Low-flow O2 delivery systems used in respiratory care include which of the following? 1. Nasal O2 cannula 2. Nasal O2 catheter 3. Air-entrainment mask 4. Transtracheal catheter
a. 1 and 3 only
b. 1, 2, and 4 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
Low-flow O2 delivery systems include the nasal cannula, the nasal catheter, and the transtracheal catheter.
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