Relationship between Total Serum IgE Level and Allergic Sensitization/Bronchial Hyperresponsiveness in Preschool Children with Asthma

Jun, Jae Sung; Yun, Ki Tae; Kang, Im Ju

Abstract

PURPOSE
This study aimed to evaluate the relationship between the serum IgE level and allergic sensitization/bronchial hyperresponsiveness (BHR) in preschool children with asthma.
METHODS
One hundred nine asthmatic children age 4-6 years were enrolled. Total serum IgE levels, and specific IgE level to food and inhalant allergens were tested using Pharmacia Auto CAP system RAST(R)FEIA, methacholine bronchial challenge test (PCw=Provocative concentration at wheezing. PCsat=Provocative concentration at 5% fall of oxygen saturation) were performed in all subjects. They were divided into 3 groups according to the serum IgE level:less than 120 IU/mL (group A, n=38), 120 to 1,000 IU/mL (group B, n=45), and greater than 1,000 IU/mL (group C, n=26). The relationships with allergic sensitization and BHR were evaluatied among the 3 groups.
RESULTS
Sensitization to foods and inhalant allergens were related to a higher total serum IgE levels. However, BHR and severity of asthma were not related to higher total serum IgE levels, except in group B. Presence of atopic dermatitis, high serum eosinophil (>450/mm3), allergic sensitization to foods and inhalants were related to high serum IgE greater than 1,000 IU/mL. (odds ratio ; 95% confidence interval=4.4;1.7-11.2, 3.2;1.2-9.2, 4.8;1.7-13.2, 5.5;1.2-24.9)
CONCLUSION
Moderately elevated total serum IgE was related to allergic sensitization, severity of asthma and BHR. However highly elevated total serum IgE was related to only allergic sensitization. This may be attributed to other factors in preschool children with asthma.