When using nasal cannulae, the maximum oxygen flow rate that should be used is 6 litres/min. Why?
Nasal cannulae are only capable of delivering an inspired oxygen concentration between 24% and 40%
Forany given flow rate, the inspired oxygen concentration will vary between breaths, as it depends upon the rate and depth of the patient’s breath and the inspiratory flow rate.
Higher rates can cause nasal mucosal drying and may lead to epistaxis
If oxygen is administered at greater than 40% it should be humidified. You cannot humidify oxygen via nasal cannulae