What is a Stroke?
A stroke is a sudden loss of brain function that occurs when the blood flow supplying oxygen to a part of the brain is interrupted. There are three major types of stroke: ischemic stroke which is caused by a lack of blood flow to the brain due to a blood clot; bleeding within the brain, and a rupture of an aneurysm in a blood vessel in the brain.
According to heartandstroke.ca these are some usual types of strokes :
- Ischemic stroke
- Transient ischemic attack (TIA)
- Hemorrhagic stroke
Most strokes are caused by a blockage or clot in a blood vessel in your brain. This is called an ischemic stroke. The blockage can be caused when a substance called plaque builds up on the inside wall of an artery. The blockage or clot grows as blood cells and fat cells stick to the plaque. Gradually, it grows big enough to block normal blood flow. The blockage or clot can form in an artery in your brain. Or, it can form in an artery in another part of your body and travel to the brain.
Transient ischemic attack
A transient ischemic attack (TIA) is caused by a small clot that briefly blocks an artery. It is sometimes called a mini-stroke or warning stroke. TIA symptoms might last only a few minutes or hours. No lasting damage occurs, but TIAs are an important warning that a more serious stroke may occur soon.
Hemorrhagic stroke is caused when an artery in the brain breaks open. The interrupted blood flow causes damage to your brain. High blood pressure makes arteries weak over time. It is a major cause of hemorrhagic stroke. Weak spots in the arteries called aneurysms can stretch too far and eventually burst.