To Determine Whether There Is a Positive Response to Bronchodilator

Multiple Choice

To determine whether there is a positive response to bronchodilator therapy, improvement must be seen in which of the following values?
1) FVC
2) FEV₁
3) FEF_{25% to 75%}
4) FEF_{75% to 85%}

A) 1 and 4
B) 2 and 3
C) 1, 2, and 3
D) 2, 3, and 4