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Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

181
Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
181

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North American contact dermatitis group patch test results: 2011-2012.

Erin M Warshaw1, Howard I Maibach, James S Taylor

  • 1From the University of Minnesota and the Minneapolis VAMC; University of California, San Francisco; Cleveland Clinic, Ohio; McGill University Health Centre, Montreal; University of Toronto, Canada; Ohio State University, Columbus; Associates in Dermatology, Fort Myers, Fla; Group Health Associates, Cincinnati, Ohio; Dartmouth Medical Center, Lebanon, NH; St. Luke's Roosevelt Hospital Center, New York, NY; Dermatology Specialists, Louisville, KY; Pennsylvania State University Hershey; University of Ottawa, Canada; Oregon Health Sciences University, Portland; and Columbia University Medical Center, New York, NY.

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|January 13, 2015
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Summary
This summary is machine-generated.

Patch testing reveals increasing sensitivity to methylisothiazolinones in North America, a trend seen in Europe. Comprehensive allergen testing beyond standard screening is crucial for diagnosing allergic contact dermatitis (ACD).

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Area of Science:

  • Dermatology
  • Allergology
  • Epidemiology

Background:

  • Patch testing is a key diagnostic method for allergic contact dermatitis (ACD).
  • The North American Contact Dermatitis Group (NACDG) collects and analyzes patch test data.
  • Understanding trends in allergen sensitivity is vital for public health.

Purpose of the Study:

  • To document NACDG patch-testing results from 2011-2012.
  • To identify trends in allergen sensitivity in North America.
  • To assess the diagnostic utility of standard patch test trays.

Main Methods:

  • Standardized patch testing with 70 allergens was performed at 12 North American centers.
  • Data were collected, verified, and entered into a central database.
  • Descriptive frequencies and statistical analyses (chi-square) were used to analyze trends.

Main Results:

  • Over 4,200 patients were tested, with 63.8% showing at least one positive reaction.
  • Allergic contact dermatitis (ACD) was the primary diagnosis for 48.0% of patients.
  • Statistically significant increases in positive reaction rates were observed for methylchloroisothiazolinone/methylisothiazolinone, lanolin alcohol, cinnamic aldehyde, glutaral, paraben mix, and fragrance mix I.
  • Positivity rates for formaldehyde-releasing preservatives significantly decreased compared to the previous decade.
  • A notable proportion of patients had reactions to non-NACDG allergens, and some reactions detected by NACDG allergens could be missed by standard screening trays.

Conclusions:

  • The study highlights the emergence of methylisothiazolinone sensitivity in North America, mirroring European trends.
  • Extended patch testing, including allergens beyond standard screening trays, is essential for thorough ACD evaluation.
  • These findings underscore the dynamic nature of allergen sensitization and the need for ongoing surveillance.