What are the common Heliox mixtures?

Heliox is a medical gas mixture that combines helium (He) and oxygen (O₂), primarily used in clinical settings for patients with airway obstructions like asthma or chronic obstructive pulmonary disease (COPD). The benefits of using heliox stem from helium's low density, which decreases airway resistance and allows easier breathing for patients with compromised airflow.

The common heliox mixtures typically consist of varying proportions of helium and oxygen. Mixtures such as 70% helium with 30% oxygen or 80% helium with 20% oxygen are common because they effectively reduce the density of the gas mixture while still providing sufficient oxygen for patient needs. The ratios in these mixtures are carefully selected to maintain adequate oxygen levels while leveraging the properties of helium to facilitate easier gas flow in the respiratory system.

Using a mixture like 70% He + 30% O₂ provides a balance that optimizes the benefits of heliox therapy, making it more effective for managing respiratory distress in affected patients. Thus, the identified correct answer reflects the typical concentrations used in clinical practice for heliox mixtures, ensuring both the therapeutic gas is delivered effectively and the patient’s oxygenation needs are met.