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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...
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...
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...
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...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Related Experiment Video

Updated: Jun 23, 2026

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood
11:17

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood

Published on: October 12, 2012

[Hypersensitivity reaction and Chinese heparin].

A Désormeaux1, N Montpas, A Adam

  • 1Faculté de pharmacie, université de Montréal, Montréal, Canada.

Annales Pharmaceutiques Francaises
|May 19, 2009
PubMed
Summary

Severe hypersensitivity reactions linked to contaminated heparin activate the plasma contact system. This study parallels these reactions with those seen during hemodialysis or blood transfusions in patients taking angiotensin converting enzyme inhibitors.

Related Experiment Videos

Last Updated: Jun 23, 2026

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood
11:17

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood

Published on: October 12, 2012

Area of Science:

  • Pharmacology
  • Immunology
  • Biochemistry

Context:

  • Severe hypersensitivity reactions have been reported following the bolus injection of heparin.
  • Heparin contamination with oversulfated chondroitin sulphate has been identified as a causative agent.
  • This contaminant activates the plasma contact system, leading to adverse events.

Purpose:

  • To investigate the pathophysiology of hypersensitivity reactions.
  • To draw parallels between heparin-induced reactions and those occurring during specific medical procedures.
  • To explore the role of angiotensin converting enzyme inhibitors in modulating these reactions.

Summary:

  • Oversulfated chondroitin sulphate in heparin triggers severe hypersensitivity reactions by activating the plasma contact system.
  • The study compares the mechanisms of these acute side effects with hypersensitivity reactions observed during hemodialysis.
  • Similarities are also drawn with reactions during blood product transfusions in patients treated with angiotensin converting enzyme inhibitors.

Impact:

  • Provides insights into the mechanisms of drug-induced hypersensitivity.
  • Highlights potential risks associated with contaminated heparin and specific patient populations.
  • Informs clinical practice regarding patient monitoring and management during hemodialysis and transfusions.