Final answer:
A nasal cannula typically has a maximum flow rate of 6 liters per minute, as higher rates may cause nasal discomfort and are not generally needed.
Step-by-step explanation:
The maximum flow rate to be used with a nasal cannula is 6 liters per minute. This limitation is due to the need to prevent drying out the nasal mucosa and irritation, as well as to provide a sufficient but not excessive amount of oxygen. Higher flow rates can lead to discomfort and are usually not necessary for a stable patient. For higher oxygen requirements, other devices such as masks or high flow nasal cannula may be indicated. This is the recommended flow rate to deliver oxygen effectively without causing discomfort or nasal dryness. It is important to use the appropriate flow rate based on the patient's needs and condition.