When electrocuted, most cardiac arrests are caused by ventricular fibrillation, or ventricular fibrillation, or by respiratory arrest followed by cardiac arrest. Rescuers perform chest compressions and artificial respiration, if two people resuscitate, the ratio of children over 8 years old, adults is 30:2, that is, within 15-18 seconds, perform 30 chest compressions, the frequency of 100-120 times / min, and then mouth-to-mouth artificial respiration 2 times; under 8 years old (excluding newborns) ratio of 15:2, the frequency of compressions is also 100-120 times / min. The 15 compressions should be completed within 7.5-9 seconds. In the case of single person resuscitation, the ratio of chest compressions to artificial respiration is 30:2 for both adults and children, including infants under 1 year old (except newborns), and the 30 compressions should be completed within 15-18 seconds, or 100-120 compressions/min.