目前,国内外对于肺阻抗容积图的研究工作日益增多,普遍认为它是体外观测小循环功能的简便而无损伤的方法之一。肺阻抗容积图简称肺电阻图,又名肺血流图,亦称为肺血容图。它是通过肺阻抗变化以反映肺血容量(积)改变的曲线描记图。胸部总阻抗随肺血容量和肺气量变化而显示其改变,故如肺气量保持相对恒定(即屏气情况下),则肺血容量(积)的改变即成为胸部总阻抗变化的决定因素。在心动周期中,右心室收缩,肺血流量增加,电阻减小,心室舒张则肺静脉血流入左心,肺血流量减少,电阻 At present, the research work on the lung impedance volumetric graph has been increasing both at home and abroad, and it is generally considered as one of the simple and nondestructive methods for observing the function of small circulation in vitro. Lung impedance volume chart referred to as lung resistance map, also known as pulmonary blood flow diagram, also known as lung blood map. It is a trace of the changes in lung impedance reflecting changes in lung volume (product). The total chest impedance changes with the lung volume and lung volume changes show, so if the lung volume remains relatively constant (ie breath-hold situation), then the change in lung volume (product) becomes a determinant of the total chest impedance changes. In the cardiac cycle, right ventricular systole, increased pulmonary blood flow, decreased resistance, ventricular diastolic pulmonary venous blood flow into the left heart, decreased pulmonary blood flow, resistance