Tronstad Christian, Høgetveit Jan Olav, Elvebakk Ole, Kalvøy Håvard
Department of Clinical and Biomedical Engineering, Oslo University Hospital, Oslo, Norway.
Department of Physics, University of Oslo, Oslo. Norway.
J Electr Bioimpedance. 2019 Dec 31;10(1):139-145. doi: 10.2478/joeb-2019-0020. eCollection 2019 Jan.
Impedance cardiography (ICG) is a non-invasive method of hemodynamic measurement, mostly known for estimation of stroke volume and cardiac output based on characteristic features of the signal. Compared with electrocardiography, the knowledge on the morphology of the ICG signal is scarce, especially with respect to age-dependent changes in ICG waveforms. Based on recordings from ten younger (20-29 years) and ten older (60-79) healthy human subjects after three different levels of physical activity, the typical interbeat ICG waveforms were derived based on ensemble averages. Comparison of these waveforms between the age groups indicates the following differences: a later initial upward deflection for the younger group, an additional hump in the waveform from many older subjects not presented in the younger group, and a more pronounced second wave in the younger group. The explanation for these differences is not clear, but may be related to arterial stiffness. Further studies are suggested to determine whether these morphological differences have clinical value.
阻抗心动图（ICG）是一种非侵入性血流动力学测量方法，主要以基于信号特征估计每搏输出量和心输出量而闻名。与心电图相比，关于ICG信号形态的知识较少，尤其是关于ICG波形随年龄变化的情况。基于对10名年轻（20 - 29岁）和10名年长（60 - 79岁）健康人类受试者在三种不同体力活动水平后的记录，通过总体平均值得出典型的心动周期ICG波形。年龄组之间这些波形的比较显示出以下差异：年轻组初始向上偏转较晚，许多年长受试者波形中存在年轻组未出现的额外波峰，以及年轻组中第二个波更明显。这些差异的原因尚不清楚，但可能与动脉僵硬度有关。建议进一步研究以确定这些形态差异是否具有临床价值。
