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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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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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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 Reactions02:06

Allergic Reactions

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Overview
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Drug Toxicity: Allergic Reactions01:30

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...
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Skin Diseases and Disorders01:23

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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.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
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Allergic Drug Reactions01:27

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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Basophil Activation Test for Allergy Diagnosis
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Urticaria.

Bettina Wedi1, Dorothea Wieczorek, Ulrike Raap

  • 1Department for Dermatology, Allergology, and Venereology, Hannover Medical School, Germany.

Journal Der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG
|October 3, 2014
PubMed
Summary
This summary is machine-generated.

Urticaria, a common skin condition, requires further research into its causes and treatments. Current guidelines offer a stepwise approach, with omalizumab showing promise for difficult cases, though its exact mechanism remains unclear.

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Area of Science:

  • Dermatology
  • Immunology
  • Allergy

Background:

  • Urticaria is a prevalent skin condition with a long history, yet its pathogenesis and management present ongoing challenges.
  • Despite its commonality, scientific evidence regarding urticaria is relatively scarce compared to other dermatological diseases.
  • The underlying mechanisms of mast cell and basophil activation leading to urticarial symptoms like wheals and angioedema are not fully understood for most subtypes.

Purpose of the Study:

  • To highlight the complexity of urticaria subtypes, differentiating between spontaneous and inducible forms.
  • To emphasize the difficulties in managing chronic urticaria and specific populations such as children and pregnant women.
  • To underscore the importance of updated international guidelines and treatment algorithms for chronic spontaneous urticaria.

Main Methods:

  • Review of current international consensus and updated urticaria guidelines.
  • Analysis of the established three-step treatment algorithm for chronic spontaneous urticaria.
  • Examination of the role and approval status of omalizumab in urticaria management.

Main Results:

  • The current treatment algorithm for chronic spontaneous urticaria primarily utilizes second-generation H1-antihistamines as the first-line therapy.
  • Omalizumab has gained approval in numerous countries as a third-line treatment option for chronic spontaneous urticaria unresponsive to H1-antihistamines.
  • The precise mechanism of action of omalizumab in treating urticaria is still under investigation.

Conclusions:

  • Further elucidation of omalizumab's mechanism could significantly advance the understanding of urticaria pathogenesis.
  • Investigating these mechanisms may pave the way for novel therapeutic strategies for urticaria.
  • Continued research is crucial for improving the management of this common and often challenging skin disease.