Question

Surgical removal of one lung reduces the 

A. FEV₁ by about 10 per cent. 

B. Percentage saturation of arterial blood with oxygen. 

C. Exercise tolerance. 

D. Residual volume. 

E. Ventilation/perfusion ratio by about 50 per cent.

Answer 1

A. False It reduces it by at least half. 

B. False A single lung can maintain normal oxygenation at rest. 

C. True Maximum ventilation and maximum oxygen uptake are reduced. 

D. True It leads to a restrictive lung disease pattern. 

E. False The ratio is little affected.