- Most common type of stroke
- Symptoms may occur over minutes to hours, or may occur suddenly
- Often have warning signs, such as weakness or numbness on one side of the body, problems with speech and language, vision or balance
- Often occurs at night or first thing in the morning
An ischemic stroke occurs because of the lack of blood flow to an area of the brain. The stroke occurs because the blood (along with oxygen and nutrients) is not able to reach a certain area of the brain. This type of stroke usually occurs because of a blood clot blocking the flow of blood. There are two ways that this may occur:
i. Cerebral Thrombosis: This is a blood clot that forms in the brain. It is one of the most common causes of stroke. It occurs when the blood flow is blocked off by a clot that forms along the blood vessel wall. A thrombus (or clot) may also form in any of the four neck arteries that carry blood from the heart to the brain.
ii. Cerebral Embolic: This is a blood clot that travels in the bloodstream to the brain or to the main arteries leading to the brain. This kind of clot may get stuck in a blood vessel that is too small to pass through, blocking it and causing a stroke.