Pulmonary Function Testing
Case 6
A 30 year-old woman presents for evaluation of dyspnea on exertion which has been present for 2 months. She is a life-long non-smoker with no prior history of asthma or other pulmonary problems. She works as a receptionist at a publishing company. She has two cats and several parakeets at home.
Her pulmonary function testing is as follows:
| Pre-Bronchodilator (BD) | Post- BD | ||||
|---|---|---|---|---|---|
| Test | Actual | Predicted | % Predicted | Actual | % Change |
| FVC (L) | 1.73 | 4.37 | 40 | 1.79 | 4 |
| FEV1 (L) | 1.57 | 3.65 | 43 | 1.58 | 0 |
| FEV1/FVC (%) | 91 | 84 | 88 | - 3 | |
| RV (L) | 1.01 | 1.98 | 51 | ||
| TLC (L) | 2.68 | 6.12 | 44 | ||
| RV/TLC (%) | 38 | 30 | |||
| DLCO* corr | 5.13 | 32.19 | 16 | ||
| *DLCO is measured in ml/min/mmHg | |||||
| Check abbreviations>> | |||||
Her 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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