Pulmonary Function Testing
Case 4
A 25 year-old man presents to his physician with complaints of dyspnea and wheezing. He is a non-smoker. Two years ago, he was in a major motor vehicle accident and was hospitalized for 3 months. He had a tracheostomy placed because he remained on the ventilator for a total of 7 weeks. His tracheostomy was removed 2 months after his discharge from the hospital.
His pulmonary tests are as follows:
| Pre-Bronchodilator (BD) | |||
|---|---|---|---|
| Test | Actual | Predicted | % Predicted |
| FVC (L) | 4.73 | 4.35 | 109 |
| FEV1 (L) | 2.56 | 3.69 | 69 |
| FEV1/FVC (%) | 54 | 85 | |
| Check abbreviations>> | |||
His flow volume loop is as follows:
Describe the pattern of abnormality, if one is present.
Grade the severity of the abnormality.
Generate a differential diagnosis for the observed abnormality.
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