Pulmonary Function Test Interpretation

The video tutorial explains how to interpret Pulmonary Function Tests (PFDs) by analyzing Forced Vital Capacity (FVC), FEV1/FVC ratio, and Total Lung Capacity (TLC). It covers identifying restriction and obstruction, classifying obstruction severity, and understanding DLCO in lung diseases. The tutorial also discusses the importance of reactivity in obstruction and provides a comprehensive review of the interpretation process.

What is the first step in interpreting a PFT according to the video?

• Check the FEV1/FVC ratio

• Assess the Total Lung Capacity

• Determine the DLCO

• Evaluate the Forced Vital Capacity

If the FEV1/FVC ratio is greater than 0.7, what can be concluded?

• There is obstruction

• There is no obstruction

• There is restriction

• There is air trapping

What does a Total Lung Capacity less than 80% of predicted indicate?

• Restriction

• Normal lung function

• Obstruction with air trapping

• Increased lung capacity

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

• Stage 2

• Stage 4

• Stage 3

• Stage 1

What is the ATS criteria for airway reactivity?

• No change in FEV1 or FVC

• FEV1 or FVC change of exactly 12% and 200 ml

• FEV1 or FVC change of greater than 12% and 200 ml

• FEV1 or FVC change of less than 12% and 200 ml

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

• Intrinsic lung disease

• Abnormal membrane surface area

• Extrinsic lung disease

• Normal membrane surface area

How can you differentiate between extrinsic and intrinsic lung diseases using DLCO?

• By evaluating the DLCO divided by alveolar ventilation

• By assessing the Total Lung Capacity

• By checking if DLCO is greater than 80% of predicted

• By measuring the FEV1/FVC ratio

What condition is indicated by a DLCO divided by alveolar ventilation greater than 80%?

• Normal lung function

• Obstruction with air trapping

• Extrinsic lung disease

• Intrinsic lung disease

What is the significance of a forced vital capacity greater than 80% of predicted?

• Indicates air trapping

• Indicates no restriction

• Indicates restriction

• Indicates obstruction

What should be done after diagnosing obstruction in PFT interpretation?

• Check the DLCO

• Determine the severity and reactivity

• Reassess the FEV1/FVC ratio

• Evaluate the Total Lung Capacity