What fractional inspired oxygen (FIO2) setting should be set on ...

[luminitza]

What fractional inspired oxygen (FIO2) setting should be set on the ventilator when the patient currently has a partial pressure of oxygen (PaO2) of 53 mm Hg while receiving 50 oxygen and the desired PaO2 is 90 mm Hg?
 
  a. 0.64
  b. 0.74
  c. 0.85
  d. 0.95

Question 2

A mechanically ventilated patient is going to be placed on pressure support ventilation following an acceptable spontaneous weaning trial.
 
  The patient is a 5'9 male who weighs 185 lb. During volume-controlled continuous mandatory ventilation (VC-CMV) his average peak inspiratory pressure (PIP) was about 26 cm H2O and the plateau pressure (PPlateau) was 16 cm H2O. What initial pressure support level should be set?
  a. 5 cm H2O
  b. 10 cm H2O
  c. 15 cm H2O
  d. 20 cm H2O

[enass]

Answer to Question 1

ANS: C

Answer to Question 2

ANS: B
The easiest way to establish the initial setting for pressure support ventilation (PSV) is to set it equal to the transairway pressure (peak inspiratory pressure (PIP)  plateau pressure (Pplateau)).