Should you pump their chest or give mouth to mouth?

Answer 1

It depends, if you pump their chest it gets their heart beating, whereas mouth to mouth helps them to breathe.

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If the person has had heart failure, then you should do both--the current Red Cross guidelines are thirty chest pumps to two rescue breaths. If the person's heart has stopped, then they aren't going to be breathing, but if you can feel a heartbeat and they aren't breathing, then you should give mouth-to-mouth.