What is the correct ratio of chest compressions to breaths in single-rescuer CPR?

In single-rescuer CPR, the established ratio of chest compressions to breaths is 30:2. This means that for every 30 chest compressions delivered, the rescuer should provide 2 breaths. This ratio is designed to maximize the effectiveness of CPR by maintaining adequate circulation through high-quality chest compressions while also ensuring that the victim receives necessary breaths to oxygenate their blood.

The emphasis on delivering 30 compressions first is crucial for maintaining blood flow, as it helps to keep the heart pumping and vital organs supplied with oxygenated blood before introducing breaths. Following the 30 compressions with 2 breaths allows for a brief but critical moment to provide air to the lungs.

Understanding this ratio is key for effective CPR, as it balances the need for perfusion (via compressions) with the need for oxygenation (via breaths), contributing to better outcomes in cases of cardiac arrest.