What is the function of a non-rebreathing mask in heliox therapy?

The function of a non-rebreathing mask in heliox therapy is primarily to ensure the delivery of a helium and oxygen mix. In heliox therapy, the combination of helium and oxygen helps to reduce the density of the gas mixture, making it easier for patients to breathe, especially in conditions causing airway obstruction or increased work of breathing.

The non-rebreathing mask, designed with one-way valves, allows the patient to inhale this specialized gas mixture while preventing the exhaled gas from entering the reservoir bag. This setup helps maintain a consistent mixture of helium and oxygen, optimizing the therapeutic benefits of heliox by allowing for efficient gas exchange and improved airflow.

While the mask also contributes to reducing the work of breathing and minimizing carbon dioxide retention by providing a high flow of gas, its primary purpose in this context is facilitating the effective delivery of the helium-oxygen blend, which is crucial for treating specific respiratory conditions.