Various techniques can be used by the EMT to provide artificial ventilation in the field. Given plenty of trained helpers, which would be the least effective?
A. one-rescuer using a bag-valve mask
B. a flow-restricted, oxygen-powered ventilation device
C. two rescuers using a bag-valve mask with high-concentration supplemental oxygen at 15 lpm
D. mouth-to-mouth with high-concentration supplemental oxygen at 15 lpm
Answer: A