Obstructive Lung Disease
February 15th, 2021
Overview
A reduced ;FEV₁:FVC ratio of <0.7 is diagnostic of obstructive lung disease.
Pulmonary Function Test Findings
- FEV₁ reduced (<80% predicted)
- FVC mildly reduced
- FEV₁:FVC ratio reduced (<0.7)
- 'Scooped' or 'dipped' flow-volume loop
Causes of Obstructive Disease
- COPD
- Asthma
- Bronchiectasis
- Cystic fibrosis
- Bronchiolitis
- α1-antitripsin deficiency
Severity of Obstructive Disease
Based on FEV₁:- Mild - >70% predicted
- Moderate - 60-69% predicted
- Moderately severe - 50-59% predicted
- Severe - 35-49% predicted
- Very severe - <35% predicted
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