A 27-year-old woman received from the emergency department is on a nasal cannula at 5 L/min. Approximately what FiO2 is this patient receiving?
a. 28%
b. 32%
c. 35%
d. 40%
ANS: D
Estimating the FiO2 provided by low-flow systems: For patients with a normal rate and depth of breathing, each liter per minute of nasal O2 increases the FiO2 approximately 4%. For example, a patient using a nasal cannula at 4 L/min has an estimated FiO2 of approximately 37% (21 + 16).
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