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Related Concept Videos

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...
Hypersensitivities01:30

Hypersensitivities

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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Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
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Healing II: Complications01:24

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Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...
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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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Updated: Jun 20, 2026

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
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[Side effects, complications and contraindications of patch-tests].

M Castelain1

  • 1Service de dermatologie, hôpital Sainte-Marguerite, 270, avenue de Sainte-Marguerite, 13274 Marseille cedex 09, France. mcastel1.mrs@wanadoo.fr

Annales De Dermatologie Et De Venereologie
|August 19, 2009
PubMed
Summary

Properly performed patch testing typically has mild side effects. However, complications like false sensitization can occur, influenced by patient health and allergen type.

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Area of Science:

  • Dermatology
  • Allergology
  • Clinical Immunology

Background:

  • Patch testing is a common diagnostic tool for allergic contact dermatitis.
  • Potential side effects can impact test accuracy and interpretation.
  • Understanding contraindications is crucial for safe and effective testing.

Purpose of the Study:

  • To review the potential side effects of patch testing.
  • To discuss complications that may interfere with results.
  • To outline contraindications for patch testing.

Main Methods:

  • Literature review of patch testing guidelines and adverse events.
  • Analysis of factors influencing test interpretation and complications.
  • Discussion of patient-specific and allergen-specific contraindications.

Main Results:

  • Most side effects are mild and transient.
  • A significant complication is the induction of false-positive allergen-specific sensitization.
  • Contraindications include patient factors (e.g., immunosuppression, pregnancy, eczema) and allergen properties (e.g., irritant potential).

Conclusions:

  • Proper patch testing minimizes side effects.
  • Awareness of potential complications and contraindications is essential for accurate diagnosis.
  • Careful patient selection and allergen choice optimize patch test safety and efficacy.