It has generally been thought that iodine allergy is cross-sensitive to various iodine-containing chemicals. However, this concept seems to deviate from the immunological principle that immune recognition is specific. To solve this contradiction, we hypothesize that iodine allergy is an immunological reaction to iodinated autologous proteins produced in vivo by iodination reaction from various iodine-containing chemicals. Antisera to iodine were obtained from guinea pigs immunized subcutaneously with iodine-potassium iodide solution emulsified in complete Freund's adjuvant (CFA). The specificity of guinea pig anti-iodine antiserum was determined by enzyme-linked immunosorbent assay (ELISA) inhibition experiments using microplates coated with iodinated guinea pig serum albumin (I-GSA). Antibody activities were inhibited by I-GSA, diiodo-L-tyrosine, and thyroxine, but not by potassium iodide, monoiodo-L-tyrosine, 3,5,3'-triiodothyronine, monoiodo-L-histidine, or diiodo-L-histidine, or by ionic or non-ionic iodinated contrast media. The results that antigen recognition of anti-iodine antibody is specific to iodinated protein support our hypothesis. While protein iodination usually takes place both at histidine residues as well as at tyrosine residues, only iodinated tyrosine acted as an antigenic determinant and no antibody activities to iodinated histidine were detected in our experimental iodine allergy model.
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http://dx.doi.org/10.2131/jts.29.131 | DOI Listing |
Can Assoc Radiol J
January 2025
Department of Radiology, Dalhousie University, Halifax, NS, Canada.
Contrast media, including iodinated contrast media and gadolinium-based contrast agents, are commonly administered pharmaceuticals with excellent safety profiles. However, a minority of the population may experience a hypersensitivity reaction following intravenous administration. Hypersensitivity reactions can be immediate or delayed, and range from mild, such as urticaria, to severe, including anaphylaxis.
View Article and Find Full Text PDFAm J Obstet Gynecol
January 2025
Houston Methodist Hospital, Department of Obstetrics and Gynecology, Division of Urogynecology, Houston TX 77030.
Objective: To compare the rates of surgical site infection (SSI) after hysterectomy using vaginal antisepsis with chlorhexidine gluconate (CHG) versus povidone-iodine (PI).
Data Sources: PubMed, Embase, and Clinicaltrials.gov databases were queried from January 1, 1985 through Dec 7, 2023.
Neuroradiol J
January 2025
Department of Neurosurgery, Brain Research Institute, Niigata University, Niigata, Japan.
Gadolinium contrast medium can serve as an alternative to iodinated contrast medium when the latter is unsuitable. In this report, we describe a case of a carotid-ophthalmic aneurysm in which angiograms were obtained using gadolinium contrast medium for flow-diverter stent placement due to the patient's history of bronchial asthma and hypersensitivity reactions to iodinated contrast medium. To enhance the visibility of gadolinium contrast medium, which typically provides lower contrast compared to iodinated contrast medium, we employed a contrast-enhancing and noise-reducing protocol on our image-guided therapy system.
View Article and Find Full Text PDFEur J Radiol
December 2024
Allergy Unit, Allergo-Anaesthesia Unit, Hospital Universitario de la Cruz Roja, Madrid, Spain.
The risk of developing a severe delayed cutaneous reaction (SCAR) is very low following iodine-based contrast medium (ICM) administration and extremely low following gadolinium-based contrast agent (GBCA) administration. However, SCAR can be very severe and potentially life-threatening. It is crucial for the imaging physician to recognize danger signals: bullous skin eruption, skin erosion and detachment, mucosal involvement, systemic symptoms, and laboratory abnormalities.
View Article and Find Full Text PDFJ Vasc Interv Radiol
December 2024
Division of Endocrinology, Diabetes, Metabolism and Nutrition, Department of Internal Medicine, Mayo Clinic, Rochester, MN.
Purpose: To evaluate the impact of corticosteroid premedication on the performance of adrenal vein sampling (AVS) in patients with primary aldosteronism (PA) and allergy to iodinated contrast media (ICM).
Materials And Methods: Patients who underwent AVS for PA, between September 1990 and October 2023, were retrospectively identified. Patients with ICM allergy who received corticosteroid pre-medication were matched 1:1 with patients without contrast allergy.
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