Ischemic
stroke occurs when an artery to the
brain is blocked. The
brain depends on its arteries to bring fresh blood from the heart and lungs. The blood carries oxygen and nutrients to the brain, and takes away carbon dioxide and cellular waste. If an artery is blocked, the
brain cells (neurons) cannot make enough energy and will eventually stop working. If the artery remains blocked for more than a few minutes, the
brain cells may die. This is why immediate medical treatment is critical. Ischemic
stroke can be caused by several different kinds of diseases. The most common problem is narrowing of the arteries in the neck or head. This is most often caused by atherosclerosis, or gradual cholesterol deposition. If the arteries become too narrow, blood
cells may collect and form blood clots. These blood clots can block the artery where they are formed (thrombosis), or can dislodge and become trapped in arteries closer to the
brain (embolism). Another cause of
stroke is blood clots in the heart, which can occur as a result of irregular heartbeat (for example, atrial fibrillation), heart attack, or abnormalities of the heart valves. While these are the most common causes of ischemic stroke, there are many other possible causes. Examples include use of street drugs, traumatic injury to the blood vessels of the neck, or disorders of blood clotting. A thrombotic
stroke occurs when diseased or damaged cerebral arteries become blocked by the formation of a blood clot within the brain. Clinically referred to as
cerebral thrombosis or cerebral infarction, this type of event is responsible for almost 50 percent of all strokes. Cerebral thrombosis can also be divided into an additional two categories that correlate to the location of the blockage within the brain: large-vessel thrombosis and small-vessel thrombosis. Large-vessel thrombosis is the term used when the blockage is in one of the brain’s larger blood-supplying arteries such as the carotid or middle cerebral, while small-vessel thrombosis involves one (or more) of the brain’s smaller, yet deeper, penetrating arteries. This latter type of
stroke is also called a lacunar stroke. Citations are important for a journal to get impact factor. Impact
factor is a measure reflecting the average number of citations to recent
articles published in the journal. The impact of the journal is influenced by impact factor, the
journals with high impact
factor are considered more important than those with lower ones. Impact
factor plays a major role for the particular journal. Journal with higher impact
factor is considered to be more important than other ones. Impact
factor can be calculated as average number of citation divided by recent cited
articles published in 2 years.
Relevant Topics in Neuroscience & Psychology