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

The correct compression-to-ventilation ratio for adult CPR is 30 compressions to 2 breaths. This ratio is established based on guidelines that aim to maximize the effectiveness of CPR. During adult cardiac arrest, the emphasis is placed on providing high-quality chest compressions to maintain blood circulation, while ventilations are administered to oxygenate the blood. The 30-to-2 ratio strikes an appropriate balance between compressions and breaths, ensuring that sufficient time is dedicated to compressions, which are vital for maintaining blood flow to the vital organs. This ratio is applicable in most adult scenarios, particularly when a single rescuer is performing CPR. In situations involving multiple rescuers or specific cases like pediatric patients, different ratios may be recommended, but for adults, 30 compressions followed by 2 ventilations is the standard practice.