Stroke or "Brain attack" occurs due to interruption or obstruction of blood flow to the brain. Brain cells (neurons) begin to die within few minutes, as they do not receive oxygen and nutrients.
Types of stroke
- Ischemic Stroke: It is caused by a blockage of blood vessels in the neck or brain, most often caused by blood clot or severe narrowing of the blood vessels.
- Hemorrhagic Stroke: It is caused by a blood vessel in the brain that break and bleeds into the brain. Blood accumulates and compresses the surrounding brain tissue. This is also called 'Brain hemorrhage'
Image courtesy : National Stroke Association
- Intracerebral haemorrhage is the most common type of haemorrhagic stroke. It occurs when an artery in the brain leaks, flooding the surrounding tissue with blood.
- Subarachnoid haemorrhage is bleeding in the area between the brain and its covering consisting of layers of tissue.