compared with allergic patients without atopic dermatitis, based on retrospective data from 347 individuals.
Atopic dermatitis has been associated with increased risk of food allergies, but the association and predictive factors of skin reactions to certain foods remain unclear, wrote Bryce C. Hoffman, MD, of National Jewish Health, Denver, and colleagues.
In a letter published in the Annals of Allergy, Asthma & Immunology, the researchers identified children aged 0-18 years with peanut, cow’s milk, and/or egg allergies with or without atopic dermatitis (AD) using an institutional research database and conducted a retrospective study of medical records.
Overall, children with egg and milk allergies plus AD had significantly higher rates of anaphylaxis than allergic children without AD (47% vs. 11% for egg, 50% vs. 19% for milk). Anaphylaxis rates were similar in children with peanut allergies with or without AD (27% vs. 23%).
“This finding may suggest that skin barrier dysfunction plays a role in the severity of [food allergy]. However, this is not universal to all food antigens, and other mechanisms are likely important in the association of anaphylaxis with a particular food,” the researchers noted.
Rates of tolerance for both baked egg and baked milk were similar between AD and non-AD patients (83% vs. 61% for milk; 82% vs. 67% for egg). In addition, levels of total IgE were increased in children with egg and milk allergies plus AD, compared with children without AD. However, children with peanut allergies plus AD had decreased total IgE, compared with children with peanut allergies but no AD. This “may support a link between Th2 polarization and [food allergy] severity, ” Dr. Hoffman and associates wrote.
The findings were limited by several factors, including the retrospective study design, exclusion of many patients, and lack of data on the amount of food that triggered anaphylactic reactions, the researchers noted.
Nonetheless, the results suggest that children with atopic dermatitis and allergies to eggs and milk are at increased risk and that clinicians should counsel these patients and families about the potential for more-severe reactions to oral food challenges, Dr. Hoffman and associates concluded.
The study was supported by National Jewish Health and the Edelstein Family Chair of Pediatric Allergy and Immunology. The researchers had no financial conflicts to disclose.
SOURCE: Hoffman BC et al. Ann Allergy Asthma Immunol. 2019 Sep 11. doi: 10.1016/j.anai.2019.09.008.