This paper derived a non-Linear function relationship between the cardiac impedance plethysmogram and the heart ejection by researching differential equation of the aortic volume change.
本文通过研究主动脉容积变化微分方程，导出了心阻抗图与心脏射血的非线性函数关系。
2
Ejection fraction(EF) and cardiac output(CO) of patients in the 3 groups were evaluated before, 4 and 8 weeks after operation respectively.
分别对3组患者术前、术后4周、8周心脏射血分数（EF）及心输出量（CO）进行观察。
3
The correlations of serum level of C reactive protein with grade of cardiac function, cardiac anatomic indexes and left ventricular ejection fraction were analyzed.