Which action is critical when performing CPR on an adult?

Performing CPR on an adult requires a focus on high-quality chest compressions, which should be given at a rate of 100 to 120 compressions per minute. This rate is critical because it helps maintain blood circulation to vital organs during cardiac arrest, enhancing the chances of survival until emergency medical services arrive.

The importance of this compression rate stems from the need to effectively pump blood and deliver oxygen to the brain and other organs. Studies have shown that compressions at this optimal rate maximally improve perfusion and increase the likelihood of successful resuscitation efforts.

In relation to the other options, starting with rescue breaths is not prioritized in adult CPR unless the rescuer is specifically trained to perform different protocols. Using one hand for compressions is ineffective, as two hands are needed to provide sufficient force to compress the chest adequately. Checking for breathing every minute is also unproductive; the focus should remain on continuous compressions without pausing to check for breathing, as this can interrupt the vital flow of blood.

Thus, the emphasis on maintaining a rate of 100-120 compressions per minute is essential for successful CPR in adults.