"The Butterfly BVM exceeded the Ambu Spur II in delivering appropriate Vts and in keeping PIPs below target maximums to simulated adult and pediatric patients...."

Tidal volumes delivered to a pediatric manikin by participants using an Ambu Spur II pediatric vs the Butterfly BVM (set to the pediatric Vt setting). The green dashed line indicates the low threshold Vt (4 ml/kg) for a patient of the stated size (2 yr old child, 12–14 kg), and each red dashed line represents the max threshold Vt (8 ml/kg) for the same. **p < 0.01, 99 % CI (278 ± 8.69) ml.

Tidal volumes delivered to an adult manikin by participants using an Ambu Spur II adult vs the Butterfly BVM. The green dashed line indicates the low, threshold Vt (4 ml/kg) for a patient of the stated size (70 kg), and the red dashed line represents, the max threshold Vt (8 ml/kg) for the same. *p < 0.01, 99 % CI (278 ± 8.69) ml.

Number of failures (out of 1880 recorded breaths) in which participants delivered a peak inspiratory pressure above the target. Of note, there were only two failures when participants used the manometer-free Butterfly BVM 

(each of which was less than 0.5cmH2O above target) in contrast to the 76 failures (and higher failure values) associated with use of the Ambu Spur II.