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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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, heparin),...
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Allergic Drug Reactions01:27

Allergic Drug Reactions

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 numerous...
Pharmacovigilance01:19

Pharmacovigilance

Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
Drug Toxicity: Allergic Reactions01:30

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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...

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Related Experiment Video

Updated: Jul 9, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

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Published on: May 31, 2021

Practical allergy (PRACTALL) report: risk assessment in anaphylaxis.

F E R Simons1, A J Frew, I J Ansotegui

  • 1Department of Pediatrics & Child Health, University of Manitoba, Winnipeg, MB, Canada.

Allergy
|December 7, 2007
PubMed
Summary

This review examines anaphylaxis effector mechanisms and diagnostic methods. It highlights improved techniques for differentiating allergen sensitization from clinical anaphylaxis risk and future assessment strategies.

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Area of Science:

  • Immunology
  • Allergy and Clinical Immunology
  • Emergency Medicine

Background:

  • Anaphylaxis is a severe allergic reaction requiring accurate diagnosis.
  • Distinguishing allergen sensitization from clinical anaphylaxis is challenging.
  • Current diagnostic methods have limitations in risk assessment.

Purpose of the Study:

  • To review effector mechanisms in anaphylaxis.
  • To discuss current diagnostic confirmation approaches.
  • To explore improved methods for risk assessment in anaphylaxis.

Main Methods:

  • Literature review of anaphylaxis effector mechanisms.
  • Discussion of diagnostic confirmation strategies.
  • Description of innovative risk assessment techniques.

Main Results:

  • Effector mechanisms of anaphylaxis were comprehensively reviewed.
  • Current diagnostic approaches were critically evaluated.
  • Methods to differentiate sensitization from clinical risk were deliberated.

Conclusions:

  • Accurate diagnosis of anaphylaxis is crucial.
  • Improved methods are needed to distinguish sensitization from clinical risk.
  • Future innovative techniques will enhance anaphylaxis risk assessment.