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Drug Toxicity: Allergic Reactions01:30

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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 exposure to a...
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In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
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In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses a challenge in...
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The importance of checking for delayed reactions in pediatric patch testing.

Catalina Matiz1, Kathryn Russell, Sharon E Jacob

  • 1Division of Pediatric and Adolescent Dermatology, Rady Children's Hospital, University of California, San Diego, California 92123, USA.

Pediatric Dermatology
|January 7, 2011
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Summary

A later reading of patch tests in children with suspected allergic contact dermatitis can reveal new positive reactions. This extended evaluation helps identify more allergens causing skin reactions in pediatric patients.

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Area of Science:

  • Dermatology
  • Pediatric Allergy
  • Contact Dermatitis

Background:

  • Patch testing is crucial for diagnosing allergic contact dermatitis.
  • Standard patch test readings are typically done at 72 hours.
  • Previous studies in adults suggest later readings increase diagnostic yield.

Purpose of the Study:

  • To investigate the value of late delayed readings in pediatric patch testing.
  • To determine if additional readings beyond 72 hours identify more relevant allergens in children.

Main Methods:

  • Prospective patch test study involving 38 children (aged 6-17) with suspected allergic contact dermatitis.
  • Patients underwent readings at 48 hours, 72-96 hours, and 168-216 hours (7-9 days).
  • Evaluated the number and type of positive reactions at each time point.

Main Results:

  • At 48 hours, 66% showed positive reactions; at 72 hours, 84% were positive.
  • A significant 50% had positive reactions at the 7-9 day reading.
  • Of those with late reactions, 13% had new delayed reactions, identifying clinically relevant allergens.

Conclusions:

  • Late delayed readings (7-9 days) are valuable in pediatric patch testing for allergic contact dermatitis.
  • Extended reading schedules may be necessary to identify all relevant allergens in children.
  • Further research is needed to establish optimal patch test reading schedules for pediatric patients.