A mini-stroke can last only a few minutes, but it can be an important warning about what may happen next.
Known medically as a transient ischemic attack, or TIA, it happens when blood flow to part of the brain is temporarily interrupted.
The symptoms can look exactly like those of a stroke and then disappear. A person may suddenly have weakness or numbness on one side, trouble speaking, difficulty understanding others, vision changes, dizziness or problems with balance.
In the past, a TIA was often described as a stroke that leaves no permanent damage. Doctors now take it very seriously because symptoms that disappear quickly can still signal a high risk of a larger stroke, particularly in the following days.
A common cause is a blood clot that temporarily blocks an artery carrying blood to the brain. The clot may form in a blood vessel or travel from another part of the body before becoming briefly stuck in a smaller artery.
Fatty material building up inside arteries can make this more likely. This process, called atherosclerosis, causes arteries to become narrower and less healthy and can create conditions in which blood clots form.
The arteries in the neck that supply the brain are especially important. If plaque develops there, small pieces of material or clots can break away and travel toward the brain, temporarily cutting off its blood supply.
The heart can also be the source of a clot. One important risk factor is atrial fibrillation, an irregular heartbeat that can allow blood to collect inside the heart and form clots that may later travel to the brain.
High blood pressure is another major risk factor for both TIA and stroke. Over time, excessive pressure can damage artery walls and contribute to changes that make blocked or damaged blood vessels more likely.
Diabetes can also harm blood vessels, while unhealthy cholesterol levels can encourage plaque to build up. Smoking adds further risk because it damages the blood vessels and makes cardiovascular disease more likely.
Age and family history are risks that people cannot change, but many other factors can be managed. Controlling blood pressure, diabetes and cholesterol, avoiding smoking, exercising regularly and following a balanced diet can all help reduce stroke risk.
Some people who have had a TIA may need medicines to prevent blood clots or lower cholesterol. People with atrial fibrillation may be prescribed blood-thinning medicine, while severe narrowing of certain arteries may require other treatments.
The most important step is recognizing possible stroke symptoms and getting emergency medical care immediately. People should not wait to see whether symptoms disappear, because at the beginning there is no reliable way to know whether the event is a TIA or a full stroke.
A useful way to remember common stroke signs is FAST: face drooping, arm weakness, speech difficulty and time to call emergency services. Other sudden neurological symptoms, including major vision or balance changes, also need urgent assessment.
Research published in medical journals including Stroke and JAMA has shown that people face an increased risk of stroke after a TIA, while rapid medical assessment and preventive treatment can substantially reduce that risk. Modern TIA care therefore focuses on finding the cause quickly rather than simply waiting for symptoms to return.
A mini-stroke is not something to dismiss because the person feels normal again. It can provide a valuable opportunity to identify hidden problems in the heart or blood vessels and begin treatment before a disabling or life-threatening stroke occurs.
If you care about stroke, please read studies that diets high in flavonoids could help reduce stroke risk, and MIND diet could slow down cognitive decline after stroke.
For more health information, please see recent studies about antioxidants that could help reduce the risk of dementia, and tea and coffee may help lower your risk of stroke, dementia.
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