The respiratory therapist has been called to place a 70-kg male patient with ARDS on ventilatory support. The physician has requested a respiratory rate of 20/min. Which of the following would be an appropriate VT for this patient?
a. 140 ml
b. 200 ml
c. 350 ml
d. 700 ml
ANS: C
The currently acceptable tidal volume for a mechanically ventilated patient with ARDS in acute respiratory failure is 4 to 8 ml/kg. Therefore, the VT must be set between 280 (70 kg ? 4 ml/kg) and 560 ml (70 kg ? 8 ml/kg).
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