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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
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),...
Hypersensitivities01:30

Hypersensitivities

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.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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...
Cross-reactivity00:42

Cross-reactivity

Overview

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Updated: Jun 1, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Differential diagnosis in allergy.

Robert J Stachler1, Samer Al-khudari

  • 1Department of Otolaryngology Head and Neck Surgery, Henry Ford Health Systems, Detroit, MI, USA. rstachl1@hfhs.org

Otolaryngologic Clinics of North America
|May 31, 2011
PubMed
Summary
This summary is machine-generated.

Otolaryngic allergists must differentiate nonallergic conditions mimicking allergies. This guide helps clinicians identify these diseases for accurate head and neck condition management.

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Published on: June 4, 2017

Area of Science:

  • Otolaryngology
  • Allergy and Immunology

Background:

  • Accurate diagnosis of allergic conditions in the head and neck is crucial for effective patient management.
  • Many nonallergic diseases present symptoms similar to allergic reactions, complicating diagnosis.
  • Distinguishing between allergic and nonallergic conditions is a key challenge for otolaryngic allergists.

Purpose of the Study:

  • To outline common nonallergic diagnoses that mimic allergic conditions in head and neck patients.
  • To equip clinicians with the knowledge to rule out nonallergic diseases before diagnosing allergies.
  • To improve the prompt and efficient management of both allergic and nonallergic head and neck diseases.

Main Methods:

  • Review of common nonallergic conditions presenting with symptoms similar to allergic diseases.
  • Discussion of differential diagnostic criteria for head and neck conditions.
  • Clinical guidance for identifying and managing nonallergic mimics.

Main Results:

  • Identification of several nonallergic conditions that require exclusion in the diagnostic process.
  • Enhanced ability for clinicians to differentiate between allergic and nonallergic etiologies.
  • Improved decision-making for patient treatment plans.

Conclusions:

  • Clinicians must consider a broad range of nonallergic diagnoses when evaluating patients with suspected allergies.
  • Accurate differentiation enhances the effectiveness of treatment strategies for head and neck diseases.
  • This knowledge supports precise diagnosis and management in otolaryngic allergy practice.