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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

34.4K
Overview
34.4K
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

237
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,...
237
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

181
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...
181
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

229
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...
229
Allergic Drug Reactions01:27

Allergic Drug Reactions

1.6K
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...
1.6K
Hypersensitivities01:30

Hypersensitivities

8.7K
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...
8.7K

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Related Experiment Video

Updated: Apr 18, 2026

Measuring Local Anaphylaxis in Mice
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Cholinergic urticaria and exercise-induced anaphylaxis.

Stefan L Montgomery1

  • 1Stefan Montgomery, MD, Family and Sports Medicine, Orangeburg, SC.

Current Sports Medicine Reports
|January 10, 2015
PubMed
Summary

Cholinergic urticaria and exercise-induced anaphylaxis are chronic conditions triggered by elevated body temperature or exercise. This article details their causes, symptoms, and treatments.

Area of Science:

  • Dermatology
  • Allergology
  • Immunology

Background:

  • Cholinergic urticaria is chronic hives from increased body temperature.
  • Exercise-induced anaphylaxis is a severe allergic reaction to physical activity.

Purpose of the Study:

  • To differentiate and describe cholinergic urticaria and exercise-induced anaphylaxis.
  • To provide a comprehensive overview of these conditions.

Main Methods:

  • Literature review and synthesis of existing research.
  • Comparative analysis of clinical presentations.

Main Results:

  • Both conditions present with distinct but sometimes overlapping symptoms.
  • Understanding pathophysiology aids in diagnosis and management.

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Related Experiment Videos

Last Updated: Apr 18, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

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Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Conclusions:

  • Accurate diagnosis is crucial for effective treatment and management.
  • Further research can improve therapeutic strategies for these conditions.