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Anaphylactoid Reactions

Anaphylactoid reactions have symptoms similar to those of anaphylaxis, but are triggered instead by non- IgE mechanisms which directly cause the release of these mediators. These include reactions to nonsteroidal anti-inflammatory drugs (e.g., aspirin, ibuprofen), radiocontrast dye (used for x-ray studies) and exercise.
Anaphylactoid reactions to contrast material occur more frequently in patients taking beta-blocker medications and in those sensitive to crustaceans/mussels. If studies involving contrast material are ordered, beta-blockers should be discontinued. In crustacean-sensitive patients, an alternative procedure or use of non-ionic contrast material should be considered, as well as prophylactic pretreatment with antihistamines / steroid s.



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