PFT TMC exam style example and explination

A patient’s pulmonary function results are:

%of predicted

  • SVC 61
  • FVC     63
  • FEV1 83
  • FEV1/FVC% 81
  • DLCO 26

What is most likely this patient’s condition?

  1. Chronic Bronchitis
  2. Asthma
  3. The patient doesn’t have a restrictive or obstructive condition
  4. Pulmonary fibrosis

The correct answer is 4- pulmonary fibrosis

The first thing we want to look at is the FEV1/FVC% and FEV1, both are normal so there is no obstructive disorder. An abnormal FEV1/FVC% is<70, an abnormal FEV1 is below 80.

After we look a the FEV1FVC% and FEV1 look at the SVC and FVC, both are low indicating a restrictive disorder. The only restrictive disorder that is an option is pulmonary fibrosis.

PFT TMC Example style question

A patient’s pulmonary function results are:

%of predicted

  • SVC 85
  • FVC 82
  • FEV1 72
  • FEV1/FVC% 61
  • DLCO 18

Which is the patient’s disease?

  1. Pulmonary Fibrosis
  2. Asthma
  3. Emphysema
  4. Myasthenia gravis

The correct answer is 3.  The FEV1 and FEV1/ FVC make it obstructive (FEV1/FVC <75% and FEV1 <80%)  Asthma is also an obstructive disorder but emphysema is the only obstructive disorder that has a decreased DLCO.