Substitution with Low-Osmolar Iodinated Contrast Agent to Minimize Recurrent Immediate Hypersensitivity Reaction

Area of Science:

• Radiology
• Pharmacology
• Clinical Medicine

Background:

• Hypersensitivity reactions (HSR) to low-osmolar iodinated contrast media (LOCM) pose a clinical challenge.
• Preventive strategies like premedication and switching LOCM have limitations.

Purpose of the Study:

• To identify the optimal preventive strategy for LOCM substitution in patients with a history of immediate HSR to LOCM.

Main Methods:

• Retrospective study of 1066 patients with prior immediate HSR to LOCM.
• Analysis of 3800 subsequent LOCM exposures using multivariate general estimating equation analysis.
• Evaluation of factors including age, sex, HSR severity, premedication, and LOCM substitution based on carbamoyl side chains.

Main Results:

• Corticosteroid premedication significantly reduced recurrent HSR (OR, 0.72; P = .049).
• Substituting LOCM with a different carbamoyl side chain showed similar recurrence rates (OR, 0.98; P = .93).
• Switching to LOCM without a common carbamoyl side chain significantly lowered HSR recurrence (OR, 0.51; P < .001), particularly for moderate-to-severe reactions.

Conclusions:

• Alternative LOCM without common carbamoyl side chains are effective in reducing recurrent HSR in patients with any severity of prior immediate HSR.
• This substitution strategy is a valuable preventive measure for managing LOCM hypersensitivity.