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Hypersensitivity Reactions: Immune-Complex Reactions

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 Reactions

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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 exposure to a...

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

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...

Hypersensitivity Reactions: Cytolytic Reactions

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Hypersensitivities

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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.
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

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Metal hypersensitivity: can it mimic infection?

Ashish Anand¹, Fred McGlynn, William Jiranek

¹Deparment of Orthopedics, VCU Medical centre, Richmond, Virginia, USA.

The Journal of Arthroplasty

|July 22, 2008

Summary

Metal hypersensitivity, though rare, can cause medical hardware rejection. Suspecting this allergy is crucial to avoid prolonged diagnostic procedures and ensure correct patient management.

Area of Science:

Orthopedic Surgery
Materials Science
Allergy Immunology

Background:

Orthopedic implants are common for treating bone fractures and joint diseases.
Metal alloys are frequently used in orthopedic hardware due to their strength and biocompatibility.
While generally safe, adverse reactions to implant materials can occur.

Observation:

A rare case of metal hypersensitivity leading to orthopedic hardware rejection is presented.
The patient experienced a prolonged and challenging diagnostic journey.
Infection was initially suspected and ruled out as the cause.

Findings:

Metal hypersensitivity, although infrequent, can manifest as hardware rejection.
Failure to consider metal allergy can result in extensive, non-diagnostic testing.

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Prompt identification of metal hypersensitivity is key to resolving unexplained implant issues.

Implications:

Clinicians should consider metal hypersensitivity in the differential diagnosis for unexplained implant complications.
Early identification of metal allergy can prevent unnecessary invasive procedures.
This case underscores the importance of material biocompatibility in orthopedic device design and patient selection.