What is the recommended compression-to-breath ratio for adult CPR without advanced airway?

For adult CPR without an advanced airway, the recommended compression-to-breath ratio is 30:2. This ratio means that for every 30 chest compressions administered, 2 rescue breaths are provided. This guideline is based on evidence that shows this ratio allows for the most effective circulation and oxygenation for adults in cardiac arrest.

During CPR, the priority is to maintain blood flow to vital organs, especially the brain and heart, through high-quality chest compressions. The 30:2 ratio balances the need for uninterrupted compressions while also providing occasional breaths to supply oxygen to the lungs. Having a standardized ratio helps ensure that rescuers can deliver consistent and effective care, which is crucial in an emergency situation.

Other ratios, such as 15:1, 20:1, and 40:2, do not align with current guidelines for adult CPR and would not provide optimal outcomes in a cardiac arrest situation when an advanced airway is not in place.