Answer to Question 1
ANS: A
Excessive amounts of oxygen can cause a patient with chronically elevated CO2 levels to hypoventilate because the oxygen can knock out the patient's hypoxic drive. The oxygen con-centration delivered can vary significantly and may cause ventilatory depression in patients with chronically elevated partial pressure of arterial CO2 (PaCO2) levels.
Answer to Question 2
ANS: C
The FIO2 increases approximately 4 for each liter of flow increase. If we begin with 20, then 5 L/min 4 = 20. And 20 + 20 = 40.