NREMT Paramedic Exam 2026 – 400 Free Practice Questions to Pass the Exam

In a simple face mask, when the flow rate is set below 6 liters per minute, carbon dioxide can collect within the mask. This occurs because the mask does not fully deliver fresh oxygen and also traps exhaled air, which contains a higher concentration of carbon dioxide. High-flow rates are essential to maintain adequate ventilation and prevent the rebreathing of carbon dioxide.

At flow rates below the recommended threshold, the amount of oxygen delivered may not be sufficient to displace the exhaled gases effectively, leading to a buildup of carbon dioxide in the mask. This can create a hazardous situation for the patient, as rebreathing carbon dioxide can lead to respiratory acidosis or other complications. It's crucial to ensure that the flow rate is adequate to avoid these issues and to ensure proper oxygenation of the patient.