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Related Concept Videos

Inhalational Anesthetics: Overview01:20

Inhalational Anesthetics: Overview

Inhalation anesthetics are drugs that induce general anesthesia upon inhalation. They work by increasing the sensitivity of GABAA receptors or inhibiting NMDA receptors, leading to a decrease in central nervous system activity. The depth of anesthesia can be rapidly adjusted by changing the concentration of the inhaled gas. Some common examples of inhalational anesthetics include volatile liquids like isoflurane, desflurane, sevoflurane and gases like xenon and nitrous oxide. Isoflurane, a...
Inhaled Medications01:23

Inhaled Medications

Inhaled medications are crucial for managing chronic obstructive pulmonary disease (COPD) and asthma. They are essential for effective treatment and control, ensuring optimal respiratory health and well-being. Inhaled medication delivers drugs directly to the lungs, providing a rapid onset of action and reducing systemic side effects compared to oral or injectable medications. Three primary types of inhalation devices are used to administer these medications: nebulizers, metered-dose inhalers...

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Related Experiment Video

Updated: Jun 7, 2026

Dry Powder and Nebulized Aerosol Inhalation of Pharmaceuticals Delivered to Mice Using a Nose-only Exposure System
07:28

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Published on: April 6, 2017

Inhalation provocation tests using nonisotonic aerosols.

C M Smith1, S D Anderson

  • 1Department of Thoracic Medicine, Royal Prince Alfred Hospital, Camperdown, Australia.

The Journal of Allergy and Clinical Immunology
|November 1, 1989
PubMed
Summary
This summary is machine-generated.

Inhaled non-isotonic aerosols, like water and saline, can objectively measure asthma severity by assessing bronchial hyperresponsiveness. This method reveals responses to endogenously released mediators, offering clinical insights.

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Last Updated: Jun 7, 2026

Dry Powder and Nebulized Aerosol Inhalation of Pharmaceuticals Delivered to Mice Using a Nose-only Exposure System
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Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles
05:07

Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles

Published on: March 18, 2019

Area of Science:

  • Pulmonary Medicine
  • Allergy and Immunology
  • Respiratory Physiology

Background:

  • Bronchial hyperresponsiveness measurement is key to assessing asthma severity.
  • Commonly used agents like methacholine and histamine induce airway narrowing via smooth muscle contraction.
  • Asthma attacks can be triggered by inhaling aerosols that alter airway fluid osmolarity.

Purpose of the Study:

  • To evaluate the utility of non-isotonic aerosols in assessing bronchial hyperresponsiveness.
  • To explore the mechanisms by which osmolarity changes trigger mediator release and airway narrowing.
  • To discuss the clinical implications of identifying responsiveness to non-isotonic aerosols.

Main Methods:

  • Inhalational challenge with non-isotonic aerosols (e.g., water, hyperosmolar saline).
  • Comparison of airway responses to non-isotonic aerosols with other bronchial provocation tests.
  • Analysis of techniques, equipment, and aerosol selection for non-isotonic challenges.

Main Results:

  • Non-isotonic aerosols may provoke asthma attacks by altering airway osmolarity.
  • Changes in airway osmolarity are linked to the release of inflammatory mediators.
  • Airway narrowing mechanisms induced by non-isotonic aerosols are considered.

Conclusions:

  • Inhalational challenge with non-isotonic aerosols offers an objective method for assessing asthma severity.
  • This technique may be useful for evaluating bronchial hyperresponsiveness to endogenously released mediators.
  • Understanding responsiveness to these aerosols has significant clinical implications for asthma management.