Which of the Following Would Suggest That a Patient Is

Which of the following would suggest that a patient is ready to be weaned from a ventilator?

A) Vital capacity (VC) of 8 mL/kg ideal body weight (IBW)
B) PₐCO₂ or 65 mm Hg on and FɪO₂ of 0.6
C) Dead space-to-tidal volume ratio (Vᴅ/Vᴛ) of 0.75
D) Rapid shallow breathing index of 75 breaths/min/L