When brain cells die during a stroke, the capacity of the region of the brain are lost. These abilities include speech, movement and memory. How a stroke patient is affected depends on where the stroke occurs in the brain and to what extent the brain is damaged.
What causes a stroke?
The artery blockage in the brain by a blood clot (is called thrombus) is the main cause of stroke. The part of the brain that is full by the clotted blood vessel is then deprived of oxygen and blood. As a result of the deprived oxygen and blood, the cells of that part of the brain die. In general, a clot in small blood vessels of the brain has been reduced by several factors, including:
1. High blood pressure (hypertension),
2. High cholesterol,
What Are the Types of Stroke?
Embolic stroke may be occur when a blood clot or a piece of plaque (deposits of cholesterol and calcium in the inner wall of the arteries of the heart or unleashed), travels through open arteries, and present in an artery in the brain. If this happens, the flow of oxygen through blood to the brain is blocked and stroke occurs. This type of attack is called embolism. For example, a blood clot might originally in the abdomen after irregular heart rhythm, form, as in cases of atrial fibrillation. Generally, these clots remain attached to the inner wall of our heart, but sometimes it can break off, travel through the bloodstream, forming a plug (embolism) in an artery in the brain and cause stroke. An embolism can also come from one of the great arteries (eg carotid artery, a major artery of the neck providing blood to the brain), then downstream to clog a small artery in our brain.
A cerebral hemorrhage is another type of stroke, which occurs when a blood vessel in the brain rupture and bleeds into the surrounding tissue of our brain. A cerebral hemorrhage (bleeding inside the brain) can cause stroke by the extraction of blood and oxygen to parts of the brain.
Another rare cause of stroke is vasculitis, a disease in which inflammation of blood vessels.
It seems a very small increase in the incidence of stroke in patients with migraine. The mechanism for the treatment of migraine or vascular headaches includes constriction of blood vessels in the brain. Some episodes of migraine can mimic the same stroke with loss of function on one side or edge of vision or speech problems. In general, the symptoms such as headache disappear.