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Oscillometry-Defined Small Airway Dysfunction in Patients with Chronic Obstructive Pulmonary Disease
Amit K Rath1, Dibakar Sahu1, Sajal De1
1Department of Pulmonary Medicine, All India Institute of Medical Sciences, Raipur, India.
Tuberculosis and Respiratory Diseases
|January 15, 2024
Summary
Small airway dysfunction (SAD) is common in all chronic obstructive pulmonary disease (COPD) stages, increasing with severity. SAD correlates with worse lung function and higher symptom burden in COPD patients.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Small airway dysfunction (SAD) prevalence in chronic obstructive pulmonary disease (COPD) patients across ethnicities is not well-defined.
- This study aimed to determine the prevalence of SAD in stable COPD patients.
Purpose of the Study:
- To estimate the prevalence of small airway dysfunction (SAD) in stable patients with chronic obstructive pulmonary disease (COPD).
Main Methods:
- A cross-sectional study involving 196 stable COPD patients.
- Lung function and respiratory impedance were measured pre- and post-bronchodilator (BD).
- SAD was defined by specific criteria for respiratory resistance and reactance.
Main Results:
- SAD prevalence increased with COPD severity (GOLD grades 1-4: 14.3% to 100%).
- Post-BD SAD was found in 62.8% of patients.
- SAD was linked to poorer lung function, higher COPD Assessment Test (CAT) scores, and reduced exercise capacity.
Conclusions:
- Small airway dysfunction (SAD) is prevalent in all COPD severities and escalates with disease progression.
- SAD is associated with diminished lung function and increased symptom burden.
- Expiratory flow limitation at tidal breath (EFLT) indicates severe SAD.
Keywords:
COPD Assessment Test ScoreChronic Obstructive Pulmonary DiseaseExpiratory Flow Limitation at Tidal BreathsOscillometrySmall Airway DysfunctionMore Related Videos
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