eMedicine - Anaphylaxis : Article by Richard S Krause, MD Anaphylaxis - Anaphylaxis refers to a severe allergic reaction in which prominent dermal and systemic signs and symptoms manifest. The full-blown syndrome includes urticaria (hives) and/or angioedema with hypotension and bronchospasm. The classic form, described in 1902, involves prior sensitization to an allergen with later re-exposure, producing symptoms via an immunologic mechanism. An anaphylactoid reaction produces a very similar clinical syndrome but is not immune-mediated. Treatment for both conditions is similar, and this article uses the term anaphylaxis to ... Overview: Anaphylaxis is a severe allergic reaction that is rapid in onset and may cause death. There are usually prominent dermal and systemic signs and symptoms. The full-blown syndrome includes urticaria (hives) and/or angioedema with hypotension and ... allergicallergyanaphylacticanaphylactoidanaphylatoxinanaphylaxisangioedemaimmunologicreactionsevereshockurticaria By DMColein Saved Today 1with savedtodayanaphylaxisreferssevereallergicreactionprominent