In the case of a 15-year-old asthma patient in moderate distress with no improvement, which delivery method should be selected for heliox therapy?

Heliox therapy, a mixture of helium and oxygen, is particularly useful in managing asthma exacerbations due to its ability to reduce airway resistance and improve gas flow in narrowed airways. When considering delivery methods for a 15-year-old patient in moderate distress who has not responded to initial treatments, the non-rebreather mask is the most effective option.

This delivery method ensures high concentrations of heliox, thereby maximizing the therapeutic benefits for the patient. The non-rebreather mask allows for a continuous flow of the heliox mixture, which helps maintain adequate oxygen saturation while also providing the benefits of helium. The mask creates a sealed environment that prevents the dilution of the heliox, delivering a high concentration of the gas mixture directly to the patient.

In cases of acute respiratory distress, it is crucial to opt for a delivery method that provides both high oxygen concentration and effective reduction of airway resistance. The non-rebreather mask accomplishes this, making it the most suitable choice for a patient exhibiting significant respiratory distress.