Which of the following pre/post bronchodilator pulmonary function test results is the most meaningful in suggesting that a bronchodilator is indicated? A. FEV1 increases by 150 mL B. FEF 200-1200 increases by 17% C. FEV1.0/FVC % increases by 10%. D. FVC increases from 2.5 L to 2.6 L
Question
Which of the following pre/post bronchodilator pulmonary function test results is the most meaningful in suggesting that a bronchodilator is indicated? A. FEV1 increases by 150 mL B. FEF 200-1200 increases by 17% C. FEV1.0/FVC % increases by 10%. D. FVC increases from 2.5 L to 2.6 L
Solution
The most meaningful result suggesting that a bronchodilator is indicated would be C. FEV1.0/FVC % increases by 10%.
Here's why:
A bronchodilator is a substance that dilates the bronchi and bronchioles, decreasing resistance in the respiratory airway and increasing airflow to the lungs. They are most commonly used in conditions like asthma and chronic obstructive pulmonary disease (COPD).
The pulmonary function tests (PFTs) mentioned in the options are used to assess how well your lungs work.
A. FEV1 (Forced Expiratory Volume in 1 second) is the amount of air you can force from your lungs in one second. An increase of 150 mL is not significant enough to suggest the need for a bronchodilator.
B. FEF 200-1200 (Forced Expiratory Flow) is the average rate of flow during the middle half of the FVC maneuver. An increase of 17% is also not significant enough to suggest the need for a bronchodilator.
C. FEV1.0/FVC % is the ratio of FEV1 to FVC. An increase in this ratio by 10% after using a bronchodilator suggests that the airways responded to the medication, indicating that the bronchodilator is beneficial.
D. FVC (Forced Vital Capacity) is the total amount of air exhaled during the FEV test. An increase from 2.5 L to 2.6 L is not significant enough to suggest the need for a bronchodilator.
Therefore, option C is the most meaningful result in suggesting that a bronchodilator is indicated.
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