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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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, heparin),...
Allergic Reactions02:06

Allergic Reactions

Overview
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.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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...
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...
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...

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Related Experiment Video

Updated: May 22, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

[Urticaria. Basic knowledge for the ENT specialist].

V Daut1, P Staubach, K Hörmann

  • 1HNO-Universitätsklinik, Mannheim.

HNO
|May 10, 2012
PubMed
Summary
This summary is machine-generated.

Urticaria, a common skin condition causing itchy wheals, affects 25% of people. This review covers acute and chronic forms, focusing on diagnosis and treatment according to international guidelines.

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Area of Science:

  • Dermatology and Immunology

Context:

  • Urticaria is a prevalent skin condition characterized by itching wheals, affecting 25% of the population.
  • It encompasses heterogeneous diseases, with spontaneous urticaria (acute and chronic subtypes) being the most common.

Purpose:

  • To provide an overview of the clinical symptoms, diagnostic methods, and therapeutic options for acute and chronic spontaneous urticaria.
  • To reference current international (EAACI/WAO) and German (DGAKI/DDG) guidelines for urticaria management.

Summary:

  • Wheal formation in urticaria results from mast cell activation and degranulation, with multifaceted etiologies.
  • Acute spontaneous urticaria is typically self-limiting and treated symptomatically.
  • Chronic spontaneous urticaria requires identification and elimination of underlying causes like autoimmune processes, food additive intolerance, or chronic infections for curative treatment.

Impact:

  • Urticaria has a significant socioeconomic impact, particularly the chronic form which can persist for years.
  • Familiarity with urticaria is essential for ENT specialists due to its relevance.
  • Effective management strategies based on current guidelines can improve patient outcomes and reduce disease burden.