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WHAT IS A STROKE? When the blood supply to the brain is disturbed in some way and brain cells are starved of oxygen causing some cells to die and leaving other cells damaged or dead it's call a STROKE.
Most strokes happen when a blood clot blocks one of the arteries (blood vessels) that carries blood to the brain. Brain cells are starved of oxygen causing some cells to die and leaving other cells damaged when the blood supply to the brain was disturbed in some way. This type of stroke is called an inschaemic stroke.
Transient ischaemic attack (TIA) is a short-term stroke that lasts for less than 24 hours. The oxygen supply to the brain is restored quickly, and symptoms of the stroke disappear completely. A transient stroke needs prompt medical attention as it is a warning of serious risk of a major stroke.
What causes a stroke?
The blockage of an artery in the brain by a clot (thrombosis) is the most common cause of a stroke. The part of the brain that is supplied by the clotted blood vessel is then deprived of blood and oxygen. The cells of that part of the brain die as a result. Typically, a clot forms in a small blood vessel within the brain that has been previously narrowed due to the long-term, damaging effects of high blood pressure (hypertension) or diabetes. The resulting strokes are called lacunar strokes because they look like little lakes. In other situations, usually because of hardening of the arteries (atherosclerosis), a blood clot can obstruct a larger vessel going to the brain, such as the carotid artery in the neck.
Another type of stroke occurs when a blood clot or a piece of atherosclerotic plaque (cholesterol and calcium deposits on the wall of the inside of the heart or artery) breaks loose, travels through open arteries, and lodges in an artery of the brain. When this happens, the flow of oxygen-rich blood to the brain is blocked and a stroke occurs. This type of stroke is referred to as an embolic stroke. For example, a blood clot might originally form in the heart chamber as a result of an irregular heart rhythm, such as occurs in atrial fibrillation. Usually, these clots remain attached to the inner lining of the heart, but occasionally they can break off, travel through the blood stream, form a plug (embolism) in a brain artery, and cause a stroke. An embolism can also originate in a large artery (for example, the carotid artery, a major artery in the neck that supplies blood to the brain) and then travel downstream to clog a small artery within the brain.
A cerebral hemorrhage occurs when a blood vessel in the brain bursts and bleeds into the surrounding brain tissue. A cerebral hemorrhage (bleeding in the brain) can cause a stroke by depriving blood and oxygen to parts of the brain. The accumulation of blood from a cerebral hemorrhage can also press on parts of the brain and cause damage. A subarachnoid hemorrhage is caused by the rupture of a blood vessel that is usually located between the outside of the brain and the inside of the skull. The blood vessel at the point of rupture is often previously abnormal, such as from an aneurysm (an abnormal ballooning out of the wall of the vessel). Subarachnoid hemorrhages usually cause a sudden, severe headache and are often complicated by further neurological problems, such as paralysis, coma, and even death.
Overall, the most common risk factors for stroke are high blood pressure and increasing age. Diabetes and certain heart conditions, such as atrial fibrillation, are other common risk factors. When strokes occur in younger individuals (less than 50 years old), less common risk factors are often involved. These risk factors include drugs, such as cocaine or amphetamines, ruptured aneurysms, and inherited (genetic) predispositions to blood clotting. Another example of a genetic predisposition to stroke occurs in a rare condition called homocystinuria, in which there are excessive levels of the chemical homocystine in the body. Furthermore, scientists are trying to determine whether the non-hereditary occurrence of high levels of homocystine at any age can predispose to stroke. Another rare cause of stroke is vasculitis, a condition in which the blood vessels become inflamed. Finally, there appears to be a very slight increased occurrence of stroke in people with migraine headache.
What are the effects of a stroke?
People can be affected in quite different ways. This partly depends on which area of the brain is damaged, because different parts control different abilities such as speaking, memory, swallowing and moving. The most common signs of a stroke are weakness, paralysis or numbness of the arm and leg. Sometimes the people who have had stroke may be difficult to speak or understand.
What are the risk factors?
Age over than 40 should have an annual blood pressure check to maintain
the high blood pressure.
Smokers have double the risk of stroke as non-smokers.
The people who have Diabetes.
Too much alcohol increases the risk of a stroke.
Too much intake of oily food also increases the chance.
Heavy stress.
A stroke occurs when the blood supply to part of the brain is suddenly interrupted or when a blood vessel in the brain bursts, spilling blood into the spaces surrounding brain cells.
A stroke occurs when the blood supply to a part of your brain is interrupted or severely reduced, depriving brain tissue of oxygen and nutrients. Within a few minutes, brain cells begin to die.
Herbal Treatment Stroke Acupuncture
Stroke is a type of cardiovascular disease. It affects the arteries leading to and within the brain. A stroke occurs when a blood vessel that carries oxygen and nutrients to the brain is either blocked by a clot or bursts.
A stroke is the sudden death of brain cells due to a problem with the blood supply. When blood flow to the brain is impaired, oxygen and important nutrients cannot be delivered. The result is abnormal brain function.
A stroke occurs when a blood vessel (artery) that supplies blood to the brain bursts or is blocked by a blood clot. Within minutes, the nerve cells in that area of the brain are damaged, and they may die within a few hours.
A stroke is sometimes called a "brain attack." A stroke can injure the brain like a heart attack can injure the heart. A stroke occurs when part of the brain doesn't get the blood it needs.