What is the correct compression-to-breath ratio for a single rescuer performing CPR on an adult?

The correct compression-to-breath ratio for a single rescuer performing CPR on an adult is 30 compressions followed by 2 breaths. This ratio is based on the guidelines provided by the American Heart Association, which emphasize that high-quality chest compressions should be the priority in adult resuscitation efforts.

In this approach, delivering 30 compressions helps to circulate blood more effectively, while the subsequent 2 breaths ensure that oxygen is being delivered to the lungs, improving the chances of successful resuscitation. This 30:2 ratio facilitates a quicker and more efficient cycle of compressions and ventilations, maximizing the chances of maintaining blood flow to vital organs and minimizing interruptions in compressions, which are essential for keeping the heart and brain perfused.

The other ratios mentioned do not align with the current resuscitation guidelines for adult patients since they either offer too few compressions before breaths or are not balanced in a way that optimizes the overall effectiveness of CPR in an adult setting.