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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),...
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...
Upper Respiratory Drugs: First and Second-Generation Antihistamines01:15

Upper Respiratory Drugs: First and Second-Generation Antihistamines

Antihistamines are a class of drugs widely used to alleviate the symptoms of allergies, such as sneezing, itching, and nasal congestion. They work by inhibiting the actions of histamine, which is released by immune cells in response to allergenic substances or tissue injuries.
Histamine binds to specific receptor sites, known as H1 receptors, on tissue cells, triggering inflammation and swelling. Antihistamines combat these effects by competing with histamine for these receptor sites. By...
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.
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Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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...

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Related Experiment Video

Updated: Jun 26, 2026

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber
08:47

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

Published on: March 3, 2023

[Allergies in ENT].

P De Rotalier1, M Faye, B Sissokho

  • 1Hôpital Principal de Dakar, service O.R.L & C.C.F.

Dakar Medical
|December 24, 2008
PubMed
Summary
This summary is machine-generated.

Allergies are common, with Ear, Nose, and Throat (ENT) symptoms often indicating a broader issue. Biological testing and affordable treatments in Africa can effectively diagnose and manage allergy cases.

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Last Updated: Jun 26, 2026

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A Component-resolved Diagnostic Approach for a Study on Grass Pollen Allergens in Chinese Southerners with Allergic Rhinitis and/or Asthma
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Area of Science:

  • Otolaryngology
  • Allergology
  • Immunology

Background:

  • Allergic diseases are prevalent, frequently manifesting with Ear, Nose, and Throat (ENT) symptoms.
  • Clinical examination for allergy is often limited, making patient history crucial.
  • ENT allergy can rarely pose life-threatening risks, necessitating prompt recognition.

Purpose of the Study:

  • To highlight the importance of allergy diagnosis in ENT conditions.
  • To discuss the utility of biological testing in allergy assessment.
  • To present cost-effective allergy management strategies in African settings.

Main Methods:

  • Review of diagnostic approaches for allergy, emphasizing patient history.
  • Discussion of biological testing methods for allergy detection.
  • Evaluation of test-treatment strategies using inexpensive medications in Africa.

Main Results:

  • Patient history is paramount in diagnosing allergy, as physical examination can be unrevealing.
  • Biological tests can aid in allergy diagnosis.
  • Affordable and safe test-treatment protocols in Africa provide strong evidence for allergy.

Conclusions:

  • Effective allergy management relies on thorough patient history and appropriate diagnostic tools.
  • Accessible and economical treatments are vital for allergy control, particularly in resource-limited regions.
  • Early detection and intervention for ENT allergy are crucial to prevent severe outcomes.