Which of the following devices could cause CO2 retention? 1. Simple mask 2. Aerosol face mask 3. Nonrebreathing mask 4. Air-entrainment mask
a. 1 and 3 c. 2 and 3
b. 1 and 2 d. 3 and 4
ANS: A
Carbon dioxide rebreathing can occur if the oxygen flow to a simple or nonrebreathing mask is not sufficient to wash out the patient's exhaled gases. The flow of oxygen to a reservoir mask determines the FIO2, as do the patient's breathing pattern and the presence or absence of a reser-voir bag. Those masks with a reservoir bag will have a higher FIO2 than those without a reservoir bag.
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