Spirometry Question
Key:
- FEV1: Forced expiratory volume in one second- the volume of air exhaled during the first second of a forced exhalation
- FVC: The total amount of air exhaled during a forced exhalation
Question:
(select the appropriate words to complete the text below)
| The patient is asked to take a maximum inspiration, followed by a forced expiration into the spirometer |
|
The spirometer records the volume of gas exhaled in one second:
and the total volume of exhaled gas: |
| Normally the FEV1/FVC ratio is around |
| In obstructive lung diseases airflow is limited, so FEV1 falls proportionately than FVC therefore the FEV1/FVC ratio is |
| In restrictive lung diseases FEV1 and FVC are proportionately, so the ratio is |
