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Related Concept Videos

Drugs Used in Lower Respiratory Disorders: Overview01:17

Drugs Used in Lower Respiratory Disorders: Overview

Lower respiratory tract disorders present challenges that often require skilled and nuanced approaches for effective management. Common ailments, such as asthma and chronic obstructive pulmonary disease (COPD), have prompted the development of intricate treatment strategies involving bronchodilators and anti-inflammatory drugs, each tailored to ease breathing and revitalize the lungs.
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Asthma: Pathogenesis and Management01:20

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Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs01:25

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Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
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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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Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...

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Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples
11:54

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Differences in mediator release between allergic rhinitis and asthma.

S Lam1, S al-Majed, H Chan

  • 1Department of Medicine, Vancouver General Hospital, University of British Columbia, Canada.

The Journal of Allergy and Clinical Immunology
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

Allergic asthma patients release more airway mediators like histamine after allergen exposure compared to allergic rhinitis patients. This suggests a key difference in allergic airway inflammation.

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Area of Science:

  • Allergy and Immunology
  • Respiratory Medicine
  • Cellular Biology

Background:

  • Patients with allergic rhinitis and allergic asthma exhibit distinct airway responses to inhaled allergens.
  • Understanding these differences is crucial for targeted therapeutic strategies.

Purpose of the Study:

  • To investigate the underlying mechanisms responsible for differential airway responses in allergic rhinitis versus allergic asthma.
  • To compare mediator release following antigen challenge in both patient groups.

Main Methods:

  • Bronchial lavage was performed on subjects with allergic asthma and allergic rhinitis before and after antigen inhalation challenge.
  • Levels of mediators such as histamine, thromboxane B2, and prostaglandin E2 were measured in lavage fluid.
  • Methacholine challenge was used to assess non-immunologic bronchoconstriction.

Main Results:

  • Subjects with asthma showed higher neutrophil counts in lavage fluid pre-challenge.
  • Asthma patients released significant amounts of histamine and thromboxane B2 post-challenge, unlike rhinitis patients.
  • Prostaglandin E2 levels increased in asthma patients after antigen challenge.
  • A correlation was observed between methacholine responsiveness and pre-challenge prostaglandin E2 levels.

Conclusions:

  • Allergic asthma patients demonstrate a greater capacity to release airway mediators upon antigen challenge compared to those with allergic rhinitis alone.
  • The study highlights distinct inflammatory pathways in allergic asthma.
  • Further research is needed to determine if increased mediator release is due to mast cell number or enhanced releasability.