What is a disadvantage of using a bag valve mask (BVM)?

Using a bag valve mask (BVM) effectively typically requires two rescuers for optimal performance. This is because one rescuer is needed to maintain a proper seal on the mask while the other squeezes the bag to provide ventilations. A good seal is crucial to ensure that the air being delivered goes into the lungs rather than escaping around the mask. When one rescuer attempts to accomplish both tasks alone, it can lead to inadequate ventilation and a risk of ineffective resuscitation. Therefore, the necessity for two rescuers is a significant disadvantage, as it can limit the usability of the BVM in situations where a single rescuer is available, such as in a solitary rescue scenario.

Options indicating higher oxygen concentrations, the ability to use the BVM by a single rescuer, and the versatility for all ages highlight advantages of the device rather than its limitations.