What is the function of exhalation ports in NIV masks?

The function of exhalation ports in noninvasive ventilation (NIV) masks is primarily to facilitate proper gas exchange and the elimination of carbon dioxide (CO2) during exhalation. These ports enable the exhaled gases to escape, preventing CO2 rebreathing, which is crucial for maintaining appropriate levels of oxygen in the blood and ensuring effective ventilation. By allowing exhaled air to be expelled from the mask, exhalation ports help to improve the overall efficiency of respiratory support provided by the NIV system.

Effective gas exchange is key to treating conditions like acute respiratory failure, where monitoring and removing excess CO2 are critical for patient safety and comfort. Additionally, these ports contribute to maintaining a flow of fresh gas that can help increase oxygen saturation levels for the patient receiving NIV support.