In reply to JohnV:
> For the school I work at in Peru...
What is the ambulance service/ Emergency Department/ ITU services in Peru?
The outcomes of pre hospital cardiac arrest (and therefore lay person CPR) are fairly diabolical in the developed world (off the top off my head i think a large scale Japanese study had a 2% survival with meaningful quality of life, seen other studies with 3-4%).
Without rapid back-up from qualified staff and facilities with suitable ongoing care it is a pointless and possibly traumatic activity for the rescuer. Maybe it would be wiser to focus on teaching first aid that could be of benefit....choking, bleeding, reducing risk of infection in wounds etc.