Question

Which of the following pre/post bronchodilator pulmonary function test results is the most meaningful in suggesting that a bronchodilator is indicated?

Answer 1

The most meaningful pre/post bronchodilator pulmonary function test result to suggest that a bronchodilator is indicated is the ratio of FEV1 to FVC. In lung fibrosis, this ratio increases indicating the need for a bronchodilator.

Step-by-step explanation:

The most meaningful pre/post bronchodilator pulmonary function test result to suggest that a bronchodilator is indicated is the ratio of FEV1 (forced expiratory volume in one second) to FVC (forced vital capacity). This ratio is measured during spirometry and is used to diagnose lung diseases such as asthma, emphysema, and fibrosis.

In lung fibrosis, the lungs become less pliable, causing a decrease in the FEV1/FVC ratio. Therefore, an increase in this ratio would suggest that a bronchodilator is indicated to help improve lung function.

This can be seen in Figure 30.18, where the FEV1/FVC ratio is lower in persons with obstructive lung disease (less than 69 percent) than in persons with restrictive disease (88 to 90 percent).