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What is a transient ischemic attack (TIA)?
A transient ischemic attack (TIA) is a stroke. It is considered a “mini” or “warning” stroke. During a mini stroke, blood flow to your brain is blocked for a few minutes. The average amount of time is one minute. Most symptoms go away within 24 hours. That is far less than a major stroke. There is usually no long-term damage following a TIA. A mini stroke significantly increases your risk of a major stroke.
Symptoms of transient ischemic attack (TIA)
Mini stroke symptoms are similar to a major stroke. This includes:
- Weakness/loss of feeling in your face, arm, or leg
- Symptoms appear on one side of your body
- Difficulty smiling or speaking
- Sudden, severe headache
- Difficulty walking or balancing
What causes transient ischemic attack (TIA)?
The most common cause is a blood clot. This is same for a major stroke. Blood clots are caused by cholesterol buildup. As cholesterol blocks your arteries, it forms a blood clot. Eventually, the clot breaks free. The clot travels to your brain. That’s where the mini stroke occurs. Managing your cholesterol levels through diet, exercise, and medicine lowers your risk.
Other medical conditions can increase your chances of having a stroke. These include high blood pressure, diabetes, and obesity. Lifestyle changes can reduce the risk of stroke. This includes not smoking and limiting alcohol. Other risks include age, heredity, gender, and ethnicity. If you’ve had one stroke, you are at a higher risk of having another one.
How is transient ischemic attack (TIA) diagnosed?
It’s difficult to identify a mini from a major stroke as it’s happening. Self-awareness is important. Getting to a hospital or calling 911 also is important. That’s because treating a TIA or major stroke fast prevents further damage. A doctor will perform a physical exam. He or she will ask you about your medical history. This includes questions about other medical conditions and your lifestyle. A mini stroke only lasts minutes. You, a family member or friend should remember your symptoms. All tests and exams will happen after you have the mini stroke.
Your doctor will place a stethoscope on your chest and back. This is to listen for sounds of a heart murmur or irregular heartbeat. These sounds are common in someone who has hardening of the arteries. That is a risk factor for stroke. Your doctor also will look at your eyes. He or she is looking for tiny bits of cholesterol or bleeding at the back of your eye. This is another sign of stroke.
Certain imaging tests can diagnose a stroke. They include:
- Carotid ultrasonography
- CT (computerized tomography)
- CTA (computerized tomography angiography)
- MRI (magnetic resonance imaging)
- MRA (magnetic resonance angiography)
- TTE (transthoracic echocardiogram)
- TEE (transesophageal echocardiogram)
An arteriography can diagnose a mini stroke. This test allows your doctor to look at the arteries in your brain. The doctor will make a small incision (cut) near your groin (lower abdomen). He or she will insert a flexible tube attached to a camera into the incision. This will give your doctor the view he or she needs to make a diagnosis.
Transient ischemic attack (TIA) treatment
Most of the time, your body treats a mini stroke on its own. The blood clot quickly dissolves. A mini stroke still requires immediate attention. Go to an emergency room when you recognize symptoms. Time is critical in treating all strokes. The sooner you are treated, the better your recovery and outcome.
Treatment may include:
- Antiplatelet medicine. Antiplatelet medicines help prevent blood clots. They don’t allow certain cells in the blood (called platelets) to clump together. This reduces the risk of blockages in the coronary arteries that can lead to heart attack and stroke. They are sometimes prescribed along with aspirin therapy.
- Anticoagulants (blood thinners). Blood thinners don’t actually thin the blood. They decrease the ability of the blood to clot. This helps prevent clots from forming in the blood vessels. It also may prevent clots from becoming larger. Large clots can cause more serious problems.
Surgery is another treatment option. Surgery would open a clogged artery. You may need medicine and surgery. Endarterectomy surgery is necessary for people with a narrow neck artery. This surgery cleans fatty cholesterol from that artery.
Can transient ischemic attack (TIA) be prevented or avoided?
After a TIA, your doctor may want you to take aspirin. Aspirin can help keep your blood from forming clots that block your arteries. If taking low-dose aspirin is right for you, it is important to follow your doctor’s instructions. Your doctor may also prescribe a statin. Statins (also called HMG-CoA reductase inhibitors) slow down your body’s production of cholesterol. These drugs also remove cholesterol buildup from your arteries (blood vessels)
You also can reduce risk through healthy living and managing diseases that cause strokes. Maintain a healthy diet, exercise, don’t smoke, limit alcohol, and take your medicines. This is good advice whether you are at risk or not. See your doctor if you have a medical history, family history, or other risk factors. A mini stroke is a warning for a future, major stroke. Without lifestyle changes and medicine, a second mini stroke or major stroke can happen within 1 year of your first mini stroke. Even with healthy changes, there’s no guarantee you won’t have a stroke.
Living with transient ischemic attack (TIA)
TIA’s do not cause long-term damage (walking, talking). Anxiety and worry about another stroke is common. This is true even after making lifestyle changes and taking medicine. Teach yourself, your family and friends to recognize the signs of a stroke. The phrase FAST helps you remember the symptoms.
- F — Face. You can’t smile. Your face or mouth is drooping. This is limited to one side of your face.
- A — Arms. You can’t raise one or both arms.
- S — Speech. You can’t speak, repeat a simple phrase. Your speech is slurred.
- T — Time. Time is the most important factor in treating a stroke. Receiving treatment within 3 hours of your symptoms provides the best outcome and recovery.
Teach your family and friends the FAST rule in case you cannot communicate.
Questions to ask your doctor
- How much does family history increase your risk of stroke?
- Can medicines cause stroke?
- Can strobe lights cause a stroke?
- Can caffeine cause a stroke?
- What should I do if I am more than 3 hours from a hospital for treatment?
- What are the complications of an untreated stroke?
- Can I die from a mini stroke?
Copyright © American Academy of Family Physicians
This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject.