Which of the following is considered a limitation of the high-flow nasal cannula?
a. It does not meet patient's flow needs.
b. The amount of airway positive pressure cannot be measured.
c. It does not provide for appropriate CO2 clearance.
d. It does not reduce the use of noninvasive positive-pressure ventilation.
ANS: B
Instead of titrating levels of CPAP, the flow rate is incrementally adjusted; however, the amount of positive pressure that the high-flow nasal cannula potentially produces cannot be measured and inadvertent high levels may occur, particularly if the nasal cannula fits snugly in the nares.
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