Ischemic stroke occurs when a blood clot blocks a blood vessel carrying blood to the mind. This causes blood to not reach the brain. High blood pressure is the main risk factor for this type of stroke. Ischemic strokes account for about 87% of all strokes. An ischemic stroke can occur in two ways.
Once in the brain, the clot travels to a blood vessel small enough to obstruct its passage. The clot lodges there, blocking the blood vessel and causing a stroke. About 15% of embolic strokes occur in people who have atrial fibrillation (Afib). The medical word for this sort of blood clot is embolus.
A thrombotic stroke is the result of a blood clot that forms inside among the arteries supplying blood to the mind. This type of stroke is usually found in people who have atherosclerosis and high cholesterol levels. The medical word to get a clot that forms on a blood-vessel deposit is thrombus.
Two kinds of blood clots can cause thrombotic stroke: big vessel thrombosis and small vessel disease.
Large Vessel Thrombosis
The most frequent type of thrombotic stroke (large vessel thrombosis) happens in the brain’s larger arteries. In most cases it’s brought on by long term atherosclerosis in combination with fast blood clot formation. High cholesterol is a familiar risk factor for this kind of stroke.
Small Vessel Disease
Another type of thrombotic stroke occurs when blood circulation is blocked to quite a small arterial vessel (small vessel disease or lacunar infarction). Little is known concerning the reasons for such a stroke, but it is linked to high blood pressure.