The Cause Stroke

Stroke that broke the flow of blood through the brain and brain tissue damage. There are two main types of stroke. The most common type of ischemic stroke - results from a blockage in the arteries. The other type of hemorrhagic stroke occurs when a blood vessel leakage or rupture. Transient ischemia (TIA) - sometimes called a ministroke temporarily interrupt blood flow through the brain.

 

Nearly 90% of stroke ischemic brain stroke is ischemic stroke.

They occur when the brain arteries narrowed or blocked, causing reduced blood flow (ischemia). Lack of blood flow deprivation of oxygen and nutrients to the brain cells, and the cells can begin to die within minutes. Ischemic stroke is the most popular:

Thrombotic stroke. This type of stroke occurs when a blood clot (thrombus) forms in one of the arteries that supply blood to the brain. Blood clots usually form in areas damaged by atherosclerosis - the disease in which the arteries clogged by fat (array). This process can occur within one of the two carotid arteries - carotid artery carries blood to the brain, as well as in other arteries of the neck or brain.

Embolic stroke. C thanks stroke embolism occurs when a blood clot or other debris in the form of a brain blood vessel - often in the heart - complaints of cerebral artery stenosis. This type of blood clot is called an embolus. It is usually caused by irregular heart's two upper chambers (atrial fibrillation). Abnormal heart rhythms that can lead to blood clots in the heart and blood clots forming and go to other places in the body.

Hemorrhagic stroke. Hemorrhage is the medical term for bleeding. Hemorrhagic stroke occurs when a blood vessel in the brain leaks or breaks. Cerebral hemorrhage can result from a number of conditions affecting the blood vessels, including high blood pressure, uncontrolled (hypertension) and weakness in the blood vessel (aneurysm). A less common cause hemorrhagic fevers caused rupture arteriovenous malformation (AVM) - abnormal tangle of blood vessels thin at birth. There are two types of hemorrhagic stroke:

In cerebral hemorrhage. In this type of stroke, a blood vessel in the brain bursts and spills into the surrounding brain tissue, damaging cells. Brain cells leak areas deprived of blood and also damaged. Hypertension is the most common cause of this type of hemorrhagic stroke. Over time, high blood pressure can cause small arteries within the brain become brittle and prone to cracking and breaking.

Subarachnoid hemorrhage. Stroke type, the blood flow in an artery begins on or near the surface of the brain and overflow into the space between the surface of the brain and skull. Bleeding is usually signaled by a sudden severe headache. This type of stroke is often caused by aneurysm rupture, can develop with age or is present from birth. After bleeding, the blood vessels in the brain can expand and narrow erratically (vasospasm), damage brain cells by continuing to restrict blood flow to parts of the brain.

Gusts transient ischemia (TIA)

Episodes of transient ischemia (TIA) - sometimes called ministroke is a set of symptoms similar to having a stroke. Causes of transient ischemia is temporarily reduced blood supply to part of the brain. TIA less than five minutes.

Like a stroke ischemia, TIA occurs when a blood clot or piece of blocking the flow of blood to part of the brain. But unlike stroke, which include the lack of blood supply lasting and permanent tissue damage, TIA does not leave a lasting impact for temporary blockage.

Seek emergency care even if the symptoms seem obvious. If you have had a TIA, that is capable of partially blocked or narrowed arteries leading to the brain, leading to the risk of a full stroke can cause permanent damage later. And it's impossible to know if you have a stroke or TIA based on the symptoms. Up to half of people with symptoms appear really have a stroke caused brain damage.