What is a normal PFT result?
If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65). When compared to the reference value, a lower measured value corresponds to a more severe lung abnormality. (See table below.)
How do you interpret spirometry results?
Interpretations of spirometry results require comparison between an individual’s measured value and the reference value. If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65).
What is a significant bronchodilator response?
A significant bronchodilator response was defined as an increase in FEV1 (or FVC) of 12% (and 200 mL or greater) (5). If a patient had multiple spirometric tests, the most recent test results were recorded.
How to interpret the results of pulmonary function test?
Understand the physiology of the core pulmonary function tests: spirometry, lung volumes and DLCO 3. Apply an organized approach to interpreting pulmonary function tests 4. Identify obstructive, restrictive, mixed obstructive-restrictive and pulmonary vascular patterns of abnormalities on pulmonary function testing.
How are lung function tests used to diagnose asthma?
Based on these lung function tests, your suspicion that this patient has asthma is: a. Decreased, normal lung function test rules out asthma b. Unchanged, her clinical history is suggestive and many patients with asthma have normal spirometry c. I can’t tell as a bronchodilator response was not assessed PFTS TO EVALUATE FOR ASTHMA
What are the lung volume patterns on PFTS?
Obesity LUNG VOLUMES- PATTERNS TO DIFFERENTIATE RESTRICTIVE DISEASE Cause of Restriction Pattern of lung volume abnormality Intrinsic Lung Disease (interstitial lung disease, pulmonary fibrosis) Low VC and low RV Neuromuscular Disease Low VC and high RV Chest wall restriction (kyphoscoliosis) Low VC and low RV Obesity Low FRC and low ERV
What kind of pulmonary disease is low FRC?
Intrinsic Lung Disease (interstitial lung disease, pulmonary fibrosis) Low VC and low RV Neuromuscular Disease Low VC and high RV Chest wall restriction (kyphoscoliosis) Low VC and low RV Obesity Low FRC and low ERV CASE 3: A 77 Y/O MAN WITH DYSPNEA AND HYPOXEMIA