What is the ratio of compressions to breaths in CPR for adults?

The standard ratio of compressions to breaths in CPR for adults is 30:2. This means that for every 30 chest compressions given, two rescue breaths should be administered. This ratio is designed to provide adequate circulation of blood and oxygen to the brain and vital organs during a cardiac arrest scenario.

The reasoning behind using this specific ratio is based on the goal of maximizing blood flow and maintaining oxygenation while minimizing interruptions in chest compressions. High-quality compressions are critical as they help to maintain coronary and cerebral perfusion pressure, increasing the chances of survival until advanced medical help arrives. By using the 30:2 ratio, rescuers can maintain a rhythm that is effective in delivering both compressions and ventilations, optimizing the overall effectiveness of CPR.

The other options reflect ratios that are not recommended for adult CPR, as they do not adhere to the established guidelines which were designed based on evidence from studies that aimed to optimize patient outcomes in cardiac arrest situations.