What is the correct compression-to-breath ratio for adult CPR?

The correct compression-to-breath ratio for adult CPR is 30 compressions to 2 breaths. This ratio is established to provide effective and efficient chest compressions while also allowing for sufficient ventilation in a time-efficient manner.

In adult CPR, the emphasis is primarily on high-quality chest compressions, as they are critical for maintaining blood flow to the heart and brain during cardiac arrest. The ratio of 30:2 helps to ensure that the victim receives adequate oxygenation through rescue breaths while still allowing a significant number of compressions to circulate blood effectively. This method is endorsed by most CPR guidelines and is used to both maximize the likelihood of survival and minimize interruptions in compressions, which are essential for re-establishing circulation.

The other ratios presented would either not provide enough compressions, leading to inadequate perfusion, or would disrupt the balance necessary for optimal CPR effectiveness. Thus, the 30:2 ratio is the standard practice for adult victims in need of resuscitation.