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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: 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:...
Adrenergic Agonists: Therapeutic Classification01:18

Adrenergic Agonists: Therapeutic Classification

Adrenergic agonists can be classified based on their therapeutic uses and mechanisms of action. They serve various purposes in clinical applications.
Vasopressor or pressor agents: They increase blood pressure and function as cardiac stimulants. Examples include endogenous catecholamines (norepinephrine and dopamine) and synthetic agents (phenylephrine).
Bronchodilators: β2-agonists can relax bronchial muscles and widen airways. They are commonly used for treating obstructive pulmonary...
Asthma-IV: Diagnostic and Management01:30

Asthma-IV: Diagnostic and Management

The diagnosis and management of asthma are comprehensive, encompassing clinical assessments, lung function tests, and pharmacological interventions. Here's an overview:
Clinical Assessment for Asthma:
This is the first step in diagnosing and managing asthma. It includes:
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.
Bronchodilators, the first step of respiration enhancement, come in various forms, each with its own mechanism...
Antihypertensive Drugs: Types of β-Blockers01:28

Antihypertensive Drugs: Types of β-Blockers

β receptors are classified into three subclasses: β1, β2, and β3. β1 receptors are primarily located in the heart and kidneys. When they get activated, they increase heart rate, contractility, and renin release. This process enhances blood pressure and aids in stress management. In contrast, β2 receptors are situated mainly in the lungs, blood vessels, and skeletal muscles. Upon activation, they trigger smooth muscle relaxation, causing bronchodilation and vasodilation. This widens airways and...

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Bronchial Thermoplasty: A Novel Therapeutic Approach to Severe Asthma
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Published on: November 4, 2010

Beta₂-agonists for exercise-induced asthma.

Matteo Bonini1, Corrado Di Mambro, Moises A Calderon

  • 1Department of Public Health and Infectious Diseases, "Sapienza" University, Rome, Italy.

The Cochrane Database of Systematic Reviews
|October 4, 2013
PubMed
Summary

Single-dose beta2-agonists effectively prevent exercise-induced asthma (EIA) in children and adults. However, long-term use of these medications can lead to tolerance and reduced effectiveness, with limited safety data available.

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Home-Based Prescribed Pulmonary Exercise in Patients with Stable Chronic Obstructive Pulmonary Disease
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Bronchial Thermoplasty: A Novel Therapeutic Approach to Severe Asthma
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Published on: November 4, 2010

Home-Based Prescribed Pulmonary Exercise in Patients with Stable Chronic Obstructive Pulmonary Disease
07:10

Home-Based Prescribed Pulmonary Exercise in Patients with Stable Chronic Obstructive Pulmonary Disease

Published on: August 24, 2019

Area of Science:

  • Pulmonology
  • Pharmacology
  • Exercise Physiology

Background:

  • Exercise can trigger asthma symptoms and bronchoconstriction, known as exercise-induced asthma (EIA).
  • Beta2-agonists are recommended for asthma management, but their efficacy and safety for EIA pretreatment remain debated.
  • EIA encompasses exercise-induced asthma and exercise-induced bronchoconstriction, regardless of underlying asthma diagnosis.

Purpose of the Study:

  • To evaluate the effectiveness and safety of inhaled short-acting beta2-agonists (SABA) and long-acting beta2-agonists (LABA) versus placebo for EIA pretreatment in children and adults.

Main Methods:

  • Systematic review and meta-analysis of randomized, double-blind, placebo-controlled trials.
  • Included studies assessed inhaled beta2-agonists for EIA in adults and children, with clear diagnostic criteria.
  • Searches of the Cochrane Airways Group Specialised Register and respiratory journals up to August 2013.

Main Results:

  • Fifty-three trials with 1139 participants were included.
  • Single-dose SABA and LABA demonstrated significant bronchoprotective effects against EIA compared to placebo (mean difference in FEV1 fall: -17.67%).
  • No significant difference in side effect occurrence was observed; however, long-term use of SABA and LABA led to tolerance and reduced efficacy.

Conclusions:

  • Low to moderate quality evidence supports the efficacy and safety of single-dose SABA and LABA for preventing EIA.
  • Long-term regular administration of inhaled beta2-agonists may induce tolerance and lacks sufficient safety data, particularly for LABA monotherapy.
  • Clinical relevance lies in the potential for overuse of beta2-agonists for EIA pretreatment despite safety concerns.