What is the correct compression to ventilation ratio when two providers perform CPR on a child without an advanced airway?

In the context of CPR for a child performed by two rescuers without an advanced airway, the correct compression to ventilation ratio is 15 compressions to 2 breaths. This ratio is designed to provide an effective balance between compressions, which are essential for maintaining blood circulation, and ventilations, which ensure adequate oxygenation.

The rationale behind this ratio lies in the physiological needs of children during cardiac arrest. Children's hearts can respond quite well to effective chest compressions, so rescuers are encouraged to perform a greater number of compressions within each cycle compared to adult CPR. The ratio of 15:2 allows for more frequent chest compressions, helping to maintain blood flow and circulation while still providing necessary ventilations.

The other ratios, such as 30:2 or 5:1, are not appropriate in this situation. The former is the adult CPR ratio and is too high for a child in this context. The 5:1 and 10:1 ratios do not reflect the needs for sufficient ventilations in relation to effective compressions required when performing CPR on a child.