Anaphylaxis to radiographic contrast media

Area of Science:

• Radiology
• Allergy and Immunology

Background:

• Radiographic contrast media (RCM) are vital in modern diagnostics.
• Hypersensitivity reactions to nonionic RCM, including anaphylaxis, are significant concerns.
• Both immediate and nonimmediate reactions to RCM are observed.

Purpose of the Study:

• To review hypersensitivity reactions to radiographic contrast media.
• To discuss the role of diagnostic methods in identifying RCM hypersensitivity.
• To inform clinical practice regarding RCM administration and management.

Main Methods:

• Review of recent literature on anaphylaxis to gadolinium contrast media.
• Analysis of diagnostic approaches including skin tests (prick and intradermal) and serological tests.
• Evaluation of the efficacy of premedication strategies.

Main Results:

• Anaphylaxis to gadolinium contrast media is increasingly reported.
• The mechanism of RCM hypersensitivity is often unclear, with IgE-mediated allergy not always demonstrable.
• Skin tests (prick and intradermal) with diluted RCM are specific for diagnosing RCM hypersensitivity.

Conclusions:

• Skin test utility for selecting 'well tolerated' RCM needs further investigation.
• Pharmacological premedication may not prevent breakthrough reactions.
• Radiologists must be prepared to manage severe RCM-induced allergic reactions.