Table of Contents
Stroke Warning Signs
Treatable Risk Factors
How a CVA is Diagnosed
Emergency and Rehabilitation
Prevention and Prognosis
Effects of Stroke
Common Problems and Complications
Cost Of Stroke to the United States
Final Data for 2000
A cerebrovascular accident more commonly known as a stroke or brain attack is the term used to describe the sudden death of brain cells in a localized area due to inadequate blood flow. In order to woke the brain needs a constant supply of oxygen and nutrients. This supply is carried to the brain by blood through the arteries. If part of the brain is deprived of blood for longer than a few seconds brain cells can die. A stroke causes loss of function, sometimes permanently, in the part of the body that is controlled by the damaged part of the brain.
A stroke occurs when blood vessels in the brain burst spilling blood into the space surrounding brain cells, or when the blood supply to part of the brain is blocked thus a stroke is known as a cerebrovascular accident (¡§cerebro¡¨ refers to a part of the brain ¡§vascular¡¨ refers to the blood vessels and arteries.) In the same way that a person suffering a loss of blood flow to the heart is said to be having a heart attack, a person with a loss of blood flow to the brain or sudden bleeding in the brain can be said to be having a ¡§brain attack.¡¨
Blood flow to the brain tissue can be hampered in two ways, one the vessel ruptures, causing blood to leak into the brain. Hemorrhagic is the term used to describe bleeding into the brain or the spaces surrounding the brain. In the second the vessel clogs within Ischemic is the term used to describe the blockage of blood flow and loss of oxygen and nutrients for brain cells.
Blood clots are the most common cause of artery blockage. The process of clotting is necessary and beneficial through out the body because it stops bleeding and allows repair of damaged areas of arteries or veins. However when blood clots develop in the wrong place within the artery they can cause devastating injury by interfering with the normal flow of blood. Clots most often form due to Atherosclerosis. In Atherosclerosis cholesterol containing fatty deposits (plaques) build up over time on the inside of the artery walls. This accumulation narrows, hardens, and roughens the inside surface of the arteries. Turbulent blood flow around deposits of plaques trigger clot development. Ischemic Strokes
A Ischemic stroke occurs when a blood clot blocks an artery either in the brain itself or in the neck. These blockages stem from three conditions; the formation of a clot within a blood vessel of the brain or neck, called Thrombotic; The movement of a clot from another part of the body such as the heart to the neck or brain called embolism; or a severe narrowing of an artery in or leading to the brain, called stenosis.
Thrombotic stroke occurs when a blood clot forms in one of the cerebral arteries that stays attached to the artery wall until it grows large enough to block blood flow.Cerebral Thrombus occurs most often at night, or early in the morning. In most instancies the underlying cause is Atherosclerosis. Cerebral thrombosis is often preceded by a transient ischemic attack, or TIA, sometimes called a ¡§mini-stroke.¡¨ In a TIA, blood flow is temporarily interrupted, causing short lived stroke like symptoms.This kind of Ischemic stroke accounts for 60% of a stroke cases.
Embolic stroke is another common form of Ischemic stroke. It can occur when a clot, or small piece of plaque formed elsewhere in the circulatory system breaks free.This free roaming clot travels through the bloodstream until it reaches vessels too small to let it pass. This kind of stroke accounts for 20% of all...
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