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Multiple patch-test reactions: a pilot evaluation of a combination approach to visualize patterns of multiple
Heinrich Dickel1, James S Taylor, David R Bickers
1Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrueck, Osnabrueck, Germany.
Summary
Understanding multiple sensitivities in patch testing is crucial. This study analyzed patch-test data, finding common allergen pairs and introducing a new index to measure sensitivity patterns.
Area of Science:
- Dermatology
- Allergology
- Clinical Immunology
Background:
- Patterns of multiple sensitivities in patch testing are not well-defined.
- Previous studies focused on pairs of allergens, suggesting predisposing factors for multiple reactions.
Purpose of the Study:
- To analyze patterns of multiple sensitivities to identical allergens from standard screening trays.
- To reanalyze matched patch-test data from clinical units in Cleveland and Cologne over a 4-year period.
- To propose a computational method and a "multiple sensitivity index" (MSI) for characterizing allergen co-occurrence.
Main Methods:
- Utilized the statistical FREQ procedure for data analysis.
- Developed a program to compute and visualize multiple sensitivity patterns.
- Introduced the "multiple sensitivity index" (MSI) to quantify allergen co-occurrence.
Main Results:
- Evaluated 131,072 combinations across 2,881 patients.
- 12.4% of patients exhibited multiple positive patch tests (2-7 allergens).
- Most frequent allergen pairs included nickel sulfate/potassium dichromate and formaldehyde/quaternium-15. Nickel sulfate was the most frequent single sensitizer.
Conclusions:
- Larger patch-test databases are needed to confirm cluster patterns of multiple sensitivities.
- Further validation of the "multiple sensitivity index" (MSI) is required.
- The study provides a foundation for understanding complex allergen interactions in patch testing.