What is the compression-to-ventilation ratio for adults in the Basic Life Support (BLS) for a single rescuer?

In Basic Life Support (BLS) for adults, the compression-to-ventilation ratio for a single rescuer is 30:2. This means that after delivering 30 chest compressions, the rescuer should provide 2 rescue breaths. This ratio is established to effectively maintain circulation and oxygenation during cardiac arrest.

The rationale behind this specific ratio lies in the need to prioritize chest compressions, which are crucial for maintaining blood flow to vital organs during resuscitation. The 30 compressions help facilitate adequate circulation, while the 2 rescue breaths ensure that the patient receives necessary oxygen.

This structured approach is vital as it allows for an organized and efficient method of performing CPR, increasing the chances of survival and recovery for the patient experiencing cardiac arrest. Other potential ratios would not align with the BLS guidelines established for single-rescuer adult CPR and may not provide optimal blood flow and oxygenation during critical moments of resuscitation.