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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
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 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...
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: 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...

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Measuring Local Anaphylaxis in Mice
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Exercise-induced anaphylaxis: A clinical view.

Carlotta Povesi Dascola1, Carlo Caffarelli

  • 1Clinica Pediatrica, Dipartimento di Medicina Clinica e Sperimentale, Azienda Ospedaliera-Universitaria di Parma, Università degli Studi di Parma, Via Gramsci 14, Parma, Italy.

Italian Journal of Pediatrics
|September 18, 2012
PubMed
Summary
This summary is machine-generated.

Exercise-induced anaphylaxis (EIA) is a rare allergic reaction during exertion, often needing specific triggers. Early diagnosis and patient education are key for managing this serious condition.

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Area of Science:

  • Allergy and Immunology
  • Exercise Physiology

Background:

  • Exercise-induced anaphylaxis (EIA) is a rare but serious allergic reaction.
  • It often requires co-factors like food, drugs, or environmental conditions.
  • EIA is frequently misdiagnosed or undertreated, impacting patient quality of life.

Purpose of the Study:

  • To review current evidence on the pathophysiology, diagnosis, and management of EIA.
  • To highlight the role of mast cell mediators in EIA development.
  • To provide guidance for accurate diagnosis and effective long-term care.

Main Methods:

  • Literature review of recent advances in EIA research.
  • Analysis of pathogenetic factors, including mast cell degranulation.
  • Development of a diagnostic algorithm incorporating medical history, IgE testing, and exercise challenge tests.

Main Results:

  • Mast cell mediator release appears crucial in EIA pathophysiology.
  • A diagnostic algorithm can aid in identifying EIA accurately.
  • Proper diagnosis enables appropriate management, including dietary adjustments and physical activity allowances.

Conclusions:

  • Accurate diagnosis of EIA is essential for appropriate patient management.
  • Patient and caregiver education on trigger avoidance and emergency treatment is vital.
  • Further research is needed to address remaining questions in EIA management.