Atopy and systemic reactions to drugs

Area of Science:

• Clinical Immunology
• Epidemiology
• Pharmacology

Background:

• Atopic status is crucial in epidemiological studies of allergic diseases.
• Systemic reactions to drugs (SR) are adverse events that may or may not be allergy-related.
• The relationship between SR and objective markers of atopy requires clarification for accurate epidemiological classification.

Purpose of the Study:

• To determine if a history of systemic reactions to drugs (SR) should be considered part of the atopic status in epidemiological research.
• To compare the prevalence of atopy, defined by specific IgE levels, in individuals with and without a history of SR to drugs.

Main Methods:

• A cross-sectional study involving 2067 adults (20-60 years old) undergoing routine health check-ups.
• Data collection included a questionnaire on the history of SR to drugs and a Phadiatop test to measure specific IgE against common aeroallergens.
• Statistical comparison of atopy prevalence between groups with and without a history of SR.

Main Results:

• 14.7% of participants reported a history of SR to drugs.
• While asthma, hay fever, and childhood dermatitis were more prevalent in the SR group, the percentage of positive Phadiatop tests (indicating atopy) was similar between groups.
• Objective atopy, defined by specific IgE, was not associated with a history of SR to drugs.

Conclusions:

• Atopy, as indicated by specific IgE levels, is not statistically associated with the occurrence of systemic reactions to drugs.
• A history of systemic reactions to drugs should not be included as a component of atopic status in epidemiological studies.
• This finding aids in refining the definition and classification of atopic conditions in population-based research.