Pulmonary Function tests Flashcards
In obstructive what is the predicted FEV1
<80% - decreased
In restrictive what is the predicted FEV1
<80% - decreased
In obstructive what is the FVC predicted
reduced but not the same degree as FEV1
In rescrictive what is the FVC predicted
<80% - devreased
In obstructive what is the FEV1/FVC
<0.7 - decreased
In restrictive what is the FEV1/FVC
> =0.7 - normal
What does the FEV1/FVC ratio measure?
The FEV1/FVC ratio measures the forced expiratory volume in 1 second (FEV1) divided by the forced vital capacity (FVC)
What might decreased FEV1 or PEF post-exercise indicate?
Could suggest asthma.
What test measures Relaxed Vital Capacity?
spirometry
What might a decrease in SaO2 during exercise indicate?
Might indicate interstitial lung disease.
In obstructive and restrictive what happens to the overall ratio?
Why?
Obstructive - decreased
Rescrtive - normal
In obstructive lung diseases, both FEV1 and FVC are decreased, with FEV1 declining more than FVC, leading to a decreased FEV1/FVC ratio
In restrictive lung diseases, FVC is reduced while FEV1 remains relatively normal, resulting in a normal or increased FEV1/FVC ratio
What occurs with the diffusing Capacity of the Lungs for Carbon Monoxide (DLCO) in obstructive and restrictive lung diseases?
Obstructive - decreased in emphysema. Normal in asthma
Rescrictive - decreased
What are the gas diffuson tests ?
- DLCO - Measures gas diffusion across the alveolar-arteriolar barrier (single breath diffusing capacity)
- ABGs - at rest
- SaO2 during exercise
Examples of obstructive lung disease
Asthma
COPD
Bronchiectasis
Examples of restrictive lung disease
Pulmonary fibrosis
Asbestosis
Sarcoidosis
Acute respiratory distress syndrome
Infant respiratory distress syndrome
Kyphoscoliosis e.g. ankylosing spondylitis
Neuromuscular disorders
Severe obesity
