Kosicki J, Chen L H, Hobbie R, Patterson R, Ackerman E
Ann Biomed Eng. 1986;14(1):67-80. doi: 10.1007/BF02364649.
We have developed a cylindrically symmetric model with which to study what physiologic variables might contribute to the impedance cardiogram signal. We find the major contributions in this model to be due to dilation of the aorta and carotid arteries, changes in conductivity of blood in these same vessels due to red cell reorientation during flow, changes in the conductivity of the lungs, and changes in heart volume. The calculations suggest that the popular equation used to determine stroke volume from thoracic impedance data is not accurate under all conditions of the circulatory system.
我们已经开发出一种轴对称模型，用以研究哪些生理变量可能对阻抗心动图信号有贡献。我们发现该模型中的主要贡献来自于主动脉和颈动脉的扩张、这些血管中由于血流过程中红细胞重新定向导致的血液电导率变化、肺电导率的变化以及心脏容积的变化。计算结果表明，用于根据胸部阻抗数据确定每搏输出量的常用公式在循环系统的所有条件下并不准确。
