Saturday, December 5, 2015

Types of Stroke

Stroke is a loss of brain function caused by the interruption of blood flow to the brain area. If blood flow is stopped for more than a few seconds, the cells of brain tissue that is not getting the nutrients and oxygen can die and cause permanent damage to brain function.
There are two main types of stroke:

1. Ischemic Stroke

Ischemic stroke occurs when a blood vessel that supplies blood to the brain is blocked. Type of stroke is the most common (almost 90% of strokes are ischemic).

Ischemic stroke underlying condition is the accumulation of fat that lines the walls of blood vessels (called atherosclerosis). Cholesterol, homocysteine and other substances can be attached to the walls of arteries, forming a sticky substance called plaque. Over time, plaque accumulates. This often makes it difficult blood flowing properly and cause a blood clot (thrombus).

Ischemic stroke is distinguished by the cause of clogged arteries:

Thrombotic strokes. Blockages caused by thrombus develops in the arteries of the brain is already very narrow.
Embolic stroke. A blockage caused by a thrombus, an air bubble or fat fractions (embolism) are formed in other parts of the body such as the heart and the aorta in the chest and neck, which is carried by the flow of blood to the brain. Heart disorder called atrial fibrillation can create conditions in which the thrombus formed in the heart pumping and circulation to the brain.

2. hemorrhagic stroke.

Hemorrhagic strokes are caused by blood vessels leak or rupture in or around the brain that block the blood supply to the brain tissue in question. In addition, the blood flooded and compress surrounding brain tissue so as to disturb or shut off function.

Two types of hemorrhagic stroke:

Intracerebral hemorrhage. Intracerebral hemorrhage is bleeding in the brain caused by trauma (brain injury) or abnormal blood vessels (aneurysm or angioma). If not caused by one of these conditions, most often caused by chronic high blood pressure. Intracerebral hemorrhage accounts for about 10% of all strokes, but it has the highest percentage cause of death from stroke.
Subarachnoid hemorrhage. Subarachnoid hemorrhage is bleeding in the subarachnoid space, the space between the inner layer (Pia mater) and middle layer (arachnoid mater) of tissue lining of the brain (meninges). The most common cause is the rupture of a bulge (aneurysm) in the arteries. Subarachnoid hemorrhage is a serious medical emergency that can cause permanent disability or death. Stroke is also the only type of stroke is more common in women than in men.


Minor stroke or medically known as a transient ischemic attack (TIA) occurs when the oxygen supply to a specific part of the brain is blocked for a while, then returned to normal. The obstruction is usually caused by narrowing of the arteries of the brain due to atherosclerosis or small blood clots that brought in from elsewhere in the body and clog the arteries of the brain.

Most minor stroke lasted less than ten minutes the symptoms are temporary. If continued in the 24 hours or so then categorized as ordinary stroke


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