BVM Ventilation Rate During Cardiac Arrest

General Guidelines

• The American Heart Association recommends delivering 2 breaths during a brief pause after every 30 chest compressions, with each breath given over 1 second, without an advanced airway 1, 2, 3
• The compression-to-ventilation ratio is 30:2, where 30 chest compressions are followed by a brief pause to deliver 2 breaths 1, 3, 4, 5

Technical Points

• Each breath should be delivered over approximately 1 second, with a tidal volume of approximately 500-600 mL (6-7 mL/kg), producing visible chest rise 1, 6, 7
• The pause for ventilations should be brief, about 3-4 seconds total for both breaths 8, 9
• Minimize interruptions in compressions, aiming for a chest compression fraction of at least 60% 3, 4

Critical Pitfalls

• Avoid hyperventilation, as excessive ventilation increases intrathoracic pressure, decreases venous return to the heart, and diminishes cardiac output and survival, which is a Class III recommendation (harm) 1, 6, 7

Advanced Airway

• With an advanced airway, deliver 1 breath every 6 seconds (10 breaths per minute), and chest compressions continue without pauses at a rate of at least 100 per minute 2, 3, 5
• Ventilations are asynchronous, and the optimal ventilation rate with an advanced airway remains somewhat uncertain, though 10 breaths per minute is the established standard, which is a Class IIb recommendation (may be reasonable) 5

Practical Algorithm

• Start CPR with 30 compressions: 2 breaths, and continue this ratio until an advanced airway is placed 4, 5
• Once an advanced airway is secured, switch to continuous compressions + 1 breath every 6 seconds 4
• Monitor for visible chest rise with each breath to ensure adequate volume 1, 6, 7
• Avoid excessive ventilation at all stages 1, 6, 7

Additional Context

• The evidence strongly supports that during the early minutes of sudden cardiac arrest, chest compressions are more critical than ventilations because arterial oxygen content remains adequate initially 7
• BVM ventilation is most effective with 2 providers, one to seal the mask and open the airway, and the other to squeeze the bag 2, 8, 9, 10