CPR (Cardiopulmonary Resuscitation) is an emergency lifesaving procedure performed when the heart stops beating. The scenarios could be drowning, heart attack, electrocuted, injury, or drug overdose... CPR is performed with alternating 30 time chest compressions and two mouth-to-mouth deep breaths. The compression rate should be at least 100 compressions / minute. The two rescue breaths should be performed within 5 seconds. The rescue breaths could be omitted if you don't know the victim, partic