Stroke

Stroke  is a condition that occurs when blood supply to a part of the brain was suddenly interrupted. In brain tissue, lack of blood flow causes a series of bio-chemical reactions, which can damage or kill brain cells. The death of brain tissue can cause loss of function that is controlled by the network. Stroke is the third leading cause of death in the United States and many industrialized countries in Europe (Jauch, 2005). If you can be saved, sometimes the patient experienced paralysis in his limbs, loss of memory or verbal skills. To underline the seriousness of this stroke, recent years have been increasingly popular term brain attack. This term is in keeping with the terms already known, "heart attack". stroke occurs due to blocked blood vessels branch by embolism. embolism can be a cholesterol or may be air

Stroke was divided into two types of ischemic stroke and stroke hemorragik. In ischemic stroke, blood flow to the brain stops because atherosclerosis (cholesterol buildup in blood vessel walls) or a blood clot that has clogged the blood vessels to the brain. Most of the patients or 83% experienced this type of stroke.

In hemorragik stroke, broken blood vessels that block normal blood flow and blood seeped into an area in the brain and damage it. Nearly 70 percent of cases of Acute hemorrhagic stroke occurs in hypertension.
In ischemic stroke, blockage can occur along the arterial route leading to the brain. Blood to the brain is supplied by two arteria the internal carotid and two vertebral arteries. These arteries are branches of the aortic arch heart.
An atheroma (fatty deposits) may form in the carotid arteries causing reduced blood flow. This situation is very serious because each carotid artery normally provides blood to most of the brain. Fat deposition could also separated from the artery walls and flows in the blood, clogging arteries and smaller.
Carotid arteries and the vertebral artery and its ramifications could be blocked due to blood clots that come from elsewhere, such as the heart or a valve. This kind of stroke called a cerebral embolism (embolism = occlusion, cerebral blood vessels of the brain =) The most frequently occurs in patients who had heart surgery and people with heart valve abnormalities or heart rhythm disturbances (especially atrial fibrillation).
Fat emboli rarely cause stroke. Fat emboli formed when fat from a broken bone marrow released into the bloodstream and eventually joined in an artery.
Stroke can also occur when an infection causes inflammation or narrowing of blood vessels leading to the brain. The drugs (eg cocaine and amphetamines) can also narrow the blood vessels in the brain and cause stroke.
Blood pressure drops suddenly can cause reduced blood flow to the brain, which usually causes a person to faint. Stroke can occur if the low blood pressure is very heavy and chronic. This happens if one gets a lot of blood loss due to injury or surgery, heart attack or abnormal heart rhythms.