30:2
30 chest compression then 2 breaths for an adult and 15 chest compression and 1 breath for an infant or child.
30 compressions per 2 breaths for 1 rescuer adult/child/infant 15 compressions per 2 breaths for 2 rescuer child/infant
For an Adult, if there are no signs of life, immediately go to CPR. For an Infant or Child, if there is no breathing, but a pulse start rescue breathing; 1 breath every 3 seconds.
30.2
For children and infants: once every three seconds For adults: once every five seconds
The compression and ventilation ratio for a two-person rescue CPR is 15 compression and 2 breaths.
2 seconds
30/2
1 rescuer CPR for infant is 30 compressions to 1 breath.
1 breath every 3 seconds
For an adult, 2-rescuer CPR compression to breath ratio is the same as 1-rescuer; 30 compressions to 2 breaths.
Give breath over a period of 1 second.