A 28-year-old female (55-kg IBW)is being mechanically ventilated with VC-CMV,f = 14/min,Vᴛ = 700 mL.The patient has no history of pulmonary disease.The resulting ABG values are: pH 7.55,PₐCO₂ 27 mm Hg,HCO₃⁻ 23 mEq/L.The most appropriate action to take is which of the following?

Question

Quizplus · Accepted Answer

The original volume setting exceeded the maximum Vᴛ for this patient.The Vᴛ should be set between 275 and 440 mL to achieve 5-8 mL/kg IBW.Therefore,the Vᴛ must be reduced to avoid overdistention.Using the formula:
Desired Vᴛ = Known PaCO₂ × Known Vᴛ / Desired PaCO₂
Desired Vᴛ = 473 mL
The Vᴛ of 450 mL is closest to the desired Vᴛ and is more in line with the acceptable range.

A 28-Year-Old Female (55-Kg IBW)is Being Mechanically Ventilated with VC-CMV,f