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The term anaphylaxis applies to anaphylactic (immunoglobulin E [IgE]–mediated) and anaphylactoid (non–IgE-mediated) release of immune mediators from basophils and mast cells. It is a severe, potentially fatal, systemic allergic reaction. Therefore, it is imperative to recognize the signs and symptoms of anaphylaxis and treat it rapidly. The most common triggers are peanuts, tree nuts, and shellfish, although anaphylaxis in an inpatient may be triggered by exposure to latex, radiocontrast material, medications, or foods (Table 4–1).

As many as 15% to 20% of patients will have a biphasic response, with most episodes occurring within 6 to 12 hours after...

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