Oxygenation during one-lung ventilation

Oxygenation during one-lung ventilation may be improved by: 

A. Increasing the tidal volume to 15 ml/kg of body/wt 
B. Applying PEEP 5cm of H20. to the ventilated dependant. lung 
C. Maintaining CPAP 5 cm of H20. in the non- ventilated non-dependant. lung 
D. All of the above

Ans. D.  All of the above

CPAP applied to unventilated lung is usually effective in restoring adequate oxygenation during one lung ventilation when excessive pulmonary shunt develops 

Ventilation with differential PEEP to manipulate regional blood flow is also necessary. 

Maintaining CPAP 5 cm of Ho.  in the nonventilated lung also improves oxygenation during one lung ventilation. 

another potential MCQ asked from the same topic is:

-               m/c cause of hypoxia during one lung ventilation is: malposition, shunt, collapse of lung