Pulmonary Function Testing
Case 7
A 73 year-old man presents with progressive dyspnea on exertion over the past one year. He reports a dry cough but no wheezes, sputum production, fevers or hemoptysis. He is a life-long non-smoker and worked as a lawyer until retiring 3 years ago. He likes to hunt and fish in his leisure time.
His pulmonary function testing is as follows:
| Pre-Bronchodilator (BD) | |||
|---|---|---|---|
| Test | Actual | Predicted | % Predicted |
| FVC (L) | 1.57 | 4.46 | 35 |
| FEV1 (L) | 1.28 | 3.39 | 38 |
| FEV1/FVC (%) | 82 | 76 | |
| FRC | 1.73 | 3.80 | 45 |
| RV (L) | 1.12 | 2.59 | 43 |
| TLC (L) | 2.70 | 6.45 | 42 |
| RV/TLC (%) | 41 | 42 | |
| DLCO* corr | 5.06 | 31.64 | 16 |
| *DLCO is measured in ml/min/mmHg | |||
| Check abbreviations>> | |||
His flow volume loops 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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