If someone collapses, is unresponsive and is not breathing normally, start chest compressions and have someone call 120 and find an AED
The person you help is likely to be family: 79.2% of arrests in the cited Chinese registry occurred at home. With bystander CPR, survival to discharge rose from 3.9% to 16.1% in the pooled research. If the person is unresponsive and is not breathing normally, start compressions in the middle of the chest, 5–6 cm deep at 100–120 per minute. Have a second person call China's 120 and fetch an AED while you continue.