What is the recommended rescue-breaths protocol after 30 chest compressions in adult CPR?

• A. 3 rescue breaths after every 30 compressions.
• B. 2 rescue breaths after every 30 compressions.
• C. 1 rescue breath after every compression.
• D. 2 rescue breaths after every compression.

Answer: (B)

During adult CPR, ventilation is timed to follow a full cycle of chest compressions. After you complete a standard set of compressions, deliver a brief rescue-breath sequence to oxygenate, then immediately resume compressions. This cadence maintains perfusion from the compressions while providing enough ventilation to prevent hypoxia without causing excessive air in the stomach or increased intrathoracic pressure that can hinder blood return. Ensure each breath makes the chest rise and is delivered smoothly, then continue the cycle.

Intermittent or excessive ventilation disrupts circulation or causes overventilation, which is why this balanced approach after each compression sequence is recommended.