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Patient allergies: role in selective use of nonionic contrast material
J D Halpern1, K D Hopper, M G Arredondo
1College of Medicine, Pennsylvania State University, Hershey, PA 17033, USA.
Radiology
|May 1, 1996
Summary
Allergists and immunologists recommend limiting nonionic contrast material use in patients with prior allergies to only those with serious or life-threatening reactions. A history of non-contrast material allergy alone is not sufficient indication.
Area of Science:
- Allergy and Immunology
- Radiology
- Pharmacology
Background:
- Patient allergies to contrast media necessitate careful consideration for diagnostic imaging procedures.
- Nonionic contrast materials are often preferred due to a lower risk of adverse reactions compared to ionic agents.
- Guidelines for the selective use of nonionic contrast material in allergic patients are evolving.
Purpose of the Study:
- To ascertain the recommendations of allergists and immunologists regarding specific patient allergy profiles for the selective use of nonionic contrast material.
- To identify key indicators of patient allergy that influence the decision-making process for contrast material selection.
Main Methods:
- A survey was distributed to 1,017 allergists and immunologists, focusing on patient allergies and the selective use of nonionic contrast material.
- Data was collected from 287 respondents regarding their clinical judgment and recommendations.
Main Results:
- A significant majority (262 out of 287) of respondents agreed that an allergy solely related to non-contrast material does not warrant the use of nonionic contrast material.
- The primary indication for nonionic contrast material use was identified as a previous serious or life-threatening reaction (219 respondents), while minor reactions were deemed insufficient.
- Respondents favored a tiered approach for patients with any history of contrast material reactions, including using nonionic contrast material alone, pre-medication with steroids followed by nonionic contrast material, or withholding contrast material entirely.
Conclusions:
- The use of nonionic contrast material in patients with a history of allergic reactions to contrast media should be judiciously applied.
- Recommendations emphasize reserving nonionic contrast material for patients who have experienced severe or life-threatening reactions to prior contrast agents.
- Clinical decisions should be individualized, considering the severity of previous reactions and potentially employing alternative strategies such as pre-medication or avoidance.