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Nasal Cannulae are simple to use and emphasise patient convenience. They provide entrainment of ambient air through the nostrils.
The FiO2 achieved is proportional to:
At an oxygen flow rate of 2 l/min the oxygen concentration in the hypopharynx of a resting person is approx 28%, at 4 l/min it is 36%.
The Nasal Cannula prevents rebreathing and is comfortable for long periods of time.
There is increased patient compliance with the nasal cannula as patients are able to speak, eat or drink.
