What are the medical uses of Heliox?

Heliox is a mixture of helium and oxygen and is primarily used for its unique physical properties that can benefit patients with certain respiratory conditions. The correct choice highlights that Heliox serves as a carrier gas for upper and lower airway obstruction.

When helium is combined with oxygen, it creates a low-density gas that can help reduce the work of breathing. This is especially beneficial for patients experiencing conditions like asthma, COPD, or any situation that leads to airway obstruction. The lighter weight of the gas allows it to flow more easily through constricted airways, thereby improving ventilation and aiding in the delivery of oxygen to the lungs.

In contrast, the other options do not appropriately align with the established medical uses of Heliox. For instance, while oxygen therapy is crucial for hypoxemia, Heliox specifically functions beyond just providing oxygen; it's about enhancing airway management in obstructed cases. Analgesia for minor procedures does not involve Heliox, as it does not have anesthetic properties. Lastly, while CNS stimulants can be important in certain medical contexts, Heliox does not play a role in CNS stimulation during apnea testing. Thus, the primary function of Heliox as a carrier gas for airway obstruction stands out as its most relevant medical application.