Which of the following values are indicative of acute respiratory failure and the need for venti-latory 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(A?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
ANS: B
The critical values for the parameters listed are: maximum inspiratory pressure (MIP) −20 to 0; vital capacity (VC) <10-15 mL/kg ideal body weight (IBW); alveolar to arterial partial pressure [P(A-a)O2] >450 on O2, and maximum expiratory pressure (MEP) <40 cm H2O.
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