Final answer:
In children, the compression to ventilation ratio during CPR (cardiopulmonary resuscitation) performed by a single rescuer is 30:2.
Step-by-step explanation:
In children, the compression to ventilation ratio during CPR (cardiopulmonary resuscitation) performed by a single rescuer is 30:2. This means that for every 30 chest compressions, 2 ventilations (breaths) should be given. The rescuer should push down on the center of the chest at a rate of 100 to 120 compressions per minute, followed by giving 2 breaths by mouth-to-mouth or mouth-to-nose technique.