A patient with pneumonia and underlying COPD is being mechanically ventilated in the VC-CMV mode with VT 650 mL. The resulting PaCO2 is 62 mm Hg. What change should be made to the VT to obtain a desired PaCO2 of 50 mm Hg for this patient?
a. 400 mL
b. 800 mL
c. 1000 mL
d. 1200 mL
ANS: B
Desired VT ??Known PaCO2 ⋅?Known VT / Desired PaCO2
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