how many breaths do we deliver to the casualty
1 Start CPR with 30 chest compressions before checking the airway and giving rescue breaths. 2  Trained but rusty. 3  If you've previously received CPR training but you're not confident in your abilities, then just do chest compressions at a rate of about 100 a minute. Push hard at a rate of about 100 compressions a minute. 2  If you haven't been trained in CPR, continue chest compressions until there are signs of movement or until emergency medical personnel take over. 3  If you have been trained in CPR, go on to checking the airway and rescue breathing.