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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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...
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
06:31

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Published on: October 3, 2019

Variability in patch test reactions--first report from the Norwegian Patch Test Registry.

Per Helsing1, Petter Gjersvik, Jan-Øivind Holm

  • 1Department of Dermatology, Oslo University Hospital, Oslo, Norway. per.helsing@rikshospitalet.no

Contact Dermatitis
|June 12, 2010
PubMed
Summary
This summary is machine-generated.

Regional differences in allergic contact dermatitis sensitization exist in Norway. The Norwegian Patch Test Registry (NOLAR) found significant variations in reactions to common allergens across dermatology departments.

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Area of Science:

  • Dermatology
  • Allergology
  • Epidemiology

Background:

  • The Norwegian Patch Test Registry (NOLAR) was established in 2005, involving six dermatology departments.
  • International studies show significant variability in patch test reaction frequencies, often attributed to diverse patient populations.

Purpose of the Study:

  • To investigate the variability of positive patch test reactions.
  • To analyze patch test data from six collaborating Norwegian dermatology departments using standardized methods.

Main Methods:

  • Utilized data from 2,089 patch tests conducted between 2007-2008, registered in the NOLAR program.
  • Employed Exact Pearson chi-squared test to analyze inter-center differences in allergen reactions.

Main Results:

  • Significant variations in positive reactions were observed for 8 out of 26 allergens in the European Baseline Series across centers.
  • Strong reactions (++) to cobalt chloride, potassium dichromate, p-phenylenediamine, formaldehyde, paraben mix, and mercaptobenzothiazole showed statistically significant differences between centers.

Conclusions:

  • Findings suggest regional variations in sensitization prevalence to specific allergens within the Norwegian population.
  • Inter-observer variability in patch testing cannot be definitively excluded as a contributing factor to observed differences.