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The CPR ratio for adults is 30:2, indicating that for every 30 compressions delivered, 2 rescue breaths should be administered. This ratio is established in guidelines to maximize the effectiveness of cardiopulmonary resuscitation (CPR). The focus on delivering a high number of compressions followed by breaths is critical because high-quality chest compressions help maintain blood flow to the brain and vital organs during cardiac arrest.

In adult CPR, the emphasis is placed on maximizing compressions to ensure that circulation is maintained while minimizing interruptions. This approach is based on evidence showing that a higher number of compressions per minute results in better outcomes for victims of cardiac arrest. The 30:2 ratio helps to strike a balance between providing adequate compressions and ensuring that oxygen is delivered through rescue breaths.