Basic Life Support (BLS) Practice Exam

What is the correct compression-to-ventilation ratio for adults if an advanced airway is not in place?

1. 15:2

2. 30:2

3. 20:2

4. 10:1

The correct answer is: 30:2

The compression-to-ventilation ratio of 30:2 is the correct ratio for adults when performing CPR without an advanced airway in place. This ratio reflects the established guidelines that recommend providing high-quality chest compressions alongside occasional rescue breaths. When performing CPR, the primary focus is to maintain blood circulation and oxygenation to vital organs. The 30:2 ratio allows for 30 chest compressions to be delivered in rapid succession, followed by two rescue breaths. This approach maximizes the effectiveness of compressions, maintaining blood flow, while also ensuring that the victim receives adequate ventilations, which is crucial when the individual is not breathing. Using this ratio helps to simplify the process for rescuers and provides a clear structure for delivering CPR, ensuring that both chest compressions and breaths are effectively integrated into the lifesaving effort. In situations where an advanced airway is not present, this ratio optimally balances the need for cardiac output with respiratory support.