A serious allergic reaction that onsets rapidly and can be even fatal is called anaphylaxis. It causes a number of symptoms, typically consisting of throat swelling, itchy rashes and low blood pressure. Insect bites or stings, foods and medications are some of the common causes. Its mechanism can be explained as a reaction occurring because of release of mediators or signals from certain white cells. This may be triggered by either an immunologic or non-immunologic mechanisms. Anaphylaxis can be diagnosed depending on the exhibited signs and symptoms. Administration of intravenous fluids, positioning of the patient flat and epinephrine injections may be considered as primary treatment. Other measures too can be used as a complementary action. The many different symptoms of anaphylaxis mat typically present themselves within minutes or hours after exposure to allergens. This may vary for 5 to 30 minutes if exposure is intravenous and up to 2 hours if caused by foodstuffs. The most common areas of the body that get affected by allergic reactions are skin, respiratory tract, gastrointestinal, heart and vasculature and the central nervous system. From all these, two or more may be involved.
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.
Last date updated on July, 2014