A neonate is reported to have classic Stage IV BPD with emphysematous lung changes. What pulmonary function test finding(s) would confirm this?
1. Increased RV/TLC ratio
2. Increased FRC
3. Decreased VC
4. Increased RV
a. 3
b. 1, 2
c. 2, 3, 4
d. 1, 2, 4
D
Emphysematous lung changes would cause overinflation and be identified by an increased RV/TLC ratio, an increased functional residual capacity (FRC), and increased residual volume (RV).
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