Abstract
Cardiopulmonary resuscitation (CPR) is an important first aid technique for life saving. Even though the experiments performed on domestic swine have demonstrated that the occluded airway could also promote the efficiency of CPR, the studies using animals also have been criticized for the differences of airway mechanics between human and animals. Furthermore, because the thorax deformation determines the mechanical environment and the deformation of the organs inside the chest, the pressing location on the thorax influences the efficiency of the CPR. Therefore, this study is focused on investigating the influence of the ventilation and the thorax deformation on blood perfusion in the heart during CPR. By introducing the porous hyperelastic material model for the lung and heart and connecting the preload and afterload circuits representing the circulatory systems, we reproduced the deformation of the heart and lung accompanied with the thorax deformation. The deformation results demonstrated that the sternum is the appropriate press part of the thorax during CPR. From the results of the pleural and the cardiac chamber pressure and the volume change of the heart, it is noted that the occluded airway system may promote the blood flow in the heart during CPR.
