I was wondering what other EMTs prefer to use. I was reading up on the airway chapter and I saw an interesting comparison between the two. I would think the best method is to use a BVM based on the ability to use oxygen if available. However, say someone with a basic jump bag came upon an apneic patient as a first responder and they had both a pocket mask with one way valve or a BVM to choose from. My book said that manual artificial respiration gives about 16% oxygen per ventilation while a BVM gives 21%. But the manual would give you more tidal volume. So is it better to have more oxygen or have more air going through the lungs? I would think more oxygen would seem like the better option.