What is the ratio of compressions to breaths for an adult during CPR?

The correct answer is 30:2, which reflects the current guidelines for performing CPR on adults. This ratio indicates that for every 30 chest compressions administered, two rescue breaths should be given. This approach is designed to maximize blood flow to vital organs while also providing the necessary oxygenation.

Maintaining a 30:2 ratio during CPR is critical because it ensures that the rescuer can sufficiently circulate blood while minimizing interruptions. The emphasis on this specific ratio has evolved over the years as research into cardiac arrest response has progressed, recognizing the importance of compressions in maintaining circulation.

In practice, this means that rescuers should focus on delivering high-quality chest compressions at a rate of about 100-120 compressions per minute, pausing only briefly to give the two breaths. This combination balances the need for both effective compressions and the provision of oxygen, which is essential for improving the chances of survival in a cardiac arrest scenario.