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Related Concept Videos

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...
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...
Allergic Reactions02:06

Allergic Reactions

Overview
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),...
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...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...

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Related Experiment Video

Updated: Jul 4, 2026

Granulocyte-dependent Autoantibody-induced Skin Blistering
12:23

Granulocyte-dependent Autoantibody-induced Skin Blistering

Published on: October 12, 2012

[Chronic urticaria].

V Morel1, C Hauser

  • 1vincent.morel@bluewin.ch

Revue Medicale Suisse
|June 19, 2008
PubMed
Summary
This summary is machine-generated.

Chronic urticaria (CU), a common skin condition, significantly impacts quality of life. While autoantibodies are present in some cases, extensive testing is often unnecessary, with antihistamines being the primary treatment.

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Basophil Activation Test for Allergy Diagnosis
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Last Updated: Jul 4, 2026

Granulocyte-dependent Autoantibody-induced Skin Blistering
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Granulocyte-dependent Autoantibody-induced Skin Blistering

Published on: October 12, 2012

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Area of Science:

  • Immunology
  • Dermatology

Context:

  • Chronic urticaria (CU) is a prevalent condition with significant quality of life implications.
  • The etiology of CU remains largely unknown in many cases.

Purpose:

  • To summarize the current understanding of chronic urticaria.
  • To provide guidance on diagnostic workup and treatment strategies for CU.

Summary:

  • Antibodies to the high-affinity receptor for IgE (FcεRI) are identified in 30% of CU patients, potentially correlating with symptom severity.
  • Extensive diagnostic workups for underlying pathologies are generally not recommended for CU without specific clinical indicators.
  • Newer generation oral antihistamines are the established first-line therapy for CU.
  • Limited controlled studies support the use of alternative treatments for refractory CU cases.

Impact:

  • Highlights the importance of targeted diagnostic approaches in CU.
  • Emphasizes the role of antihistamines as the cornerstone of CU management.
  • Underscores the need for further research into treatments for refractory chronic urticaria.