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Related Concept Videos

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...
Rh Blood Group01:19

Rh Blood Group

The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.
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...
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: 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...
Rheumatic Heart Disease I: Introduction01:23

Rheumatic Heart Disease I: Introduction

Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...

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Related Experiment Video

Updated: Jun 30, 2026

Flow Cytometric Measurement Of ROS Production In Macrophages In Response To FcγR Cross-linking
13:20

Flow Cytometric Measurement Of ROS Production In Macrophages In Response To FcγR Cross-linking

Published on: March 7, 2019

Reactive hemophagocytic syndrome.

L Rajam1, Vinitha Prasad, B L Yatheesha

  • 1Department of Pediatrics, Amrita Institute of Medical Sciences and Research Center, Kochi, Kerala, India.

Indian Journal of Pediatrics
|September 24, 2008
PubMed
Summary
This summary is machine-generated.

Reactive Hemophagocytic syndrome (RHS) can manifest in childhood rheumatic diseases like Juvenile Idiopathic Arthritis and Systemic Lupus Erythematosus. Prompt treatment with pulse methylprednisolone therapy led to recovery in both reported cases.

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Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
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Published on: June 6, 2011

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Flow Cytometric Measurement Of ROS Production In Macrophages In Response To FcγR Cross-linking
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Published on: March 7, 2019

Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
16:31

Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock

Published on: June 6, 2011

Area of Science:

  • Pediatric Rheumatology
  • Hematology
  • Immunology

Background:

  • Reactive Hemophagocytic syndrome (RHS) is a severe, life-threatening hyperinflammatory condition.
  • RHS is increasingly recognized as a potential complication in various pediatric rheumatic diseases.
  • Early diagnosis and prompt management are crucial for improving outcomes in pediatric RHS.

Observation:

  • Two pediatric cases of RHS associated with rheumatic diseases are presented.
  • Case 1: Adolescent with systemic onset Juvenile Idiopathic Arthritis (JIA) presented with sepsis-like symptoms, shock, liver dysfunction, and coagulopathy.
  • Case 2: Patient presented with cardiac tamponade and was diagnosed with Systemic Lupus Erythematosus (SLE), with bone marrow biopsy showing hemophagocytosis.

Findings:

  • Both patients exhibited distinct clinical presentations of RHS.
  • Hemophagocytosis was a key finding in the bone marrow aspirate of the SLE patient.
  • Both cases demonstrated significant clinical improvement following treatment with pulse methylprednisolone therapy.

Implications:

  • This highlights the importance of considering RHS in children with rheumatic diseases presenting with severe systemic symptoms.
  • Pulse methylprednisolone therapy appears effective in managing RHS in this pediatric population.
  • Further research into the pathogenesis and optimal management strategies for RHS in pediatric rheumatic diseases is warranted.