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Ischaemic stroke: occurs when the arrival of the blood to an area of the brain is altered due to a blockage in a cerebral or pre-cerebral artery. This causes the brain cells in the affected area to die from lack of oxygen (ischaemia).
This blockage can have various causes. It may be due to narrowing or blockage of arteries leading to the brain because cholesterol is deposited in the arterial wall. This process is known as atherosclerosis or atheroma. The blockage of a cerebral artery may also be due to a clot from another part of the body (for example, the heart, in which case it’s known as a cerebral embolism).
