Bag Valve Mask Usage Without Oxygen

Introduction to BVM Usage

A bag valve mask (BVM) can be used to deliver rescue breaths without supplemental oxygen, as the self-inflating bag delivers room air (approximately 21% oxygen) when no oxygen source is attached, which is sufficient for effective ventilation during resuscitation 1, 2, 3
The American Heart Association states that a bag-mask device provides "mask ventilation with room air or oxygen", confirming both options are viable 4

When used without oxygen, the BVM delivers approximately 21% oxygen (room air), compared to 30-80% with oxygen flow at 10 L/min, or 60-95% when an oxygen reservoir is attached 1, 2, 3
For optimal oxygen delivery (60-95%), attach an oxygen reservoir to the self-inflating bag with flow rates of 10-15 L/min for pediatric bags and at least 15 L/min for adult bags 1, 2
Effective BVM ventilation requires proper technique regardless of oxygen availability, including delivering approximately 600 mL tidal volume for adults to produce visible chest rise 4, 5, 6
Give each breath over 1 second and watch for chest rise 4, 5, 6

Two-person technique is strongly preferred: one rescuer uses both hands to maintain airway and mask seal while the other squeezes the bag 4, 5, 6
For a lone rescuer during CPR, mouth-to-barrier device techniques are preferred over single-person BVM due to the complexity of maintaining adequate seal and airway 1, 2, 3

Avoid excessive ventilation—use only enough force to make the chest visibly rise, as excessive ventilation increases intrathoracic pressure, impedes venous return, and decreases cardiac output 1, 2, 3
Never delay rescue breathing while searching for oxygen equipment—begin ventilation with room air immediately 1, 2, 3