In Adult Multiple-Rescuer CPR, what is the correct ratio of compressions to breaths?

In Adult Multiple-Rescuer CPR, the correct ratio of chest compressions to rescue breaths is 30 compressions followed by 2 breaths. This ratio is established to maximize the effectiveness of CPR in adults and to ensure that oxygen is supplied to the lungs efficiently.

The 30:2 ratio allows for a rapid return to chest compressions, which are critical for maintaining circulation and blood flow to vital organs during cardiac arrest. By focusing on compressions first, rescuers can provide the necessary blood flow while minimizing the time without compressions during the rescue breaths. This practice aligns with current guidelines issued by major health organizations that emphasize high-quality CPR, which prioritizes effective compressions to maintain the victim's chances of survival.

The other ratios presented do not align with established CPR protocols for adults; therefore, they would not provide the same efficacy in a life-threatening scenario.