Detection and allergen analysis of serum IgE in pediatric patients with chronic urticaria

Objective: To detect the serum IgE and allergen-specific IgE levels of pediatric patients with chronic urticaria, and to analyze the distribution characteristics of allergens. Methods: Ninety-six patients with chronic urticaria admitted in our hospital, which were not administered antihistamine 10 days before detection or glucocorticoid 20 days before detection, were selected. Their serum IgE levels were measured and 34 antigens were analyzed. Results: Ninety-two of the ninety-six patients were detected as serum IgE positive (positive rate: 95.83%). The positive serum IgE levels did not significantly change along with season (P>0.05). The positive detection rate of antigens was 95.83% (92/96), and the top five potent antigens included house dust mite, flour mite, histamine, egg yolk and egg white. Conclusion: Dust mite, as the most common antigen for pediatric patients with chronic urticaria, is prone to variations of specific IgE positive rate along with season. The results may be associated with the persistent warm and humid climate in this region.


INTRODUCTION
control the symptoms, radical treatment is difficult and recurrence easily occurs. Therefore, it is crucial to identify allergens and to propose targeted desensitization therapy. Chronic urticaria usually cannot be cured due to complicated etiology, which is caused by Type I or III allergic and non-allergic reactions after allergen contacts. Therefore, exploring pathogenesis and determining allergens are of great significance to the treatment of urticaria. [1][2][3] Due to different geographical environments, climates and dietary habits, there are large regional differences among the allergens that induce chronic urticaria. The pathogenesis for pediatric chronic urticaria is complex, which has been attributed to infections, allergen stimulation, genetic factors and autoimmune antibodies such as IgE. Although the roles of specific IgEs induced by various allergens in the pathogenesis of atopic dermatitis remain controversial, elevated IgE level has been significantly correlated with atopic

Original Article
Detection and allergen analysis of serum IgE in pediatric patients with chronic urticaria dermatitis. [4][5][6] On the other hand, multiple antigen simultaneous test (MAST) is a quick, sensitive, reliable and specific IgE detection method in vitro. 7 Thereby motived, we herein we aimed to study the positive rates of common allergens in children with type I or type III allergic reactions in this region, the distribution characteristics of various allergens and the relationship with season by MAST.

Baseline clinical data:
Ninety-six patients with chronic urticaria were enrolled in the study. It included 51 boys and 45 girls aged between 4 and 10 years old, (7.2 ± 2.8) on average. The disease courses ranged from 42 to 180 days (93.4 ± 42.7) on average. All patients did not take antihistamines or glucocorticoids 10 d or 20 d before detection. The patients who were in the acute phase of urticaria, or suffered from dermatographism, autoimmune disease or thyroid disease were excluded. MAST was performed. Grouping and treatment: The 96 selected children were randomly divided into a treatment group (n=48) and a control group (n=48). The treatment group comprised 26 boys and 22 girls, with the average age of (7.1 ± 2.9) years old and the average disease course of (93.1 ± 43.7) d. The control group consisted of 25 boys and 23 girls, with the average age of (7.3 ± 2.7) years old and the average disease course of (94.0 ± 42.5) d. No statistically significant differences were found in age, gender or duration between the two groups.
In the treatment group, allergen biological waves were reversed and amplified through corresponding programs according to the results of allergen detection and electromagnetic waves, and then input into the body for targeted desensitization therapy which was performed twice a week (about 30 minutes each time) for four consecutive weeks. The control group was given cetirizine hydrochloride tablets orally, 10 mg (once daily) for children over the age of 8 and 5 mg (once daily). The treatment course was four weeks.
A specific allergen IgE kit (BD, USA), which can detect serum total IgE and 34 kinds of specific allergens once, was used. Negativity was determined when 30 IU/mL< IgE level< 90 IU/mL, and positivity was determined when IgE level ≤30 IU/mL or ≥90 IU/mL. The samples were treated according to the kit's instructions, and then the results were read with a CLA-1 chemiluminescent analyzer (Beijing Sage Creation Science Co., Ltd., China). The children did not take corticosteroids 20 d before blood collection.
This study was approved by the ethics committee of our hospital. Written consent was been obtained before examination and treatment for enrolled patients according to the Declaration of Helsinki and relevant laws in China. All treatments were performed based on the patients' best interests. Evaluation criteria for therapeutic effects: Therapeutic effects were evaluated based on the symptoms and signs before and after treatment. 8 Scoring for pruritus: 0 point, without pruritus; 1 point, mild pruritus; 2 points, moderate pruritus; 3 points, severe pruritus. Scoring for reddening: 0 point, without reddening; 1 point, diameter of reddening <1.5 cm; 2 points, diameter of reddening ranged from 1.5 to 2.5 cm; 3 points, diameter of reddening >2.5 cm. Scoring for skin wheal: 0 point, without skin wheal; 1 point, 1~6 skin wheals; 2 points, 7~12 skin wheals; 3 points: >12 skin wheals.
Efficacy index (EI) = (score before treatmentscore after treatment)/score before treatment ´ 100%. Cured: EI>90%; effective: EI ranged from 70% to 90%; improved: EI ranged from 30% to 69%; ineffective: EI<30%. The percentage of cured and effective cases was used as the total effective rate. Statistical analysis: All data were analyzed by SPSS 12.0. Ranked data were compared by rank sum test. P<0.05 was considered statistically significant.

Total serum IgE levels in different seasons:
The total serum IgE of 92 cases was detected positive in the 96 children with chronic urticaria, with the positive rate of 95.83%. The positive rates of total serum IgE in different seasons were similar (P>0.05) ( Table-I Table-II.

DISCUSSION
Chronic urticaria cannot be effectively treated due to long course and undefined reasons, which is commonly treated by antihistamines. [9][10][11] Hashimoto et al. reported that the combination of mizolastine and tranilast managed to effectively and safely treat chronic urticaria. 12 Allergen detection protocols, such as allergen skin prick test, antigen solution skin test and immunoblotting, have widely been used. 13,14 Currently, bio-resonance technology based on the physical wave theory has been applied for allergen detection. Each substance has its own unique electromagnetic waves. Resonance occurs when two electromagnetic waves with the same frequency encounter. The spectrum frequency of each substance is unique. Allergy is a biophysical information phenomenon, contacting which human body may produce allergic prints that only retain the bio-resonance wave of the allergen. When the allergen is encountered again, two identical waves are resonant, and then induce common allergic diseases through biophysical pulse. This resonance wave can be recorded by computer, which can identify allergen and weaken allergy prints through wave transfusion, thereby treating allergic diseases. 15,16 Metz et al. conducted allergen detection for 92 cases of chronic urticaria using bio-resonance technology, all with positive results. 17 IgE-dependent allergic reaction produces IgE antibodies after human body's initial contacting with an antigen (allergen). Both the total serum IgE and IgE antibodies specific to a certain composite or purified antigen can be measured hitherto. 18 Detecting serum specific allergen can reflect whether a patient is susceptible to allergy and whether the allergen exists. It has also been reported that chronic urticaria was closely associated with increase of total IgE. 19 In this study, allergen detection showed that 92 of 96 children showed positive results, with the positive rate of 95.83% (92/96). The top 5 potent allergens were house dust mite, mite, histamine, egg yolk and egg white. Six kinds of allergens were detected at most in one child. Dust mite (Dermatophagoides farinae, house dust mite), also known as powder-fed cutaneous acariasis, can be found in poultry feed, warehouse dust and dust in textile mill, also inhabiting in house dusts, carpets and filling-type furniture. House dust mites, with dander off the body as the bait, are most commonly found in bed dusts, using sheets, pillows, quilts, fabric sofa and carpet as breeding grounds. Dust mites are allergens causing allergic disease, and their dander, eggs, carcasses, secretions and excretions have antigenicity that can induce allergic reaction when an allergic patient contacts with it. Demodicid mite prefers wet places with intolerance to heat, coldness and dryness, and humid and hot environment is most suitable for breeding mites. Thus, demodicid mites undergo most exuberant breeding between June and October each year. 20 In summary, we found that dust mite was the most common antigen for pediatric patients with chronic urticaria. The results in this study, however, failed to show the seasonal variations of dust mitespecific IgE positive rate, which may be related to the warm and humid climate all year around in this region.

Declaration of interest: None.
Source of funding: None.