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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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Allergic Reactions: Anaphylaxis01:30

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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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Accessory Structures of the Skin: Hair and Hair Follicles01:16

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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
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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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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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Granulocyte-dependent Autoantibody-induced Skin Blistering
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Aquagenic Urticaria: A Perplexing Physical Phenomenon.

Cindy Wassef, Anacristina Laureano, Robert A Schwartz1

  • 1Professor Robert A Schwartz MD, MPH, DSc (Hon), FRCP Edin Dermatology Rutgers New Jersey Medical School, 185 South Orange Avenue H-576, Newark, New Jersey 07103; roschwar@cal.berkeley.edu.

Acta Dermatovenerologica Croatica : ADC
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PubMed
Summary
This summary is machine-generated.

Aquagenic urticaria (AQ) is a rare skin condition triggered by water contact. This review covers its symptoms, diagnosis, and treatment options for this water allergy.

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Area of Science:

  • Dermatology
  • Allergology
  • Immunology

Background:

  • Aquagenic urticaria (AQ) is a rare physical urticaria.
  • It is triggered by water contact, irrespective of temperature or source.
  • The underlying mechanism of mast cell degranulation is not fully understood.

Purpose of the Study:

  • To review the clinical presentation of aquagenic urticaria.
  • To discuss diagnostic parameters and differential diagnosis.
  • To outline current treatment strategies for AQ.

Main Methods:

  • Literature review of aquagenic urticaria.
  • Analysis of clinical characteristics.
  • Synthesis of diagnostic and therapeutic information.

Main Results:

  • AQ typically presents as 1-2 mm folliculopapular lesions on the trunk and upper extremities within 20-30 minutes of water exposure.
  • Symptoms include mild to severe pruritus and a burning sensation.
  • Differential diagnosis includes cholinergic urticaria.

Conclusions:

  • Aquagenic urticaria presents with characteristic clinical features.
  • Further research is needed to elucidate the exact mechanism of water-induced mast cell degranulation.
  • Management involves symptomatic treatment and avoidance of water triggers where possible.