Which of the Following Is a Critical Value for the Key

Multiple Choice

Which of the following is a critical value for the key clinical indicators in hypercapnic respiratory failure in an adult?
1) pH 7.25
2) Ventilatory rate ≥ 35 breaths/min
3) MIP ≤ -25 cm HVentilatory rate O
4) VD/VT 40%

A) 1
B) 2
C) 1, 2
D) 3, 4