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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

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Overview
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Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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

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

Hypersensitivity Reactions: Immune-Complex Reactions

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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...
218
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Hypersensitivity Reactions: Cytolytic Reactions01:01

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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: Apr 16, 2026

Author Spotlight: Modeling an Aspect of Preeclampsia in Female Mice Using Hypoxic Human Placenta-Derived Small Extracellular Vesicles
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Anaphylaxis-induced hyperfibrinolysis in pregnancy.

H T Truong1, R M Browning1

  • 1Department of Anaesthesia, King Edward Memorial Hospital, Subiaco, WA, Australia.

International Journal of Obstetric Anesthesia
|March 22, 2015
PubMed
Summary

Anaphylaxis in pregnancy is a rare, life-threatening emergency. This case highlights anaphylaxis-induced hyperfibrinolysis, a complication that can worsen postpartum bleeding and complicate resuscitation efforts.

Keywords:
AnaesthesiaAnaphylaxisHyperfibrinolysisPregnancyROTEMThromboelastometry

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Area of Science:

  • Obstetrics and Gynecology
  • Anesthesiology
  • Critical Care Medicine

Background:

  • Anaphylaxis during pregnancy presents significant risks to both mother and fetus.
  • Potential complications include airway obstruction, bronchospasm, cardiac arrest, and the need for perimortem cesarean delivery.

Observation:

  • A rare case of anaphylaxis during pregnancy is presented.
  • The patient experienced anaphylaxis-induced hyperfibrinolysis, a seldom-discussed complication.

Findings:

  • Anaphylaxis-induced hyperfibrinolysis can significantly increase the risk of postpartum hemorrhage.
  • This coagulopathy can impede critical resuscitative measures during obstetric emergencies.

Implications:

  • Awareness of hyperfibrinolysis as a complication of anaphylaxis in pregnancy is crucial for anesthesiologists and obstetricians.
  • Prompt recognition and management are essential to improve maternal and fetal outcomes in these high-risk scenarios.