What is the recommended compression-to-breath ratio for adult CPR by trained rescuers?

The recommended compression-to-breath ratio for adult CPR performed by trained rescuers is 30:2. This means that for every 30 chest compressions administered, the rescuer should provide 2 rescue breaths. This ratio is based on current guidelines which emphasize the importance of high-quality chest compressions in maintaining blood flow during cardiac arrest.

The rationale behind this 30:2 ratio is to maximize the effectiveness of chest compressions, ensuring that adequate blood circulation is maintained while also providing breaths to oxygenate the blood. The focus on 30 compressions before giving breaths allows for a more consistent rhythm, which can enhance the effectiveness of cardiac compressions.

In this context, the other ratios provided do not align with the established guidelines. For instance, a 15:2 ratio is outdated and not recommended, as it interrupts compressions too frequently with breaths, thereby reducing the total number of compressions delivered in a given time frame. Similarly, 10:2 and 30:1 ratios do not provide the optimal balance of compressions and ventilations necessary for successful resuscitation efforts in adults. The clear choice of 30:2 ensures that rescuers can deliver the best possible care in a critical situation.