Contrast Agents and Allergic Reactions

In practice

Follow how a reaction is recognized and handled. First, the risk is identified beforehand: allergies are asked about and recorded, including reactions to iodine-containing products. The textbook notes that a shellfish allergy is now thought to relate to fish protein rather than iodine, so the history matters more than assumptions. Second, during or after the contrast is given, signs of a reaction are watched for, such as itching, a burning sensation, hives or swelling. Third, if a reaction occurs, the injection stops and the anesthesia provider or physician is alerted at once. Fourth, the reaction is documented and the patient's allergy record updated.