The heart locates in the chest. When the cardiac arrest is caused by various internal and external factors, it is necessary to establish an artificial circulation for the heart, including external compression. But when the integrity of the chest is destroyed, the "home" of the chest cannot effectively carry out high-quality cardiopulmonary resuscitation (CPR). The abdomen not only possesses 1/4 body blood volume, but also is the abdominal respiratory basis mainly through diaphragm. Through the "abdominal pump" mechanism, intrathoracic pressure is changed by moving the diaphragm up and down, and then exert the effect of indirect "chest pump", "heart pump" and "lung pump". So by using abdomen as the second "home", the purpose of establishing artificial circulation and respiration can be successfully achieved.