There is a pervasive myth in the medical community that shellfish allergy precludes the use of radiocontrast media in diagnostic procedures. A study by Beaty et al. in 2006 in the US demonstrated that 37.2% of polled radiologists and 50% interventional cardiologists share this perception. We sought to determine the strength and or existence of this myth in Canada.
Methods:
We distributed Dr. Beaty’s survey to radiologists and interventional cardiologists (staff and residents) based at teaching hospitals across Canada. The survey consisted of 8 yes/no questions, with 2 questions of interest embedded amongst 6 distractors.
Results:
146 radiologists and 42 interventional cardiologists responded. 68% and 71% of responding radiologists and interventional cardiologists, respectively, indicated that they or someone on their behalf inquire about shellfish allergy prior to the administration of contrast. 12.5 % and 43% of responding radiologists and interventional cardiologists, respectively, claimed they would withhold radiocontrast media or recommend premedication if the patient had a positive history of shellfish allergy.
Conclusions:
The myth associating IgE mediated shellfish allergy and nonimmunologic anaphylactoid reactions to radiocontrast media is present in Canada. While Canadian radiologists are less likely to alter their management based on a history of shellfish allergy, Canadian interventional cardiologists report similar perceptions to their American counterparts. More education in this area is required.