. This procedure removes plaque from the lining of the carotid arteries and can help prevent additional strokes.
Stroke Prevention: Balloon and Stent
Doctors can also treat a clogged carotid artery without major surgery in some cases. The procedure, called angioplasty, involves temporarily inserting a catheter into the artery and inflating a tiny balloon to widen the area that is narrowed by plaque. A metal tube, called a stent, can be inserted and left in place to keep the artery open.
Life After a Stroke
Many people who have a stroke regain the ability to take care of themselves if they follow their rehabilitation plan. Those who get clot-busting drugs soon enough may recover completely. And those who experience disability can often learn to function independently through therapy. It has been shown that 3% to 4% of all patients that experience a stroke will subsequently experience a second stroke.
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