What is the primary function of an air-entrainment mask?

The primary function of an air-entrainment mask is to deliver a controlled mixture of air and oxygen. This device is designed to provide specific concentrations of oxygen to patients, ensuring consistent and reliable delivery. By using the principle of venturi effect, the air-entrainment mask draws a set amount of room air in along with oxygen. The proportion of air to oxygen can be adjusted by changing the size of the entrainment ports, allowing healthcare providers to tailor the oxygen concentration to meet the patient's needs.

This capability of delivering a precise mixture is particularly important in clinical settings where maintaining target oxygen saturation levels is crucial, especially in conditions such as chronic obstructive pulmonary disease (COPD) or in acute respiratory distress. Hence, the ability to control the ratio of air to oxygen accurately makes this mask effective for managing patients requiring supplemental oxygen without the risks associated with providing high concentrations of oxygen.