In the context of CPR, what does "30:2" refer to?

The designation "30:2" in CPR is a critical guideline that indicates the ratio of chest compressions to rescue breaths for adults and children. It specifies that for every 30 compressions administered, 2 rescue breaths should be given. This ratio is based on the understanding that high-quality chest compressions are essential for maintaining blood flow to vital organs during a cardiac arrest, while rescue breaths provide necessary oxygen to the lungs.

The emphasis on this specific ratio helps ensure that CPR is performed effectively and efficiently. It is important to maintain the correct timing and sequencing of compressions and breaths in order to maximize the chances of resuscitation. This method helps unify training and practice for responders, facilitating a standardized approach to performing CPR across various situations.

Other options do not relate to the specific mechanics of CPR. For instance, the age of the victim is not what "30:2" denotes, as the ratio applies to all adults and children regarding the technique used. Likewise, it does not indicate a time interval for effective CPR, nor does it represent the number of rescuers needed, both of which would be unrelated to the compression and breath ratio needed during the procedure.