Stroke (also known as Brain Attack) occurs when blood supply to the brain is affected due to either blockage or leakage (or both blockage and leakage) of a blood vessel responsible for supplying or draining blood to and from the brain, thereby, causing brain damage leading to difficulty in movements, sensation, speaking, vision etc. or at times to death.
Types of stroke
Ischemic Stroke:In India about 70-75% of all strokes are ischemic, in which blood flow to the brain is blocked by blood clots or fatty deposits (also known as plaque) in blood vessel linings.
Hemorrhagic Stroke:It occurs when a blood vessel leaks in the brain. Blood accumulates and compresses the surrounding brain tissue. This is also called ‘Brain hemorrhage.
Intracerebral hemorrhage: It is the most common type of hemorrhagic stroke. It occurs when an artery in the brain leaks, flooding the surrounding tissue with blood.
Subarachnoid hemorrhage: It is bleeding in the area between the brain and its covering consisting of layers of tissue.
Transient ischemic attack (TIA) is a "warning stroke" or a "mini-stroke" that results in no lasting damage. Recognizing and treating TIAs immediately can reduce your risk of a major stroke.
The content of this module has been validated by Dr Kameshwar Prasad, Head, Department of Neurology on 26th March 2015.
The five most common symptoms of stroke are
· Weakness or Numbness of the face, arm, or leg.
· Confusion or trouble speaking or understanding others.
· Difficulty in vision
· Difficulty in walking or loss of balance or coordination.
· Severe headache with unknown cause.