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FEV1/FVC < 70%
Obstruction
-
-
FEV1/FVC < 70% and FVC normal, then no significant improvement after bronchodilator
COPD
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FEV1/FVC < 70% and FVC normal, then FEV1 or FVC increased by 15% or FEF-25-75 increased by 30% after bronchodilator
Asthma
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FEV1/FVC is < 70% and FVC < 80%, and TLC < 80% predicted?
obstructive and restrictive disease
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FEV1/FVC is < 70% and FVC < 80%, and TLC > 120% predicted?
hyperinflation
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FEV1/FVC is < 70% and FVC < 80%, and TLC normal with increased RV?
air trapping, obstructive disease
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Obstructive with hyperinflation and decreased DLCO?
emphysema
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Obstruction with hyperinflation and normal ( or sometimes increased ) DLCO
asthma
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Obstruction with normal lung volumes and normal DLCO
chronic bronchitis
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Restriction with low RV and decreased DLCO?
scarring diseases (sarcoidosis, diffuse interstitial fibrosis, berryliosis, collagen vascular disease)
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Restriction with normal RV (or increased) and normal DLCO?
- Neuromuscular diseases
- kyphosis
- scoliosis
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Isolated low DLCO?
- anemia
- Pulmonary vascular disease (PE)
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