What is brain stroke?
A stroke occurs if the flow of oxygen-rich blood to a portion of the brain is blocked. Without oxygen, brain cells start to die after a few minutes. Sudden bleeding in the brain also can cause a stroke if it damages brain cells. STROKE is the third leading cause of death in the United States and Hawaii, and a leading cause of serious, long-term disability. On average, one person in the U.S. has a stroke every 40 seconds and one person dies from stroke every four minutes.
Three kinds of brain stroke.
There are three types of brain stroke.
About 80 percent of strokes are ischemic. An ischemic stroke is most frequently caused by a blood clot that lodges in an artery and blocks the flow of blood to a part of the brain. High blood pressure is the most important risk factor for ischemic stroke.
A hemorrhagic stroke occurs when a blood vessel ruptures within the brain. About 15 to 20 percent of strokes are hemorrhagic. There are two kinds of stroke due to ruptured blood vessels: subarachnoid hemorrhage due to ruptured aneurysms and intracerebral hemorrhage due to ruptured blood vessels. In both types of hemorrhagic stroke, blood flow is disrupted to part of the brain.
Transient Ischemic Strokes (TIA)
About 10 percent of strokes follow incidents called transient ischemic attacks, or TIAs. A TIA is a “mini-stroke” that occurs when a blood clot blocks an artery for a short time. TIAs may occur days, weeks or months before the onset of a stroke. The symptoms of a TIA are like the warning signs of a stroke, but they usually last only a few minutes. TIAs are strong predictors of stroke risk. Don’t ignore them. Call 9-1-1 or seek emergency medical attention immediately.
SIGNS & SYMPTOMS
- Sudden numbness or weakness of face, arm, or leg, especially on one side of the body
- Sudden confusion or trouble speaking or understanding speech
- Sudden trouble seeing in one or both eyes
- Sudden trouble walking, dizziness, or loss of balance or coordination
- Sudden severe headache with no known cause