• Brian E Driver, Alexandra H Atkins, and Robert F Reardon.
• Department of Emergency Medicine, Hennepin County Medical Center, Minneapolis, Minnesota.
• J Emerg Med. 2020 Oct 1; 59 (4): 590-592.

BackgroundMost pediatric resuscitator bags are equipped with a positive-pressure relief ("pop-off") valve meant to prevent delivery of excessive pressure. Pop-off valves, however, can lead to adverse events in emergency situations when providers are unaware of their significance.Case ReportA 3-year-old girl with muscular atrophy and a chronic tracheostomy tube was noted to have decreasing oxygen saturations. Paramedics found the patient in cardiac arrest and initiated resuscitative efforts; the patient regained pulses but quickly became pulseless again. There were two more cycles of cardiac arrest followed by return of spontaneous circulation. When she arrived at the emergency department pulses were present. The emergency physician performed bag ventilation and felt no resistance to bag squeezing, but saw no chest rise, and realized the patient was not being ventilated because all of the air was escaping through the pop-off valve. When the valve was closed, it was impossible to perform bag ventilation. She was found to have complete occlusion of her tracheostomy tube; the paramedics had not been ventilating during transport, though were unaware of the occlusion because of the open pop-off valve. Removal of the tracheostomy tube and placement of an endotracheal tube significantly improved ventilation. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Pop-off valves are common on pediatric resuscitator bags, but often result in insufficient ventilation and oxygenation during emergency airway management. Emergency airway experts recommend that pop-off valves be avoided or deactivated during emergency resuscitation, but this information has not been widely disseminated.Copyright © 2020 Elsevier Inc. All rights reserved.

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