Pulmonary Function Test Interpretation

The video tutorial explains how to interpret Pulmonary Function Data (PFD) by examining key metrics such as FEC, FEV1, and DLCO. It guides viewers through diagnosing restriction or obstruction, assessing obstruction severity using GOLD stages, and determining reactivity. The tutorial also covers distinguishing between extrinsic and intrinsic lung diseases using DLCO and alveolar ventilation ratios.

What is the first step in interpreting PFDs?

• Check the total lung capacity

• Check if FVC is greater than 80% of predicted

• Check the FEV1/FVC ratio

• Check the DLCO

If the FVC is less than 80% of predicted, what are the possible conditions?

• Only obstruction

• Normal lung function

• Obstruction with air trapping or restriction

• No restriction

What does an FEV1/FVC ratio greater than 0.7 indicate?

• Air trapping

• No obstruction

• Restriction

• Obstruction

If the total lung capacity is less than 80% of predicted, what does it indicate?

• No restriction

• Obstruction with air trapping

• Normal lung function

• Restriction

Which GOLD stage corresponds to an FEV1% predicted of 30 to 50?

• Stage 1

• Stage 4

• Stage 2

• Stage 3

What criteria define reactivity in obstruction?

• DLCO change of greater than 12% and 200 milliliters post bronchodilator

• Total lung capacity change of greater than 12% and 200 milliliters post bronchodilator

• FEV1 or FVC change of less than 12% and 200 milliliters post bronchodilator

• FEV1 or FVC change of greater than 12% and 200 milliliters post bronchodilator

What does a DLCO greater than 80% of predicted indicate?

• Restriction

• Obstruction

• Normal membrane surface area

• Abnormal membrane surface area

What condition is indicated by a DLCO/VA ratio greater than 80% of predicted?

• Obstruction

• Extrinsic lung disease

• Restriction

• Intrinsic lung disease

What is an example of an intrinsic lung disease?

• Pulmonary fibrosis

• Scoliosis

• Obesity

• Guillain-Barre syndrome

What is the next step if the FEV1/FVC ratio is less than 0.7?

• Check the FVC

• Check the total lung capacity

• Check the DLCO

• Check the bronchodilator response