Which of the Following Values Are Indicative of Acute Respiratory

Multiple Choice

Which of the following values are indicative of acute respiratory failure and the need for ventilatory support?
1) Maximum inspiratory pressure (MIP) = −38 cm H₂O.
2) Vital capacity (VC) = 650 mL for a 70 kg male.
3) Alveolar-to-arterial partial pressure of oxygen [P₍ᴀ₋ₐ₎O₂] = 150 on 100% oxygen.
4) Maximum expiratory pressure (MEP) = 25 cm H₂O.

A) 1 and 2 only
B) 2 and 4 only
C) 1 and 3 only
D) 3 and 4 only