|It is clinical condition which occurs due to obstacles in the supply of blood to the brain which results in to minor stroke. It is second common form of dementia after Alzheimer's diseaseÂ (AD) in aged person. Risk factor of this disease is age, hypertension, smoking, hypercholesterolemia, diabetes mellitus and cardiovascular diseases etc. It can be managed by preventing cerebrovascular lesions and by giving medication such as cholinesterase inhibitors.The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number ofÂ citationsÂ to recent articles published inÂ science and social science journals in a particular year or period, and is frequently used as aÂ proxyÂ for the relative importance of a journal within its field. It is first devised byÂ Eugene Garfield, the founder of theÂ 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.