What characteristic of Heliox allows it to improve gas flow in obstructed airways?

The characteristic of Heliox that allows it to improve gas flow in obstructed airways is its low density. Heliox is a mixture of helium and oxygen, and the helium component has a significantly lower density compared to air. This reduced density means that Heliox can move more easily and quickly through narrowed or obstructed airways, effectively decreasing the work of breathing and facilitating better ventilation.

In conditions like asthma or chronic obstructive pulmonary disease (COPD), where airway obstructions are common, the low density of Heliox enhances airflow dynamics, helping to alleviate respiratory distress. The lighter molecules of helium allow for a smoother flow past obstructions compared to the denser gases that comprise air, making Heliox particularly beneficial in respiratory therapy situations where improving ventilation is crucial.