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Related Concept Videos

Asthma I: Introduction01:28

Asthma I: Introduction

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...
Asthma-II: Pathophysiology and Classification01:26

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
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Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Factors Affecting Pulmonary Ventilation01:19

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
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Asthma-I: Introduction01:29

Asthma-I: Introduction

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Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
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Mechanical determinants of airways hyperresponsiveness.

Jason H T Bates1, Geoffrey N Maksym

  • 1Vermont Lung Center, University of Vermont College of Medicine, Burlington, VA 05405-0075, USA. jason.h.bates@uvm.edu

Critical Reviews in Biomedical Engineering
|October 21, 2011
PubMed
Summary

Airway hyperresponsiveness (AHR) in asthma is linked to airway smooth muscle (ASM) shortening. This review examines the mechanical factors, including forces, loads, and geometry, that contribute to AHR in severe asthma.

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Area of Science:

  • Respiratory Medicine
  • Biophysics
  • Pulmonary Physiology

Background:

  • Asthma is characterized by airway hyperresponsiveness (AHR), leading to breathing difficulties.
  • AHR involves excessive pulmonary airway narrowing due to airway smooth muscle (ASM) contraction.
  • The precise mechanisms driving AHR in asthmatics are complex and debated.

Purpose of the Study:

  • To review the mechanical factors influencing airway hyperresponsiveness (AHR).
  • To explore the interplay between forces, loads, and geometry in ASM-induced airway narrowing.
  • To elucidate the contribution of mechanical factors to severe asthma.

Main Methods:

  • Review of existing literature on airway mechanics in asthma.
  • Analysis of spatial configuration and physical forces within the pulmonary airways.
  • Categorization of mechanical factors into active forces, mechanical loads, and geometric transformation.

Main Results:

  • Mechanical factors are crucial for understanding AHR.
  • Three key groups of mechanical factors influence airway narrowing: active forces, mechanical loads, and geometric transformation of ASM shortening.
  • These factors likely interact to cause AHR in severe asthma.

Conclusions:

  • Mechanical factors, encompassing forces, loads, and geometry, are central to airway hyperresponsiveness (AHR).
  • The interplay of these factors significantly contributes to the pathophysiology of asthma, particularly in severe cases.
  • Further understanding of these mechanical elements is vital for managing asthma.