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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 26, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Anaphylaxis.

Harold Kim1, David Fischer

  • 1University of Western Ontario, London, Ontario, Canada. hlkimkw@gmail.com.

Allergy, Asthma, and Clinical Immunology : Official Journal of the Canadian Society of Allergy and Clinical Immunology
|December 15, 2011
PubMed
Summary
This summary is machine-generated.

Anaphylaxis is a severe allergic reaction that requires prompt recognition and treatment with epinephrine. Early diagnosis and management are crucial for patient safety and long-term health.

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Area of Science:

  • Allergy and Immunology
  • Emergency Medicine
  • Clinical Medicine

Background:

  • Anaphylaxis is a critical, life-threatening systemic allergic reaction with diverse clinical presentations.
  • Delayed recognition and diagnosis by patients and healthcare providers are significant challenges.
  • Cutaneous symptoms like angioedema and urticaria are common clinical manifestations.

Purpose of the Study:

  • To provide a comprehensive overview of anaphylaxis.
  • To detail the causes, clinical features, and diagnostic approaches.
  • To outline both acute and long-term management strategies.

Main Methods:

  • Review of existing literature on anaphylaxis.
  • Synthesis of information on clinical presentations and diagnostic criteria.
  • Consolidation of current treatment guidelines for acute and chronic care.

Main Results:

  • Anaphylaxis presents with varied symptoms, commonly including skin reactions.
  • Immediate intramuscular epinephrine is the primary treatment, regardless of diagnostic certainty.
  • Effective long-term management involves specialist evaluation, allergen avoidance, and epinephrine auto-injectors.

Conclusions:

  • Prompt recognition and immediate epinephrine administration are vital for managing anaphylaxis.
  • Comprehensive management includes allergen avoidance and patient education with action plans.
  • Understanding the multifaceted nature of anaphylaxis is key for healthcare professionals.