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Hypersensitivity Reactions: Immune-Complex Reactions01:19

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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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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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Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...
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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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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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Vesicular Contact Reaction May Progress into Erythema Multiforme.

Magdalena Czarnecka-Operacz1, Dorota Jenerowicz, Joanna Szulczyńska-Gabor

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Erythema multiforme, a severe skin reaction, can be triggered by allergic contact dermatitis. This case highlights formaldehyde as a potential allergen, emphasizing the need for thorough patch testing after surgical procedures.

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Area of Science:

  • Dermatology
  • Allergology
  • Immunology

Background:

  • Erythema multiforme (EM) is an acute, self-limiting skin condition often linked to infections or medications.
  • Allergic contact dermatitis (ACD) is a delayed hypersensitivity reaction to cutaneous allergens.
  • The association between EM and ACD, particularly post-surgery, warrants further investigation.

Observation:

  • A patient developed widespread erythematous and vesicular lesions post-cesarean section, evolving into an EM-like eruption.
  • Initial treatment with antihistamines and corticosteroids was insufficient; cyclosporine A and intravenous acyclovir were administered.
  • Histopathological examination suggested a bullous form of EM (dermal type).

Findings:

  • Patch testing revealed polyvalent contact allergy, including to a surgical skin disinfectant containing formaldehyde.
  • Formaldehyde is known to potentially cause erythema multiforme-like eruptions.
  • The pathomechanism linking ACD to EM is complex, possibly involving T-cell-mediated reactions or immune complexes.

Implications:

  • This case underscores the importance of comprehensive allergological diagnostics, including patch testing, in patients presenting with EM-like eruptions post-surgery.
  • Identifying specific allergens like formaldehyde can guide preventative strategies and improve patient management.
  • Further research into the immunological mechanisms connecting ACD and EM is crucial for understanding and treating these conditions.