Which statement about pop-off valves on bag-valve-masks is true?

• A. Every BVM has an adjustable valve with clearly labeled setting
• B. Not all BVMs have adjustable pop-off; some are fixed
• C. The pop-off valve can be permanently removed
• D. The valve should be replaced after every use

Answer: (B)

Pop-off valves act as a safety release to prevent excessive airway pressure during bag-valve-mask ventilation. The key idea here is that not all devices offer the same feature: some BVMs have an adjustable pop-off valve, allowing you to set how much pressure must build before it vents, while others have a fixed valve that cannot be changed. Therefore, the statement that not all BVMs have adjustable pop-offs—some are fixed—is the true one. This matters because with adjustable valves you can tailor ventilation to the patient and situation, whereas fixed valves rely on your technique to control the delivered pressure. Removing the valve or replacing it after every use aren’t standard practices: removal would defeat the safety purpose, and routine replacement after each use isn’t how these devices are normally managed—valves are replaced or serviced according to manufacturer guidelines and clinical protocols.