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Allergic Reactions02:06

Allergic Reactions

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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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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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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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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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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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Measuring Local Anaphylaxis in Mice
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Iatrogenic pseudoanaphylaxis.

R Patterson, M S Dykewicz, J M Perry

    The Journal of Allergy and Clinical Immunology
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    A nurse experienced ocular exposure to chymopapain and was treated for anaphylaxis. However, analysis suggests a vasovagal reaction, not true anaphylaxis, highlighting diagnostic challenges in occupational exposures.

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    Area of Science:

    • Allergy and Immunology
    • Occupational Health
    • Clinical Medicine

    Background:

    • Accidental ocular exposure to chymopapain occurred in a nurse.
    • The nurse received vigorous treatment for suspected chymopapain anaphylaxis.

    Observation:

    • Clinical events were retrospectively analyzed.
    • No evidence of IgE antibodies against chymopapain was found.
    • Symptoms were inconsistent with anaphylaxis.

    Findings:

    • The clinical presentation was more consistent with a vasovagal reaction.
    • Cardiorespiratory effects from epinephrine administration were noted.
    • The patient was assessed to be in good health post-event.

    Implications:

    • This case highlights diagnostic challenges in differentiating allergic reactions from other causes like vasovagal responses in occupational settings.
    • It underscores the importance of thorough retrospective analysis for accurate diagnosis.
    • The case also touches upon patient adherence to medical advice and the legal considerations in medical case reports.