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Related Concept Videos

Antiasthma Drugs: β2-Adrenoceptor Agonists01:25

Antiasthma Drugs: β2-Adrenoceptor Agonists

Bronchodilators are critical in managing asthma, a chronic respiratory condition characterized by airway constriction due to inflammation and hyper-reactivity. Specifically, bronchodilators ease this constriction by relaxing the bronchial muscles, facilitating easier breathing.
One class of bronchodilators includes β2-adrenoceptor agonists. These agents target the β2-adrenoceptors located on bronchial smooth muscle cells. By stimulating these receptors, β2-agonists induce relaxation in these...
Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
Adrenergic Agonists: Therapeutic Uses01:30

Adrenergic Agonists: Therapeutic Uses

Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
Allergies and anaphylaxis:...
Antiasthma Drugs: Muscarinic Receptor Antagonists01:20

Antiasthma Drugs: Muscarinic Receptor Antagonists

Muscarinic receptor antagonists, also known as antimuscarinic agents, are a class of bronchodilators used to treat asthma, although they are more commonly used to treat COPD. They work by inhibiting the action of acetylcholine (ACh), a neurotransmitter, on muscarinic receptors found in the airways.
Antimuscarinic agents compete with ACh for the same binding site on the muscarinic receptors. By binding to these receptors, they inhibit the downstream effects of ACh and block the parasympathetic...
Antiasthma Drugs: Leukotriene Modifiers01:19

Antiasthma Drugs: Leukotriene Modifiers

Leukotriene modifiers, or cysteinyl leukotriene receptor antagonists, are medications used to manage chronic asthma. These agents target specific inflammatory mediators produced during arachidonic acid metabolism, an essential process in generating inflammation in the body.
Leukotriene modifiers work through two distinct mechanisms:
COPD: Management Using Bronchodilators and Corticosteroids01:26

COPD: Management Using Bronchodilators and Corticosteroids

Chronic obstructive pulmonary isease (COPD) involves a group of progressive lung disorders characterized by persistent airflow limitation and chronic respiratory symptoms. Asthma-COPD Overlap Syndrome (ACOS), encompassing features of both asthma and Chronic obstructive pulmonary disease (COPD), is a group of progressive lung disorders that includes chronic bronchitis, emphysema, and refractory (non-reversible) asthma. ACOS leads to complex clinical presentations that combine the inflammatory...

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Related Experiment Video

Updated: Jul 5, 2026

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
06:11

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults

Published on: February 9, 2022

Paradoxical response to levalbuterol.

Sarah E Broski1, Dennis E Amundson

  • 1Pulmonary and Critical Care Department, Naval MedicalCenter San Diego, San Diego, Calif., USA.

The Journal of the American Osteopathic Association
|April 30, 2008
PubMed
Summary
This summary is machine-generated.

Levalbuterol, used to treat asthma, can paradoxically cause bronchoconstriction. This case report details an instance in a new-onset asthma patient, challenging the assumption that levalbuterol is free from this adverse effect.

Related Experiment Videos

Last Updated: Jul 5, 2026

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
06:11

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults

Published on: February 9, 2022

Area of Science:

  • Pulmonology
  • Pharmacology
  • Clinical Medicine

Background:

  • Asthma management often involves beta-adrenergic agonists.
  • Paradoxical bronchospasm is a known adverse effect of some asthma medications.
  • Levalbuterol hydrochloride, the R-stereoisomer of albuterol, was developed to minimize such adverse effects.

Observation:

  • A 36-year-old male with new-onset asthma was treated with levalbuterol.
  • The patient experienced paradoxical bronchoconstriction despite treatment with levalbuterol.

Findings:

  • This case demonstrates that levalbuterol can induce paradoxical bronchoconstriction.
  • The R-stereoisomer is not entirely devoid of the potential for this adverse effect.

Implications:

  • Clinicians should remain vigilant for paradoxical bronchoconstriction even when using levalbuterol.
  • Further investigation may be needed to understand the mechanisms underlying levalbuterol-induced paradoxical bronchoconstriction.
  • Patient monitoring for adverse effects remains crucial in asthma management.