心输出量、心脏指数、心脏收缩时间间期等是研究心脏生理、评价心功能和进行血液动力学监护的重要指标。过去国内外广泛采用创伤性方法(插心导管、飘浮导管),近年来均在研究用非创伤性方法取得上述数据以评价心功能。而我国儿科领域的研究尚少,未见例数较多的资料报道,我们曾应用非创伤性的心阻抗血流图 Cardiac output, cardiac index, systolic time interval is the study of cardiac physiology, cardiac function evaluation and hemodynamic monitoring of important indicators. In the past widely used at home and abroad traumatic methods (catheterization, floating catheter), in recent years are studying non-invasive methods to obtain the above data to evaluate cardiac function. However, there are still few studies on pediatric field in our country. There is no reported data on the number of cases. We used noninvasive cardiac impedance blood flow