|It is clinical term which is used for heart attack. If blood stops flowing to a part of the heart, then heart muscle get injured due to insufficient oxygen which leads to the myocardial infarction. Risk factors are age, excessive tobacco smoking, high lipid in blood, high blood pressure, obesity, lack of physical activity etc. It can be immediately treated by aspirin. Common symptoms are chest pain, ischemia, pain in the left arm, back and upper abdomen.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.