Symptoms and signs
Ischemic stroke
If the blood supply to one part of the brain is decreased, it usually leads to the dysfunction of the brain tissue in the area. Then an ischemic stroke occurs. The following are four reasons why this might happen.
1. Thrombosis, which is the blood vessel obstruction by a locally formed blood clot.
2. Embolism, which is the blood vessel obstruction from elsewhere in the body, see below.
3. Systemic hypoperfusion, which is the general decrease in blood supply, e.g. in shock.
4. Venous thrombosis.
Stroke without a clear explanation is called “cryptogenic”, which means with a unknown origin; 30-40% of ischemic strokes are cryptogenic.
The classification systems for acute ischemic stroke are various. The Oxford Community Stroke Project classification, known as OCSP, also known as the Bamford or Oxford classification, primarily focuses on the initial symptoms; based on the extent of the symptoms, the stroke procedure is divided as total anterior circulation infarct, TACI for short, partial anterior circulation infarct, PACI for short, lacunar infarct, LACI for short, or posterior circulation infarct, POCI for short. These four types describe the extent of the stroke, the area of the brain affected, the cause, and the prognosis. The TOAST, known as Trial of Org 10172 in Acute Stroke Treatment, its rules of classification are founded on clinical symptoms also the results of further investigations; on this basis, a stroke may onset for (1) embolism of cardiac origin, (2) occlusion of a small blood vessel, (3) thrombosis or embolism due to atherosclerosis of large arteries, (4) other determined cause, (5) undetermined cause, includes two possible causes, incomplete investigation, or no cause identified.
Arcticle Source : http://bodycountry.com/stroke/2009/ischemic-stroke.html
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Tags: Embolism, Ischemic stroke, Systemic hypoperfusion, Thrombosis, Venous thrombosis