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Related Concept Videos

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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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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Allergic Reactions: Anaphylaxis01:30

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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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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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Drug toxicity: Idiosyncratic Reactions01:16

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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...
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Skin testing and patch testing in non-IgE-mediated drug allergy.

Annick Barbaud1

  • 1Dermatology and Allergy department, University Hospital of Nancy, Pole des specialités medicales, Universite de Lorraine, Brabois Hospital, 6 rue du Morvan, Vandoeuvre les Nancy, 54500, France, a.barbaud@chu-nancy.fr.

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Drug skin tests, including patch tests (DPTs) and intradermal tests (IDTs), help diagnose delayed hypersensitivity reactions to medications. While DPTs are valuable for specific rashes like DRESS, IDTs show higher sensitivity for certain drug classes.

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Area of Science:

  • Dermatology
  • Clinical Immunology
  • Pharmacology

Background:

  • Delayed hypersensitivity reactions to drugs are common.
  • Drug skin tests (DSTs) can reproduce these reactions but require careful interpretation.
  • Standardization of some DST techniques, like intradermal tests (IDTs), is lacking.

Purpose of the Study:

  • To evaluate the utility and limitations of various drug skin tests for diagnosing non-immediate adverse drug reactions.
  • To compare the diagnostic value of drug patch tests (DPTs), prick tests, and IDTs in different clinical scenarios.
  • To provide guidance on the appropriate use of DSTs in clinical practice.

Main Methods:

  • Review of existing literature on drug skin tests, including DPTs, prick tests, and IDTs.
  • Analysis of the sensitivity and specificity of different DSTs for various drug-induced eruptions.
  • Discussion of the indications, contraindications, and standardization issues related to DSTs.

Main Results:

  • DPTs are useful for maculopapular rashes, flexural exanthemas, fixed drug eruption, acute generalized exanthematous pustulosis, and drug reaction with eosinophilia and systemic symptoms (DRESS).
  • IDTs with delayed readings are highly sensitive for non-severe delayed reactions, particularly to beta-lactam antibiotics, radiocontrast media, and heparins.
  • A negative DST does not exclude drug causality; drug rechallenge may be necessary in non-severe cases.

Conclusions:

  • Drug skin tests are valuable tools for diagnosing delayed hypersensitivity to drugs, but their utility varies by test type and clinical presentation.
  • DPTs are indicated for specific eruptions like DRESS, while IDTs are more sensitive for certain drug classes.
  • Careful patient selection, adherence to guidelines, and consideration of drug rechallenge are crucial for accurate diagnosis.