Why is Heliox used for upper and lower airway obstructions?

Heliox is a therapeutic mixture of helium and oxygen that is particularly useful in the management of upper and lower airway obstructions. The primary reason for its effectiveness lies in its low density, which significantly reduces airway resistance. This reduction in resistance enhances gas flow through constricted airways, allowing for more efficient ventilation.

By utilizing a gas mixture that includes helium—an inert gas with lower density than air—doctors can help improve the delivery of oxygen to the lungs, especially in conditions where airway narrowing or obstruction occurs. For example, in situations such as asthma exacerbations or croup, the use of Heliox can help decrease the work of breathing and alleviate respiratory distress.

While the other options reference important aspects of respiratory physiology, they do not specifically address the direct benefit that Heliox provides in overcoming the issues related to airway obstructions.