What is a risk associated with delivering oxygen above 6 L/min via a nasal cannula?

Delivering oxygen above 6 L/min via a nasal cannula can lead to the drying out of the nasal mucosa. When high-flow oxygen is delivered, especially at rates above 6 L/min, the oxygen flow can create a turbulent airflow that can strip moisture from the nasal passages. This drying effect can cause discomfort, irritation, and potential damage to the sensitive mucus membranes within the nasal cavity.

Proper humidity is crucial when administering supplemental oxygen, as it helps maintain mucosal integrity and function. If moisture is not adequately maintained, patients may experience symptoms such as dryness, a burning sensation, or even nosebleeds, making it important for healthcare providers to monitor and manage the humidity of the oxygen delivered. This is why it's critical to consider the flow rate and provide additional humidification for patients receiving high levels of oxygen through a nasal cannula.