When performing chest compressions, what should be the ratio of the depth of compressions to the frequency of compressions?

The ratio of the depth of compressions to the frequency of compressions is important for effective cardiopulmonary resuscitation (CPR), particularly when performing chest compressions. The depth of compressions should be approximately 2 to 2.4 inches (5 to 6 centimeters) for adults, while the frequency should ideally be about 100 to 120 compressions per minute.

In this context, the correct option represents the standard of conducting two compressions for every breath or two seconds of compression, emphasizing the importance of maintaining a rhythm that is both effective and manageable for the person administering CPR. This balance allows for sufficient blood flow to be maintained during the process of resuscitation while ensuring the rescuer can sustain the effort over the duration of the emergency.

The other ratios would either imply a compression pattern that is too rapid or too slow, potentially compromising the effectiveness of the compression in providing necessary blood flow to vital organs during a cardiac event. Therefore, maintaining a ratio of one breath every two compressions effectively supports the guidelines established for CPR practices.