Submitted by Thiruvelan on Thu, 06/24/2010

A stroke occurs when a part of brain suddenly not receiving the blood supply or a sudden bleeding in the brain by a blood vessel bursts.

Stroke or Brain Attack

A stroke or brain attack develops when a blood clot blocks an artery that supplies oxygen-rich blood to the brain or a blood vessel break, interrupting blood flow to an area of the brain. Thus, brain cells do not receive oxygen and nutrient-rich blood, begins to die, and causes brain damage.

Stroke classification

Classify stroke or brain attack into two types; they are Ischemic stroke and Hemorrhagic stroke based upon the way it has to happen.

Ischemic Stroke - When there is a blockage in an artery supplying blood to the brain, suddenly decreasing or stopping blood flow and ultimately causing a brain infarction. Blood clots are the most common cause of artery blockage and brain infarction.

Hemorrhagic Stroke - In a healthy individual, neurons do not come into direct contact with blood. Neurons receive nutrients and oxygen via thin walls of cerebral capillaries. When arteries in the brain break open and spill blood, can affect chemical balance that is necessary for the neurons to function normally called as hemorrhagic stroke.

Transient Ischemic Attacks - Otherwise, known as mini-stroke; it starts just like a stroke but resolves leaving no noticeable symptoms or deficits.

When brain cells die during a stroke, functions controlled by that area of the brain are affected. These functions include speech, movement, and memory.

One who has a minor stroke may have only lesser problems of arm or leg weakness. People who have major strokes may be paralyzed on one side or lose their ability to speak.