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Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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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...
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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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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...
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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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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...
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A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
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Basics of patch testing for allergic contact dermatitis.

Mark D P Davis1, Sara A Hylwa, Eve M Allen

  • 1Department of Dermatology, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA. davis.mark2@mayo.edu

Seminars in Cutaneous Medicine and Surgery
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Patch testing is crucial for diagnosing allergic contact dermatitis by identifying specific allergens. This review details the correct procedures for performing patch tests and interpreting their outcomes.

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Area of Science:

  • Dermatology
  • Allergology
  • Immunology

Background:

  • Allergic contact dermatitis (ACD) is a prevalent skin condition.
  • Accurate allergen identification is key for managing ACD.
  • Patch testing is the gold standard for diagnosing ACD.

Purpose of the Study:

  • To provide a comprehensive review of patch testing procedures.
  • To guide clinicians in performing and interpreting patch tests.
  • To enhance the diagnostic accuracy of allergic contact dermatitis.

Main Methods:

  • Review of established patch testing protocols.
  • Detailed explanation of allergen application and exposure.
  • Guidance on standardized interpretation of test results.

Main Results:

  • Patch testing effectively identifies causative allergens in ACD.
  • Proper technique and interpretation are vital for reliable results.
  • This review offers a standardized approach to patch testing.

Conclusions:

  • Patch testing is an indispensable tool for diagnosing ACD.
  • Adherence to standardized methods ensures accurate allergen identification.
  • Effective interpretation of patch tests leads to better patient management.