You have just placed a chronic obstructive pulmonary disease (COPD) patient on intermittent mandatory ventilation at a rate of 8/min, a VT of 550 ml, and an FiO2 of 0.40
To ensure proper equilibration between the alveolar and arterial gas tensions, how long should you wait before drawing a sample for measurement of the ABG?
a. 5 min
b. 10 min
c. 15 min
d. 30 min
ANS: D
ABGs should be measured 20 to 30 min after initiation of mechanical ventilation.
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