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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
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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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Chronic Obstructive Pulmonary Disease II: Emphysema01:23

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Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography
08:58

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Methacholine-induced airway hyper-reactivity phenotypes.

Eric J Gartman1, Ernest K Dinino, Patrick Koo

  • 1Division of Pulmonary, Critical Care, and Sleep Medicine, Warren Alpert School of Medicine of Brown University, Pawtucket, RI, USA. eric_gartman@brown.edu

The Journal of Asthma : Official Journal of the Association for the Care of Asthma
|April 12, 2013
PubMed
Summary
This summary is machine-generated.

Measuring airway conductance during methacholine challenge tests (MCT) is crucial. A significant decline in specific airway conductance (sGaw) alone indicates a clinically important asthma phenotype, similar to FEV(1) decline.

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Clinical Diagnostics

Background:

  • Standard methacholine challenge tests (MCT) often omit airway conductance/resistance measurements, relying solely on spirometry.
  • The clinical significance of a significant decline in specific airway conductance (sGaw) without a concurrent drop in forced expiratory volume in one second (FEV(1)) is not well-defined.

Purpose of the Study:

  • To define the clinical and physiologic phenotypes of individuals exhibiting a ≥40% sGaw decline but <20% FEV(1) change during MCT.
  • To investigate the importance of incorporating airway conductance and resistance into MCT protocols.

Main Methods:

  • Subjects underwent the Asthma Quality of Life Questionnaire (AQLQ).
  • Standard MCT was performed with measurements of sGaw.
  • Impulse oscillation system (IOS) was used for independent measurements of resistance and reactance pre- and post-MCT.

Main Results:

  • Of 201 subjects, 45 (22.4%) showed a significant sGaw decline (≥40%) with no significant FEV(1) drop (Group 2).
  • Group 2 exhibited similar changes in oscillometric parameters and sGaw compared to Group 1 (≥20% FEV(1) decline).
  • Groups 1 and 2 showed no differences in AQLQ scores but were statistically different from Group 3 (no significant decline).

Conclusions:

  • A significant sGaw decline during MCT represents a clinically and physiologically important hyper-reactivity phenotype.
  • Excluding airway conductance/resistance measurements may lead to misdiagnosis, potentially ruling out asthma in ~20% of referred patients.
  • Standardizing MCT protocols to include body plethysmography and/or IOS is recommended.