|Stroke is the condition which occur when the supply of blood to the different parts of the brain is interrupted or severely decreased depriving the brain tissue of oxygen and essential nutrients. Within the minutes, the brain cells begins to die. A stroke is a kind of medical emergency. Mini-strokes generally occurs when the supply of blood to the brain is concisely interrupted. Basically, the stroke is of two types. Firstly, called ischemic stroke that is caused by a blood clotting that blocks or plugs a blood vessel in the brain. Secondly called hemorrhagic stroke that is caused by a blood vessel that breaks and bleeds inside the brain.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information.The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.