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Related Concept Videos

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...
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Imaging Studies I: CT and MRI01:14

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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Computed Tomography (CT) scan:
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Drug Toxicity: Allergic Reactions01:30

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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...
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Radiological Investigation I: X-ray and CT01:30

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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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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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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Related Experiment Video

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An Aptamer-based Sensor for Unchelated GadoliniumIII
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Hypersensitivity reactions to gadolinium-based contrast agents.

Jie Shen Fok1, William B Smith

  • 1aDepartment of General Medicine bDepartment of Clinical Immunology and Allergy, Flinders Medical Centre, Bedford Park cDepartment of Clinical Immunology and Allergy, Royal Adelaide Hospital, Adelaide, South Australia, Australia.

Current Opinion in Allergy and Clinical Immunology
|May 25, 2017
PubMed
Summary

Gadolinium-based contrast agents (GBCAs) rarely cause hypersensitivity reactions, such as urticaria or anaphylaxis. Prompt recognition and management of these reactions are crucial for patient safety.

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Area of Science:

  • Radiology
  • Immunology
  • Clinical Medicine

Background:

  • Gadolinium-based contrast agents (GBCAs) are widely used in MRI to improve diagnostic accuracy.
  • While generally safe, immediate hypersensitivity reactions can occur, with urticaria being the most common manifestation.

Purpose of the Study:

  • To review the incidence of hypersensitivity reactions associated with GBCAs.
  • To identify potential risk factors for these reactions.
  • To discuss diagnostic approaches and management strategies.

Main Methods:

  • Literature review of GBCA hypersensitivity reactions.
  • Analysis of reported incidence and clinical presentations.
  • Discussion of diagnostic testing, including skin testing.

Main Results:

  • Immediate hypersensitivity reactions to GBCAs are infrequent but can be severe, including anaphylaxis.
  • Emerging evidence suggests an IgE-mediated mechanism for some reactions.
  • Skin testing can aid in confirming causality and identifying cross-reactivity.

Conclusions:

  • GBCA hypersensitivity, though uncommon, requires clinical awareness for prompt management.
  • Familiarity with managing acute reactions can be life-saving.
  • Diagnostic testing can guide future patient care and management decisions.