What is the appropriate compression to ventilation ratio for infant CPR without an advanced airway?

In the context of infant CPR without an advanced airway, the appropriate compression to ventilation ratio is 15 compressions followed by 2 ventilations. This ratio is specifically designed for infants and is based on the physiological needs of this age group, which differ from those of older children and adults.

The reasoning behind this ratio is grounded in optimizing oxygen delivery and effective circulation during resuscitation efforts. When performing CPR on infants, it is crucial to provide enough compressions to circulate blood effectively while simultaneously ensuring adequate ventilation to address potential respiratory issues. By using 15 compressions followed by 2 breaths, rescuers can maintain a balance that supports the infant's heart rate, improves oxygenation, and increases the overall chances of successful resuscitation.

In contrast, the other options either provide an incorrect number of compressions or ventilations or follow guidelines established for older children and adults, which may not be suitable for infants. It is vital for responders to follow the established guidelines specifically designed for different age groups to maximize the chances of saving a life.